Physics Homework Questions & Answers Archive

The length of the Achilles tendon increases 0.500 cm when the force exerted on it by the muscle increases from 3214 N to 4784 N. How much work is done by the muscle in stretching the tendon?

Trial Exp v1f (m / s) Acc V1f (m / s) % Error Exp v2f (m / s) Acc v2f (m / s) % Error ml=m 2 1.00 2.00 0 0 ml>m 2 2.00 2.00 0 0 m 1<m 2 1.00 1.00 N/A N/A

In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6964 subjects randomly selected from an online group involved with ears. There were 1299 surveys returned. Use a 0.01 significance level to test the claim that the return rate is less than 20%. Use the P-value method and use the normal distribution as an approximation to the binomial distribution. H0: p=0.2 H1: p<0.2 The test statistic is z=-2.81

b. What is the de Broglie wavelength of the electron striking the Cu surface?

Question 7 2 pts A sample of n=25 scores produces a t statistic of t=2.062. If the researcher is using a two-tailed test, then which of the following is the correct statistical decision? It is impossible to make a decision about H0 without more information. The researcher can reject the null hypothesis with either α=.05 or α=.01. The researcher can reject the null hypothesis with α=.05 but not with α=.01. The researcher must fail to reject the null hypothesis with either α=.05 or α=.01. Question 8 2 pts A sample is selected from a population with μ=46 and a treatment is administered to the sample. After treatment, the sample mean is M=48 with a sample variance of s^2=16. Based on this information, the size of the treatment effect, as measured by Cohen's d , is . d=0.125 d=0.001 d=0.25 d=0.50

How long can volcanic ash remain in the stratosphere? A. Days B. Months C. Weeks D. Years

Identify the forces acting on the football: A football is moving upward and rightward towards the peak of its trajectory. Ignore air resistance.

The mass of a radioactive substance follows a continuous exponential decay model. A sample of this radioactive substance has an initial mass of 167 kg and decreases continuously at a relative rate of 8% per day. Find the mass of the sample after six days. Do not round any intermediate computations, and round your answer to the nearest tenth.

Find the volume of the figure. H=8 ft 3 ft 7 ft The volume of the figure is (Round to the nearest whole number as needed.)

Use the substitution method to solve the system of equations. Choose the correct ordered pair. x+y=5 y=7 A. (-2,7) B. (2,7) C. (-12,7) D. (12,7)

Question 5 of 10 Which side of triangle XYZ is the longest? A. XY B. xz C. sqrt(2) D. Cannot be determined

When designing for best bias stability the configuration should be chosen. Select one: A. collector-feedback bias B. emitter-feedback bias C. fixed-bias D. voltage-divider bias

Wavelength - The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength is associated with this frequency? (Assume the speed of sound to be 340 m / s.) A) 1.7 cm B) 5.2 cm C) 34 cm D) 55 cm

Which planet do most known extrasolar planets most resemble? A. Mercury B. Mars C. Neptune D. Earth

Question 1 Multiple Choice Sound waves - Which of the following ranges corresponds to the longest wavelengths? - A) infrasonic - B) audible - C) ultrasonic - D) all have the same wavelengths

If A=-3+5i, B=4-2i, and C=1+6i, where i is the imaginary unit, then A-BC equals: 1) 5-17i (-3+5i)-(4-2i)(1+6i) 2) 5+27i 3) -19-17i 4) -19+27i

Question 5 2 pts Which of the following thermodynamic quantities are NOT state functions: heat (q), work (w), enthalpy change (ΔH), and/or internal energy change (ΔU)? q only w only ΔH q and w ΔH and ΔU

Question 13 The three components of total energy expenditure include? A. Basal metabolic rate, physical activity, and adaptive thermogenesis B. Basal metabolic rate, physical activity, and the thermic effect of food C. Basal metabolic rate, the thermic effect of food, and adaptive thermogenesis D. Basal metabolic rate, physical activity, and sleep activity

Which of the following graphs (A,B,C,D) correctly represents the relationship between the pressure and the volume of an ideal gas that is held at constant temperature?

Cantaloupe, radii 4 and 6, 30 degree slice. 4 ≤ ρ ≤ 6 0 ≤ φ ≤ π 0 ≤ θ ≤ π/6 √(16-r^2) ≤ z ≤ √(36-r^2) 4 ≤ r ≤ 6 0 ≤ θ ≤ π/6 4 ≤ z ≤ 6 0 ≤ φ ≤ π/2 0 ≤ θ ≤ π/6

Expand: [ ln left[fracsqrt[3]x-1(3 x-2)^4(x+1) sqrtx-1right]^2 2 ]

Problem C. 6 (3.3-111) Find the length of the curve r(t) = ⟨√2 t, e^t, e^−t⟩ over the interval 0 ≤ t ≤ 1.

A businessman dropped a coin from the top floor of his office building and it fell according to the formula S(t)=-16 t^2+10 t^0.5, where t is the time in seconds and S(t) is the distance in feet from the top of the building. What was the instantaneous velocity at t=1.1 seconds? Round your answer to 2 decimal places.

The radioactive decay of T1-206 to Pb-206 has a half-life of 4.2 s. Starting with 6.4 x 10^12 atoms, how many will remain after 12.6 s? 1.6 x 10^12 8.0 x 10^11 4.0 x 10^11 3.2 x 10^12

Draft is the movement of combustion air into the boiler furnace for combustion and carries the spent gasses (flue gas) out of the boiler furnace.

Each sketch shows three objects with an electric charge. In each case, decide whether the net force on the object outlined in green is to the left, or to the right, or if there is no net force acting on the object outlined in green. There is a net force acting on the object outlined in green. For example, if there is a net force pushing the green object to the left, select the left arrow. If there is no net force on the green object in that sketch, select the middle button under the second sketch. Select the right arrow under the third sketch if there is a net force pushing the green object to the right.

An airplane circles the airport at a speed of 800 km/h. The radius of the arc is 500 m. Find the rotational speed (in rad/hr) of the aircraft.

