Physics Homework Questions & Answers Archive

(a) Find a relationship of the form T = mx + b where T is degrees Fahrenheit and x is altitude in thousands of feet. (b) Find the boiling point at an altitude of 4,400 feet. (c) Find the altitude if the boiling point is 202.5 degrees F. (d) Graph T and illustrate the answers to (b) and (c) on the graph. (a) Choose the correct relationship below A. T=-184 x+212 B. T=1.84 x+212 C. T=-1.84 x-212 D. T=1.84 x-212

Question A triangle has a base that is decreasing at a rate of 8 cm / s with the height being held constant. What is the rate of change of the area of the triangle if the height is 2 cm? Provide your answer below: The rate of change of the area of the triangle is cm^2 / s.

lectron configuratic S) Unit 6.3: Electron configuratic ewton.com/learn/course/6483d9b5-3bb6-46c1-9dd6-da9f14d6cfc7/assignment/273518a8-dc11-4144-bc62-93ab072d820f First up, let's review the assignment's learning objectives Get familiar with this topic by reviewing instruction and answering a couple of questions. Question What are the properties of ferromagnets? Select all that apply: They have permanent magnetic dipole moments. Unpaired electrons in these substances have aligned spins. Unpaired electrons have partially aligned spins. Local magnetic moments are in opposite directions but do not have equal magnitude and so do not cancel out completely They can lose their permanent magnetic dipole when heated. FEEDBACK MORE INSTRUCTION Content attribution

One of the particles in an atom is the proton. A proton has a radius of approximately 1.0 x 10^-13 cm and a mass of 1.7 x 10^-24 g. Part A Determine the density of a proton. (Hint: Find the volume of the proton and then divide the mass by the volume to get the density.) (volume of a sphere = 4/3 pi r^3 ; pi=3.14 ) Express your answer to two significant figures and include the appropriate units.

How should the gas bubble should be read?

Scale drawings of three objects, A, B, and C are shown below. Each object has the same mass and uniform thickness, with the mass distributed uniformly within the shaded region. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?

Introduction to the Physical Sciences: Mastery Test Drag each tile to the correct box. A student writes down several steps of the scientific method. Put the steps in the best order

Graph 1

Differentiate the following function. f(x)=x^4 e^4 x f'(x)=

between the means statistically significant or not significant? Analysis of variance (ANOVA) is sometimes called the F test (T/F)?

P waves are transverse compressional tensional

- You were first asked to elicit a second stimulus after the force of the muscle completely fell. The second stimulus should have resulted in a stronger second contraction. What phenomenon was demonstrated and what generally causes that phenomenon? -When asked to elicited multiple stimuli before the muscle completely relaxed, what kind of summation were you simulating? - When you were asked to "mash" the stimulus button, what phenomenon were you trying to simulate?

A batter applies an average force of 8000 N to a baseball for 1.10 s . What is the magnitude of the impulse delivered to the baseball?

When a car goes around a curve, it has a tendency to skid outwards. Is the frictional force between the tires and the ground that keeps the car from skidding kinetic or static?

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as shown in the figure below. The length of the arc ABC is 245 m, and the car completes the turn in 33.0 s. (a) Determine the car's speed. 7.42 m / s (b) What is the magnitude and direction of the acceleration when the car is at point B? magnitude Your response differs from the correct answer by more than 10%. Double check your calculations. m / s^2 direction - counterclockwise from the +x-axis

a. Find the local extrema of the function f(x) = sin 3x on the interval 0 ≤ x ≤ 2π/3, and say where they occur. b. Graph the function and its derivative together. Comment on the behavior of f in relation to the signs and values of f′.

In the figure, a constant horizontal force ( vecFa p p ) of magnitude 24.6 N is applied to a uniform solid cylinder by fishing line wrapped around the cylinder. The mass of the cylinder is 16.1 kg, its radius is 0.254 m, and the cylinder rolls smoothly on the horizontal surface. (a) What is the magnitude of the acceleration of the center of mass of the cylinder? (b) What is the magnitude of the angular acceleration of the cylinder about the center of mass? (c) In unit-vector notation, what is the frictional force acting on the cylinder? (a) Number Units (b) Number Units (c) Number ( hati+ ) Units

QUESTION 20 · 1 POINT Suppose a chef claims that her meatball weight is less than 4 ounces, on average. Several of her customers do not believe her, so the chef decides to do a hypothesis test, at a 10% significance level, to persuade them. She cooks 14 meatballs. The mean weight of the sample meatballs is 3.7 ounces. The chef knows from experience that the standard deviation for her meatball weight is 0.5 ounces. - H0: μ ≥ 4; Ha: μ<4 - α=0.1 (significance level) What is the test statistic (z-score) of this one-mean hypothesis test, rounded to two decimal places? Provide your answer below: Test statistic =

A fitness center claims that the mean amount of time that a person spends at the gym per visit is at most 38 minutes.

Find the slope of the graphed line.

Find the slope of the line that passes through the following points. Simplify your answer. (1,4) and (-9,-10)

Plot points between and beyond each (x)-intercept and vertical asymptote. Find the value of the function at the given value of (x). (x: -4, -3, -1/2, 1/2, 3, 4) (f(x) = 6x^2 / (x^2 - 1)) (Simplify your answers.)