Wave Length (m),Speed (m/s),100,14.6 125,13.6 130,16.1 175,17 210,21.8 350,24.3 400,24.9 Using the equation from part (a), estimate the speed (in meters per second) of a wave that is 200 m long. (Round your answer to one decimal place.) v = Find the equation of a linear regression line for the data above. (Round your answer to three decimal places.) y = mx + b

Solve the system of equations by using the addition method. 2x - 18y = 10 6x + 29y = 30 The solution set is .

Verify each identity. 1. (tan^2 x+1)(cos^2 x-1)=-tan^2 x

Write the vector **v** in the form **a i**+**b j**, where **v** has the given magnitude and direction v=14, θ=150° v=

Question 4 of 20 View Policies Show Attempt History Current Attempt in Progress * Your answer is incorrect. Under a perpetual inventory system, acquisition of merchandise for resale is debited to the Supplies account. the Purchases account. the Inventory account. the Cost of Goods Sold account. Save for Later Attempts: 1 of

The biggest risk from snow squalls is (A) quickly rising temperatures. (B) limited visibility on roads. (C) long-lasting snow storms. (D) smaller amounts of accumulating snow.

Use matrices A=[[-1 2] [4 7]], B=[[1 4 -2] [4 -5 0]] and C=[[1 0 -1] [4 0 3] [2 -1 2]] to find AB+BC. AB+BC= (Type an integer or simplified fraction for each matrix element.)

Question 2 When deciding whether to use a pooled or non-pooled T procedure for testing a hypothesis about two population means, one has to check whether the populations variances can be assumed to be equal or not. However, it can't be done just by looking at the sample variances. Although the sample variances may not appear to be exactly the same it can be due to the sampling error. We want to statistically check the claim whether the variances are the same or not. To check this claim, the two-tail F-test for two variances was setup and the p-value was calculated to be 0.007. Interpret the results using the significance level of 1% and decide whether to use a pooled or non-pooled T procedure to test a claim about the population means. Under 1% significance level, there is Select an answer 0 to suggest that the two populations have different variances, therefore, to test a claim about the population means we would use the T Select an answer 0 procedure.

Use the Laplace transform to solve the given initial-value problem. y'+5y=e^(3t), y(0)=2 y(t)=□

A large orb spider has a mass of 0.70 grams. With its silk webbing (mass density = 0.250 g / m ) which has a diameter of 0.0023 millimeters, the spider lowers itself down from a fix point on a tall tree branch, stopping and hanging 1.5 meters below the branch. If a bird lands on the branch above the spider creating a vibration, how long will it take for the spider to feel the vibration? 0.29 s 1.7 s 0.87 s 5.2 s 0.0068 s

If the plot below represents a simple harmonic oscillator's position versus time, Plot [Select] represents the velocity of the oscillator, and Plot [Select] represents the acceleration of the oscillator.

UAM Acceleration Problems Always show your work ... and don't forget units 1. An object starts at an initial velocity of +6.0 m / s and accelerates at a rate of +3.0 m / s / s for 4 seconds. a) Fill out the data table to the right, showing the instantaneous velocity for each second. b) Complete a numerically accurate (quantitative) instantaneous velocity vs. clock reading graph. c) Recalling that displacement is the area under the V vs. t graph, calculate the displacement of the object during the 4 seconds of elapsed time. Clearly show your calculations units. d) A student wants to calculate displacement by using d=vt=(6 m / s)(4 s). What's wrong with this approach? Clock Reading (s) Velocity (m / s) 0 +6.0 m / s 1 +4.0 m / s 2 +12.0 m / s 3 +15.0 m / s 4 +18.0 m / s 2. A car initially moving at +10.0 m / s constantly accelerates at a rate of -2.0 m / s^2 until it stops. a) Fill out the data table to the right to determine how much time it will take the car to stop. b) Complete a quantitative instantaneous velocity vs. clock reading graph. c) Use the graph to determine the displacement of the object during the entire motion. Show your calculations units. d) Determine the displacement during each second individually. Check to see that all of these sum up to the total displacement calculated in c ). 0-1 sec 1-2 sec 2-3 sec 3-4 sec 4-5 sec 0-5 sec

1. MET stands for the metabolic equivalent of task, which accounts for the energy consumption per kg per hour. How much is one MET equal to? ( 5 pts )

Find the area of the indicated region under the standard normal curve.

Which of the following electromagnetic waves has the lowest energy? microwaves gamma visible light infrared

Problem 8: (11% of Assignment Value) A uniform beam of length L=2.7 m and mass M=39 kg has its lower end fixed to pivot at a point P on the floor, making an angle θ=17° as shown in the diagram. A horizontal cable is attached at its upper end B to a point A on a wall. A box of the same mass M as the beam is suspended from a rope that is attached to the beam one-fourth L from its upper end. Part (a) What is the y-component Py of the force, in newtons, exerted by the pivot on the beam? Py=

The balloon (including the helium within it) and the instruments it carries is 25.0 kg. The density of air at ground level is 1.29 kg / m^3. (a) What is the magnitude of the buoyant force (in N) acting on the balloon, just after it is released from ground level? 629.8 What is the definition of the buoyant force? How does it depend on volume? What fluid is displaced by the balloon?

The students drew a fee-body force diagram to represent the force acting on the marble after it had fallen 0.2 m in trial 1, as shown. Assume air resistance was negligible. Which of the following free-body force diagrams represents the force or forces acting on the marble after it had fallen 0.4 m?

Consider the following project. Activity Predecessor(s) Duration (days) A - 4 B - 3 C A, B 5 D B 4 E C 4 F D, E 7 G E 6 H F, G 4 I D 9 J G, I 6 Develop the project schedule using the critical path method, indicating the early start, early finish, late start, late finish, and slack for each activity. What is the project duration, and which activities are critical? As a hint, note that both activities A and B have no predecessor activities, and both activities H and J have no successor activities. You do not need to draw the project network diagram.

If (f) is the focal length of a convex lens and an object is placed at a distance (p) from the lens, then its image will be at a distance (q) from the lens, where (f, p), and (q) are related by the lens equation [ frac1f=frac1p+frac1q ] What is the rate of change of (p) with respect to (q) if (q=3) and (f=8) ? (Make sure you have the correct sign for the rate.)

Given the graph: What is the least number of edges that must be duplicated to eulerize the graph? (Type the number into the space provided)

As the boy rubbed against the slide, some electrons transferred from his body to the slide. This left the boy with a net charge. - Now all of the boy's hairs have charges, so they each other.

Which of the following is NOT a component of the microprocessor? RAM registers ALU control unit

Which of the following has the lowest low tides? Neap tides Spring tides Diurnal tides Mixed tides

Using the technique outlined above, find the latitude for the following location: Location 2 - Northern Hemisphere, May 20 Note: Input your answer replacing the degree character with "d" (Ex, 89dN) Note 2: Remember to input N, S, E, or W at the end of the coordinates, it is common practice to do this (the only exception is 0 degrees, it would be notated as just "0d"). Note 3: There are only degrees, do not include minutes, input decimals instead (Ex. 11.5d N).

The change in an object's velocity depends upon of the exerted force.

Which of Galileo's beliefs was one of the main causes of his conflict with the Catholic Church? A. that the teachings of the Catholic Church were unscientific and incorrect B. that the Sun was not the center of the universe but rather orbited around the Earth C. that the pope had no authority and no right to be the head of the Catholic Church D. that the Earth was not the center of the universe but rather orbited around the Sun

What are the exact values of sin θ, cos θ, and tan θ for an angle θ in standard position terminating at point P(2,-12)?

Select the relation that properly connects the density (p) of a gas with its molecular weight (MW) in the ideal gas law.

A helicopter hovers 1150 feet above a small island. The figure shows that the angle of depression from the helicopter to point P is 41°. How far off the coast is the island? The island is off the coast. (Round to the nearest whole number as needed.)

Does a population have to be normally distributed in order to use the chi-square distribution? Choose the correct answer below. A. No, the population can have any distribution to use the chi-square distribution. B. Yes, in order to use the chi-square distribution, the population must be normally distributed. C. No, in order to use the chi-square distribution, the population must have a standard normal distribution. D. No, in order to use the chi-square distribution, the population must be exponentially distributed.

A 3050 kg cannon is mounted so that it can recoil only in the horizontal direction. (a) Calculate its recoil velocity in m / s when it fires a 15.0 kg shell at 480 m / s at an angle of 20.0° above the horizontal. (Enter the magnitude.) 2.217 m / s (b) What is the kinetic energy of the cannon in J? This energy is dissipated as heat transfer in shock absorbers that stop its recoil. (c) What happens to the vertical component of momentum that is imparted to the cannon when it is fired? Transferred to the ground

Multiple Choice Question Identify the correct equation that represents the principle of work and energy for a rigid body. U1+2=T1-T2 U1+2=T1/T2 T1+U1-2=T2 U1-2=T1+T2

Electric Currents are measured in Volts Amperes Ohms

If f''(x) = x(x+1)(x-2)^2, then the graph of f has inflection points when x= ? (A) -1 only (B) -1 and 0 only (C) -1 and 2 only (D) -1, 0, 2 only

65. A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 4.3 km apart, to be 32° and 56°, as shown in Figure 33. Find the distance of the plane from point A to the nearest tenth of a kilometer.

Which is the equation for an object's potential energy? (1 point) PE = 1/2 mgh PE = 2mgh PE = mg^2h PE = mgh

19. A gas at 300 K had its pressure changed from of 0.8 atm to 0.5 atm . If the volume is held constant, what will be the new temperature of the gas?

Compare the distance traveled in 2.86 s as a given sound moves through the following mediums. A steel rail The velocity of sound in a steel rail is vrail = 5940 m / s.

Use the figure to the right, which shows the percentages of adults from several countries who favor building new nuclear power plants in their country. The survey included random samples of 1004 adults from Country A, 1068 adults from Country B, 1123 adults from Country C, and 1010 adults from Country D. At α=0.09, can you reject the claim that the proportion of adults in Country A who favor building new nuclear power plants in their country is the same as the proportion of adults from Country B who favor building new nuclear power plants in their country? Assume the random samples are independent. Identify the claim and state H0 and Ha. The claim is "the proportion of adults in Country A who favor building new nuclear power plants in their country is the proportion of adults from Country B who favor building new nuclear power plants in their country."

Plot the complex number on the complex plane and write it in polar form and in exponential form. 11 i

Determine the magnetic field strength acting on a positron travelling at 7.31 x 10^7 m / s that experiences a magnetic force of 5.38 x 10^-13 N.

Question 13 (1 point) A transducer is an electromechanical device that is constructed of a coil of wire supported by light springs displacement oscillator accelerometer velocity Question 14 (1 point) Displacement, velocity, and ? are all direct measures of the severity of machine vibration. speed acceleration weight misalignment

A soccer ball is kicked vertically into the air with an initial velocity of 17.3 m / s. How long will it take for the ball to reach its highest point? Hint: vf=vi+a * t

b) Qual a constante elástica dessa fita?

2. Which of the following is a key advantage of a food truck - A. High initial investment - B. Mobility and flexibility - C. Limited menu options - D. High operational costs

Energy from the Sun arrives at the top of the Earth's atmosphere with an intensity of 1.36 kW/m^2. How long t does it take for 1.75 × 10^9 J to arrive on an area of 4.75 m^2. t= S

Graph y=f(x), where f(x)=3x-2.

A bicyclist is stopped at the entrance to a valley, as sketched below: Where would the bicyclist have the highest potential energy? (choose one) Where would the bicyclist have the lowest potential energy? (choose one) Where would the bicyclist have the highest kinetic energy? (choose one) Where would the bicyclist have the highest speed? (choose one) Would the bicyclist's kinetic energy be higher at B or A? (choose one) Would the bicyclist's potential energy be higher at B or A? (choose one) Would the bicyclist's total energy be higher at B or A? (choose one) Suppose the bicyclist lets off the brakes and coasts down into the valley without pedaling. Even if there is no friction or air resistance to slow him down, what is the farthest point the bicyclist could reach without pedaling? (choose one)

Deja graphed the line below. Which equation could represent Deja's graph? a. y=4x-3 b. y=-3x+4 c. y=-5x d. y=-2x-1

For problems 1-6 evaluate the given limit. 1. lim t -> 0 (cos(2t)i - e^(4-t)j + (t^2 + 3t - 9)k) 2. lim t -> 4 <(t-4)/(t^2 - 3t - 4), (t^2 - 4t)/(16 - t^2)> 3. lim t -> 0 <sin(t)/(2t), (1 - cos(t))/t, -3> 4. lim t -> -8 ((e^(t^2 - 64) - 1)/(t + 8)i + sin(t + 8)/(t + 8)j - k) 5. lim t -> -∞ <(5t^2 - 8t + 1)/(12 + 5t^2), (2 + t^3)/(1 + t^2 + t^4)> 6. lim t -> ∞ <ln(1 - 4/t), e^(1/t^2), 2>

Show that for any two nonzero vectors A and B in any number D of euclidean spatial dimensions, the magnitude of their sum C=A+B is maximum when the two vectors are parallel and minimum when they are anti-parallel.

Now, consider the light boat runs ashore on a sand covered coral reef that has a 5 degree incline. Using energy considerations, calculate the distance the 8,000 kg light boat slides, given that its initial speed is 6.00 m / s and the force of friction acting between the ship and the sand is a constant 450 N. 24 m 20 m 22 m 17 m

What method has been used to determine the most recent time the Tharsis volcanoes on Mars have erupted?

Evaluate each of the following limits: xi) lim x→2 (x-2)/(x-2) xii) lim x→3/2 (2x^2-3x)/2x-3.

A trigonometry student stands 15 meters from a building and measures the angle of elevation to the top of the building as 30°. How accurate does her angle measurement have to be if she wants her propagated percentage error in estimating the height of the building to be no more than 4%? Round any intermediate calculations to no less than six decimal places, and round your final answer to two decimal places.

Consider the new position vs. time graph below for cyclists A and B. a. How does the motion of the cyclist A in the new graph compare to that of A in the previous graph? b. How does the motion of cyclist B in the new graph compare to that of B in the previous graph? c. Which cyclist has the greater speed? How do you know? d. Describe what is happening at the intersection of lines A and B. e. Which cyclist traveled a greater distance during the first 5 seconds? How do you know?

Solve the application problem. The volume V of an ideal gas varies directly with the temperature T and inversely with the pressure P. A cylinder contains oxygen at a temperature of 320 degrees K and a pressure of 17 atmospheres in a volume of 140 liters. Find the pressure if the volume is decreased to 130 liters and the temperature is increased to 340 degrees K. (Round your answer to one decimal place.) 19.3 x atmospheres

Free-body diagrams for four situations are shown below. The net force is known for each situation. However, the magnitudes of a few of the individual forces are not known. Analyze each situation individually and determine the magnitude of Force G.

Module 4 Test Question 4 of 14 (2 points) Question Attempt: 1 of 1 Taylor Outcome Yellow Red Blue Number of Spins 29 6 5 Answer the following. Round your answers to the nearest thousandths. (a) From Rachel's results, compute the experimental probability of landing on blue or red.

Exercice ° 1 Données: Célérité de propagation de la lumière dans le vide : C=3.10^8 m · s^-1; On réalise l'expérience de la diffraction de la lumière à d'une source laser monochromatique de longueur d'onde dans le vide λ. On fixe à quelques centimètres de cette source un fil fin de diamètre a une distance D=5,54 m un écran E. 1-On éclaire le fil par la source laser, on observe sur l'écran des taches de diffraction. On désignera la largeur de la tache centrale par L. 1-1) Quelles est la nature de la lumière mise en évidence par le phénomène de diffraction? 1-2) Exprimer la longueur d'onde λ, en fonction de D, L et a, sachant que l'expression de l'écart angulaire entre le milieu de la tache centrale et l'un de ses extrémités est : θ=λ/a. (On considère θ petit) 1-3) On mesure la longueur L de la frange centrale pour différents fils fins. Les résultats obtenus permettent de tracer la courbe de la figure 2, qui représente les variations de L en fonction de 1/a. Par exploitation de cette courbe, déterminer la longueur d'onde λ. 2 - On refait la même expérience en fixant un cheveu exactement à la place du fil. La mesure de la largeur de la tache centrale donne : L′=42 mm Déterminer à l'aide de la courbe, le diamètre d du cheveu.

The drawing shows a wire attached to two back teeth and stretched across a front tooth. The purpose of this arrangement is to apply a force F to the front tooth. (The figure has been simplified by drawing the wire as if it ran straight from the front tooth to the back teeth) If the tension in the wire is 18.8 N, what are the magnitude and direction of the resultant force F applied to the front tooth in Newtons? Assume +y to be down and +x be to the right. Enter a positive answer if the resultant force is toward the back of the mouth. Note: If the picture below does not display, move to the next/previous question and come back to this one.

Calculate pressure, volume, moles of gas, or temperature using the ideal gas law (PV = nRT)

Graph the circle [ (x-1)^2+(y+2)^2=49 ]

Jonathan anda en bicicleta y se encuentra con una colina de altura h. En la base de la colina, está viajando con una rapidez vi. Cuando llega a la cima de la colina, está viajando con una rapidez vf. Jonathan y su bicicleta juntos tienen una masa m. Desprecie la fricción en el mecanismo de la bicicleta y entre los neumáticos de la bicicleta y la carretera. a. ¿Cuál es el trabajo externo total hecho sobre el sistema de Jonathan y la bicicleta entre el tiempo que empieza a subir la colina y el tiempo que llega a la cima? b. ¿Cuál es el cambio en energía potencial almacenada en el cuerpo de Jonathan durante este proceso? c. ¿Cuánto trabajo hace Jonathan al pedalear la bicicleta dentro del sistema Jonathan-bicicleta-Tierra durante este proceso?

Dexter Eius is running through the cafeteria when he slips on some mashed potatoes and falls to the floor. Dexter lands in a puddle of milk and skids to a stop with an acceleration of 5.6 m / s / s. Dexter weighs 703 Newtons. Determine the coefficient of friction between Dexter and the milky floor.

A 0.164-kg baseball is moving horizontally to the left at 2 m / s when it is hit by a bat. The ball flies off in the exact opposite direction. If the bat hits the ball with an average force of 508.1 N and contact time of 23.3 ms, what is the final speed of the ball?

Question 11 5 pts A fire arm of mass 7 kg fires a bullet of mass 100 g. The bullet that gains a velocity of 100 m/sec. By how much does the momentum of the fire arm change? (in units of kg m/sec)

Given: angle 1 is congruent to angle 4 Conclusion: angle 2 is congruent to angle 3

Which of the following is a true principle of inertia? A. It is a force that causes objects to move. B. It is proportional to the mass of an object. It is the tendency of an object to change its backward motion. D. It is a natural phenomenon that exists when friction is absent.

Determine the domain and range of the quadratic function. (Enter your answers using interval notation. f(x)=(x-6)^2+7 domain range

1. Identify the conditions required for the total momentum of a system to be conserved.

Which angular motion would involve moving the arm away from the midline of the body? Flexion Abduction Adduction Extension

A torque of 50.244 Nm in the counterclockwise direction is applied to a wheel on a fixed axle. A frictional torque of 10.372 Nm also acts on the wheel. If the wheel's angular acceleration is 2.0957 rad / s^2, what is the moment of inertia of the wheel? - Answer: 19.??? kgm^2

In the figure, the center of gravity (CG) of the pole held by the pole vaulter is 1.9 m from the left hand, and the hands are 0.68 m apart. The mass of the pole is 5.0 kg. - Part (a) Calculate the magnitude of the force, in newtons, exerted by his right hand. - Part (b) Calculate the magnitude of the force, in newtons, exerted by his left hand.

f is continuous for all values of x - f(-1) = 2 - y = 3 and y = 1 are horizontal asymptotes of the function. - f has no absolute maximum. - f has an absolute minimum at x = 0. - f' is positive on (-∞, -1) and (0, ∞). - f is decreasing on (-1, 0). - f is concave upward on (-∞, -1) and (-1, 1) - f'' is negative on (1, ∞)

The diameter of Neptune at its equator is approximately 4.95 × 10^4 kilometers. Write this number in standard notation. An astronomer's infrared telescope is able to detect radiation with a wavelength of 0.0000957 meters. Write this number in scientific notation.

3.12 Mastery Check Schoolo Class Score Detail mpck12plus.schoology.com/assignment/7571672267/assessment Question 1 (1 point) Light of wavelength 5.0 x 10^-7 meters consists of photons have an energy of a. 1.7 x 10^-5 J b. 1.3 x 10^-27 J c. 1.1 x 10^-40 J d. 4.0 x 10^-19 J Question 2 (1 point) Which characteristic of electromagnetic radiation is directly proportional to the energy of a photon? a. path b. period c. frequency d. wavelength Question 3 (1 point)

A child is riding a merry-go-round that has an instantaneous angular speed of 1.25 rad / s and an angular acceleration of 0.745 rad / s^2. The child is standing 4.65 m from the center of the merry-go-round. What is the magnitude of the total acceleration of the child?

A robotic machine fills containers with an acid solution at the rate of 60+4 t milliliters ( mL ) per second, where t is in seconds and 0 ≤ t ≤ 60. How many mL are put into a container in 60 seconds? Round to the nearest whole number.

Assume that military aircraft use ejection seats designed for men weighing between 140.7 lb and 205 lb. If women's weights are normally distributed with a mean of 163.2 lb and a standard deviation of 46.9 lb, what percentage of women have weights that are within those limits? Are many women excluded with those specifications? The percentage of women that have weights between those limits is 49.79%. (Round to two decimal places as needed.) Are many women excluded with those specifications? A. Yes, the percentage of women who are excluded, which is equal to the probability found previously, shows that about half of women are excluded. B. No, the percentage of women who are excluded, which is equal to the probability found previously, shows that very few women are excluded. C. No, the percentage of women who are excluded, which is the complement of the probability found previously, shows that very few women are excluded. D. Yes, the percentage of women who are excluded, which is the complement of the probability found previously, shows that about half of women are excluded.

9. A spring-loaded toy is launched straight upward from the surface of a table. In Case 1, the toy is caught at the instant that it reaches its highest point and held at rest. In Case 2, the toy is allowed to rise, then fall back to the table. In which case is the magnitude of the average velocity of the toy's free-fall motion the greatest? (A) Case 1, because the toy travels for less time (B) Case 1, because the toy has a greater displacement (C) Case 2, because the toy travels a greater distance (D) Case 2, because the toy travels for a longer time

Find the point of intersection of the lines in the figure, given that line A, in red, has equation y=x+3 and line B, in blue, has equation 2x+3y=10 x= help (fractions) y= help (fractions)

One end of a rope is tied to the handle of a horizontally-oriented and uniform door. A force F is applied to the other end of the rope as shown in the drawing. The door has a weight of 145 N and is hinged on the right. What is the maximum magnitude of F for which the door will remain at rest? 145 N 265 N 381 N 424 N 530 N

90. Which of the following is true? A) A streamline can only be defined for irrotational flow. B) A streamline cannot be defined for turbulent flow. C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow. D) A streamline is the path that a tiny element of fluid would take as the fluid flows. E) The velocity vector of a fluid element is always perpendicular to the streamline.

An energy study found that household use of electricity had a mean of 682 and a standard deviation of 551 kilowatt-hours. Complete parts (a) and (b). a. Suppose the distribution of energy use was normal. Using a table, calculator, or software that can give normal probabilities, find the proportion of households with electricity use greater than 1000 kilowatt-hours. The proportion of households with electricity use greater than 1000 kilowatt-hours is 0.28 . (Round to the nearest hundredth as needed.) b. Based on the mean and standard deviation given, do you think that the distribution of energy use actually is normal? Why or why not? No, the distribution of energy use does not appear to be normal since 0 has a z-score of only (0-682) / 551=-1.24, yet energy use cannot be negative Yes, the distribution of energy use appears to be normal since the value 682 - 551=131 is positive.

Describe the three kinds of plate boundaries. Explain your answer in at least three to four sentences.

True or False: The unpaired t-test compares two different measurements taken from the same individual. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True b False

Problem 1: (10% of Assignment Value) Problem Status A student stands (do=2.5 m) in front of a floor-to-ceiling mirror. Her eyes are (he=1.43 m) above the floor and she holds a flashlight at a distance (hf=0.75 m) above the floor. Randomized Variables (do=2.5 m) (he=1.43 m) (hf=0.75 m)

Question 5 1 pts Crow on roof Part E Problem A 0.680 kg crow slides down an inclined roof, as shown in the figure. The roof makes an angle of 30.0° with respect to the horizontal. There is negligible friction between the roof and the crow. Use g=9.80 m / s^2. Using your answers from parts (a) through ( d ), what can you conclude about how the choice of a coordinate system affects the acceleration found via a force analysis? (There may be more than one correct statement here.) The x - and y -components of a vector remain unchanged when a different coordinate system is used. The x - and y-components of a vector change when a different coordinate system is used. The magnitude of a vector remains unchanged when a different coordinate system is used. The magnitude of a vector changes when a different coordinate system is used.

Use the graph shown to find the following. (a) The domain and range of the function (b) The intercepts, if any (c) Horizontal asymptotes, if any (d) Vertical asymptotes, if any (e) Oblique asymptotes, if any (a) What is the domain? Select the correct choice below and fill in any answer boxes within your choice. A. The domain of the function is x . (Type an inequality in the form x ≠. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) B. The domain of the function in the graph is the set of all real numbers.

What is the zeroth law of thermodynamics? - The temperature of a system can never reach absolute zero. - There is a maximum temperature. - Work done on a system decreases entropy. - Two systems in thermal equilibrium with a third system are in equilibrium with each other.

Determine whether the vector field is conservative. If it is, find a potential function for the vector field. (If the vector field is not conservative, enter DNE.) F(x, y) = sin(y) i + x cos(y) j f(x, y) =

A small plane is 4 miles by land away from the airport. The angle of elevation from the airport to the airplane is 6.5 degrees. What is the altitude of the plane? Round your answer to the nearest tenth of a mile.

Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by electric transmission lines. A typical high-voltage transmission line is 20 m above the ground and carries a 200 A current at a potential of 110 kV. Part A What is the magnetic field strength on the ground directly under such a transmission line? Express your answer with the appropriate units. B= Value Units

What isthe moximum size of an object that gests brighter and fairfer on a timescale of seconds?

At 12 pm, the temperature was 57 degrees F. By 5 pm, the thermometer read 36 degrees F. Assuming a constant change in temperature, calculate and interpret the average rate of change.

1. Ausbreitung Wasserwelle a) In einem See beobachten Sie den Wellengang. In einer Minute zählen Sie 10 Wellen, die Sie erreichen. Der Abstand von zwei Wellenbergen beträgt etwa 12m. Wie groß ist die Ausbreitungsgeschwindigkeit der Wellen? b) Andere Wasserwelle: Während 12 Schwingungen innerhalb von 3 Sekunden ablaufen, breitet sich eine Störung um 3,6 m aus. Berechnen Sie Wellenlänge, Frequenz und Ausbreitungsgeschwindigkeit der Welle. 2. Momentaufnahme Seilwelle Mit Hilfe eines Seils lässt sich sehr einfach eine Querwelle (Transversalwelle) erzeugen. Die beiden Bilder unten zeigen zum einen die (idealisierte) Momentaufnahme der Seilwelle und zum anderen den Verlauf der Schwingung eines "Seilteilchens". Hinweis: y stellt hier die Auslenkung s dar. a) Welches der beiden Bilder ist die Momentaufnahme der Welle, welches stellt die Schwingung eines Seilteilchens dar?

A lab student applies a force to an air puck equal to that shown in the figure at the right. If the mass of the puck is m=3.5 kg and its initial velocity is vi=0 m / s, find the puck's final velocity. (Hint: you can assume there is no friction acting on the puck)

Given the vectors u=6i+5j and v=7i-7j, find the angle (in degrees) between them. Angle between u and v= - Round answers to 2 decimal places as needed.

9. Answer the following questions about the image in Figure 1 a. Define an Electromagnetic (EM) wave. b. How many cycles are represented for the EM wave? c. If the period of the EM wave is 7.14 × 10^-8 seconds, what is its frequency? d. State the Principle of Electromagnetism illustrated in Figure 1

Electrical systems are governed by Ohm's law, which states that V=I R, where V= voltage, I= current, and R= resistance. If the current in an electrical system is decreasing at a rate of 7 A/S, while the voltage remains constant at 10 V at what rate is the resistance increasing when the current is 28 A. A. 0.4 Ω/s B. 0.1 Ω/s C. 2.5 Ω/s D. 17.5 Ω/s

Suppose when you inverted the eudiometer, a bubble of air became trapped inside it. Would this make your experimental value of R larger, smaller, or have no effect? Briefly explain your response.

Question 2 20 pts Choose the incorrect statement. The gravitational force exerted on a satellite by Earth depends on Earth's mass. depends on the satellite's speed. depends on the satellites mass. is directed toward Earth's center.

Calculation-based problems (please use PSW). 6. ( 20 pts ) A dog (23.0-kg) is riding in an elevator which is moving upward, Ignore any resistance. (a) Determine the acceleration of the elevator, when the normal force from the elevator to the dog is 252.5 N. (b) Determine the normal force from the elevator to the dog, when the elevator is slowing down at a rate of 0.87 m / s^2.

Due studenti devono misurare la densità di un liquido. Il primo studente prende una vaschetta di plastica, a forma di parallelepipedo, vuota, ne misura le dimensioni l1, l2, l3 e la massa mv e poi la riempie con il liquido e misura la massa totale Mν+1 li. Il secondo studente prende un cilindro graduato, ne misura la massa mc poi lo riempie con una certa quantità di liquido VL e misura la massa totale Mc+1 iq. I risultati delle loro misure, dalle quali ricavano la densità del liquido, sono riportati nella tabella.

20) The Cathode Ray Tube Experiment confirmed the charge of the electron A. The positive end of a magnet deflected the electron beam away: B. The positive end of a magnet attracted the electron beam. C. The negative end of a magnet attracted the electron beam. D. The magnet had no effect on the electron beam.

Use the graph to answer the following questions. Answers have a 5% tolerance to allow for estimation. Note that slope may be positive or negative. What is the y-intercept of the graph? What is the slope of the graph?

E H parallel to F G and G H parallel to E F. Complete the proof that E F is congruent to G H. - Statement - Reason 1. E H parallel to F G - Given 2. G H parallel to E F - Given 3. angle E G F is congruent to angle G E H - Alternate Interior Angles Theorem 4. angle F E G is congruent to angle E G H - Alternate Interior Angles Theorem 5. E G is congruent to E G - Reflexive Property of Congruence 6. triangle E F G is congruent to triangle G H E - 7. E F is congruent to G H -

To approach the runway, a pilot of a small plane must begin a 5° descent starting from a height of 163 mile, how many miles from the runway is the airplane at the start of this approach?

What is the volume of this cone? Use π ≈ 3.14 and round your answer to the nearest hundredth. cubic inches

In the figure above depicts the before- and after-collision speeds of a 0.41 kg toy car that undergoes a head-on collision with a wall. In Case A, the car bounces off the wall. In Case B, the car crumples up and sticks to the wall. Which correctly describes the change in velocity experienced by these cars? □ Car B experiences a greater change in velocity than Car A □ Car B's change in velocity is -4 m/s □ Car A's change in velocity is -6.8 m/s □ Car B's change in velocity is 0 m/s because it stops □ Car A's change in velocity is -1.2 m/s □ Car A experiences a greater change in velocity than Car B

Calculate the critical angle when light travels from a medium (n=2.4) to air?

In case of total internal reflection index of refraction (nb / na) for nb in na is 1 / Sin θcrit Sin θcrit None 1 / Sin θ^2 crit

Biot-Savart Direction A left B right C out of the screen D into the screen E B = 0 B = (q μ0 v × r̂) / (4 π r^2)

A distant star has a single planet circling it in a circular orbit of radius 7.51 x 10^11 m. The period of the planet's motion about the star is 726 days. What is the mass of the star? The value of the universal gravitational constant is 6.67259 x 10^-11 N · m^2 / kg^2. Answer in units of kg.

0 dB = 20 μPa 70 dB = 200 Pa 0 dB = 20 x 10^-6 pa 80 dB = 2000 pa 0 dB = 2 x 10^-5 Pa 90 dB = 20,000 Pa 10 dB = 2 x 10^-4 Pa 100 dB = 2,00,000 Pa 20 dB = 2 x 10^-3 Pa 110 dB = 2 x 10^6 Pa 30 dB = 2 x 10^-2 Pa 120 dB = 2 x 10^7 pa 40 dB = 2 x 10^-1 Pa 50 dB = 2 pa 60 dB = 20 Pa

Will your boat float with one penny? Why or why not?

A child pulls a sled with constant speed pulling the rope at an angle of 30° to the horizontal and drags the sled for 100 m. The friction coefficient is 0.30. What work did the friction force do if the sled's mass is 9.9 kg? Express your answer with the appropriate units.

Given R=0.0821 L-atm/mol·K, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270 K? (1 point) 69.2 L/mol 7.10 L/mol 86.5 L/mol 22.2 L/mol

Question 6 Determine if the lines are parallel, perpendicular, or neither. y=7x+8 and y=7x-15 Parallel Perpendicular Neither I don't know

315,09 · cos 77° 1,3' = 315,09 · cos 257° 1,3' =

The diagram provided shows a long, straight wire carrying current i within a region of uniform magnetic field. The magnetic force experienced by the wire is also indicated in the diagram, but the magnetic field's direction is not shown. Given the information in the diagram, what must the direction of the magnetic field be? into the plane of the figure out of the plane of the figure downward upward None of the choices are correct

One of the most famous equations is Einstein's E=mc^2. If you could somehow change the mass of a 1.0-gram paper clip into paper clip into pure energy, how many joules of energy would result? (Hint: 1,000 grams =1 kg ) From your answer from part 1, convert this into tons of TNT. The ton of TNT is a unit of energy defined to be 4.184 gigajoules or 4.184 x 10^9 joules. How does this compare to a modern-day atomic bomb?

Enrico is standing in a very cold day (it is 2°C) and he yelled and he hears sound waves reflected off a mountain nearby and come back to him 8 seconds later. Enrico wants to know how far is that mountain from him.

A 65 kg driver gets into an empty taptap to start the day's work. The springs compress 2.5 × 10^-2 m. What is the effective spring constant of the spring system in the taptap? Enter the spring constant numerically in newtons per meter using two significant figures.

Write an exponential function in the form y=ab^x that goes through the points (0,4) and (9,2048).

Chapter 28 HW (MP) - PHY211. MasteringPhysics: Ch 28: Quiz The 10 Ω resistor in (Figure 1) is dissipating 20 W of power Part A How much power is the 5 Ω resistor dissipating? Express your answer with the appropriate units. Part B How much power is the 20 Ω resistor dissipating? Express your answer with the appropriate units.

Use the function below to answer the following questions. m(x)=-e^x-1 (a) Use transformations of the graph of y=e^x to graph the given function. (b) Write the domain and range in interval notation. (c) Write an equation of the asymptote.

Integrals for Mass Calculations A spherical solid, centered at the origin, has radius 81 and mass density δ(x, y, z)=87-(x^2+y^2+z^2). Find its mass. ∫ ∫ ∫ δ(x, y, z) dV=∫ ∫ ∫ d rho d theta d phi= For your answers theta= theta, rho= rho, phi= phi.

Question 4 What unit of time is based on the rotation of the Earth? month day hour year

Analyze the free-body diagram. (The elevator is moving downwards.) Fnet = 50 N speed: increasing

Volume-Pressure. How would you expect the pressure to change if you changed the size of the balloon (while keeping the same number of gas molecules)? A Inversely proportional (B) Directly proportional (C) They are not related.

m angle 2 = 125°. Find m angle 3.

A proton (charge e ), traveling perpendicular to a magnetic field, experiences the same force as an alpha particle (charge 2e ) which is also traveling perpendicular to the same field. The ratio of their speeds, vproton / valpha is 0.5 4 1 8 2

Part C Because we are ignoring friction, no thermal energy is generated and the total energy is the mechanical energy, the kinetic energy plus the potential energy: E=K+U. Observe the total energy bar on the Bar Graph. As the skater is skating back and forth, which statement best describes the total energy? smallest at the locations where the skater turns to go back in the opposite direction and greatest at the lowest point of the track. The total energy is the same at all locations of the track. greatest at the locations where the skater turns and goes back in the opposite direction and smallest at the lowest point of the track.

Explain in molecular terms why the pressure of a gas increases with increasing temperature when the volume is held constant. Select the single best answer. As the temperature increases, the kinetic energy of gas particles increases, which in turn increases only the average force of collisions. As the temperature increases, the kinetic energy of gas particles increases, which in turn increases both the average force of collisions and the frequency of collisions. As the temperature increases, the kinetic energy of gas particles decreases, which in turn increases only the frequency of collisions. As the temperature increases, the kinetic energy of gas particles decreases, which in turn decreases only the frequency of collisions.

A Saturn V's mass at liftoff was 2.80 × 10^6 kg, its fuel-burn rate was 1.40 × 10^4 kg / s, and the exhaust velocity was 2.40 × 10^3 m / s. Calculate its initial acceleration.

QUESTION 11 Use the following to answer questions 11 thru 14. Two blocks of masses m1=12.0 kg and m2=30.0 kg are connected by a light string as shown below. The coefficient of kinetic friction between m1 and the table is μ=0.250 and m2 is initially located at y=6.0 meters above the floor. Assuming the system starts from rest, draw a free body diagram for each block and determine the normal force acting upon m1.

F1=800 145^circ F2=700 215^circ F3=900 290^circ F4=600 340^circ

After a great deal of experimentation, two college senior physics majors determined that when a bottle of French champagne is shaken several times, held upright, and uncorked, its cork travels according to the function below, where s is its height (in feet) above the ground t seconds after being released. s(t)=-16t^2+30t+4 a. How high will it go? b. How long is it in the air? a. The cork will go feet. (Round to the nearest whole number as needed) b. The cork will be in the air for seconds. (Type an integer or decimal rounded to two decimal places as needed.)

Use Green's Theorem to evaluate the line integral. Assume the curve is oriented counterclockwise. ∮(2x+sinh y) dy-(5y^2+e^(x^2)) dx, where C is the boundary of the square with vertices (1,3),(3,3),(3,5), and (1,5). ∮(2x+sinh y) dy-(5y^2+e^(x^2)) dx= (Type an exact answer.)

A 0.141-kg particle undergoes simple harmonic motion along the horizontal x-axis between the points (x1=-0.299 mathrm~m) and (x2=0.387 mathrm~m). The period of oscillation is 0.649 s . Find the frequency, (f), the equilibrium position, (xmathrmeq), the amplitude, (A), the maximum speed, (vmax ), the maximum magnitude of acceleration, (atext max ), the force constant, (k), and the total mechanical energy, (Etext tot ). (f=) (A=) (amax =) (mathrmHz ) (xmathrmeq=) (mathrmm ) (vmax =) (k=) (Etext tot =)

Which electromagnetic waves have wavelengths from about 400 -billionths to 10-billionths of a meter? infrared waves microwaves ultraviolet waves radio waves

Find the magnitudes of the horizontal and vertical components for the vector v, if α is the direction angle of v from the horizontal α=39°, v=54 The magnitude of the horizontal component of v is (Round to the nearest integer as needed.)

Calculate the wavelength of light (in nm) for an electron in a H atom going between the n=2 and n=3 energy levels. Report your answer to the nearest nm. RH=1.097 x 10^7 m^-1 (Since we are dealing with wavelengths, these must always be positive numbers!)

Considering only the initial and final situations, identify which mechanical energies have changed. In addition, determine whether you will need to consider any work done by external forces or changes in thermal energy. Check all that apply. Kinetic energy has changed. Gravitational potential energy has changed. Spring potential energy has changed. Work by external forces on the system must be considered. Thermal energy of the system has changed. Submit Request Answer

A tumor is injected with 0.6 grams of Iodine-125, which has a decay rate of 1.15% per day. Write an exponential model representing the number of grams f of Iodine-125 remaining in the tumor after t days. f(t)=

Given the velocity v=ds/dt and the initial position of a body moving along a coordinate line, find the body's position at time t. v=9.8 t+7, s(0)=17 s(t)=

A businessman dropped a coin from the top floor of his office building and it fell according to the formula S(t)=-16 t^2+12 t^0.5, where t is the time in seconds and S(t) is the distance in feet from the top of the building. What was the average speed of the fall? Use the fact that the coin hit the ground in exactly 2.2 seconds. Round your answer to 2 decimal places.

Which of the following reaction-energy diagrams represents the reaction with the highest equilibrium constant, Keq?

Ch 04: DynamicsForce and Newton's Laws of Motion 1. A force is a A. scalar B. vector An object which is moving has a net force acting on it in the direction of motion. 2. A. Definitely B. Maybe C. No way Which of the following describes the relationship for forces between pairs of interacting objects? 3. A. An object's acceleration is inversely proportional to its mass. B. For every action there is an equal but opposite reaction. C. The natural condition for a moving object is to remain in motion. D. The natural motion for a moving object is to come to rest. The mass of a 28000 N elevator is 4. A. 2698 kg B. 2358 kg D. 2336 kg C. 2681 kg E. 3220 kg F. 2857 kg

Without graphing the function, determine its amplitude or period as requested. y=-3 cos 1/2 x Find the period. 4 pi pi/2 3 pi/2 -3

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