View Policies Current Attempt in Progress As the text discusses, the conservation of linear momentum is applicable only when the system of objects is an isolated system. V of the systems listed below are isolated systems? 1. A ball is dropped from the top of a building. The system is the ball. 2. A ball is dropped from the top of a building. The system is the ball and the earth. 3. A moving billiard ball collides with a stationary billiard ball on a frictionless pool table. The system is the moving ball. 4. A car slides to a halt in an emergency. The system is the car. 5. A space probe is moving in deep space where gravitational and other forces are negligible. The system is the space probe. Only 1 and 3 are isolated systems. Only 2 and 5 are isolated systems. Only 4 and 5 are isolated systems. Only 5 is an isolated system. Only 3 and 5 are isolated systems.

Graph the solution to the following system of inequalities. y ≥ 3x + 5 y < -3x - 2

Jennifer boards a Ferris wheel with radius 25 feet. The center of the Ferris wheel is 30 feet above the ground. The Ferris wheel starts to move and spins 1 rotation every 5 minutes. It gets up to speed, t=0, when Jennifer is at the mid-line and moving up. a) What is the maximum height of the Ferris wheel? feet

Given that triangle ABC is similar to triangle A'B'C', solve for x and y. Use fractions as your answer where helpful. Round to three decimal places.

Graph the solution of the system of linear inequalities. [ 5 x-3 y leq 15 y leq-5 ]

Some of the light that atomic hydrogen can emit has wavelengths of 21 cm (radio), 656 nm (red), 1.88 µm (infrared), 410 nm (violet), and 122 nm (ultraviolet). Arrange these from fastest speed to slowest speed in empty space. cm=10^-2 m (centimeters), µm=10^-6 m (microns), and nm=10^-9 m (nanometers). There is not enough information to determine the speeds. 122 nm, 410 nm, 656 nm, 1.88 µm, 21 cm 21 cm, 1.88 µm, 656 nm, 410 nm, 122 nm 1.88 µm, 21 cm, 122 nm, 410 nm, 656 nm They all travel at the same speed.

Determine whether the given graph is symmetric with respect to the x-axis, the y-axis, and the origin. x^4 = y^3(4+x^2)

Which of the following contributed to the idea that electrons occupy orbitals? Select the correct answer below: Aufbau principle Pauli exclusion principle Hund's principle Heisenberg uncertainty Principle

A lighthouse stands 400 m off a straight shore and the focused beam of its light revolves three times each minute. As shown in the figure, P is the point on shore closest to the lighthouse and Q is a point on the shore 175 m from P. What is the speed of the beam along the shore when it strikes the point Q? Describe how the speed of the beam along the shore varies with the distance between P and Q. Neglect the height of the lighthouse. Let x be the distance along the shore from point P to the beam and let θ be the angle through which the light revolves. Write an equation that relates x and θ. tan θ = x / 400 Differentiate both sides of the equation with respect to t. dx / dt = (400 sec^2 θ) dθ / dt When the beam strikes the point Q, its speed along the shore is about 8981 m / min.

True or False Question Once "closed" or ossified, growth in length no longer occurs at an epiphysial plate. True False

Find dy/dx by implicit differentiation. tan^(-1)(3x^2y) = x + 4xy^2 dy/dx =

What are the three common fault types?

Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 2 m / s, how fast is the area of the spill increasing when the radius is 40 m?

Part 2: you are given an area (=probability), and you need to compute c, which is the z-score that corresponds to the statement: P(-c<z<c)=0.5 (This is an inverse standard normal distribution problem. Use technology to compute c) The arrow can only be dragged to tick marks that are multiples of 0.1 So, round c to 1 decimal place, and then move the arrow to that rounded value. Click on the "Shade" menu to select the shading option corresponding to the question (to the left, to the right, or between 2 values). (If the question is less c, choose Left of a value. If it greater than c, choose right of a value.) Then slide the arrow to the round value of c. Shade: Left of a value. Click and drag the arrows to adjust the values.

The formula s = 2√fL can be used to approximate the speed s, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 60 mph? The car will skid feet.

Quiz: Chapter 11 Homework Ch. 11 Key Terms - Astronomy 2 e /36433/quizzes/152506/take Question 4 What allowed the Voyager 2 spacecraft to make a "tour" of all four of the jovian planets in the late 1970's and the 1980's? NASA had developed a completely new kind of rocket that could send the craft fro planet to planet the four planets were approximately aligned on one side of the Sun and we used th gravity of each planet to speed up the spacecraft to get to the next one in its path the spacecraft stopped off to collect fuel on the satellites of each planet before proceeding to the next one we used laser beams to propel the spacecraft into the outer solar system, where sunlight is dim you can't fool me, no spacecraft has ever explored four different planets Question 5 1 pts The first spacecraft which did not merely fly by a jovian (or giant) planet, but actually went into orbit around it for an extended period of time was

A droplet of ink in an industrial ink-jet printer carries a charge of 1.4 x 10^-10 C and is deflected onto paper by a force of 2.7 x 10^-4 N Find the strength of the electric field to produce this force. Express your answer with the appropriate units.

QUESTION 4 Which of the following do you think are the major contributions to global climate change? A. Burning fossil fuels and recycling B. All of these are major contributors to global climate change C. Deforestation and nuclear energy D. Fossil fuels and nuclear energy E. Burning fossil fuels and deforestation

A 0.490 -m-long guitar string, of cross-sectional area 1.00 x 10^-6 m^2, has Young's modulus Y=2.00 GPa. By how much must you stretch the string to obtain a tension of 16.1 N?

what is the pressure of mercury

Consider the probability that no more than 81 out of 104 computers will not crash in a day. Assume the probability that a given computer will not crash in a day is 33% Specify whether the normal curve can be used as an approximation to the binomial probability by verifying the necessary conditions.

A radar gun was used to record the speed of a runner during the first 5 seconds of a race (see table). Use Simpson's rule to estimate the distance the runner covered during those 5 seconds. t(s) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 v(ft / s) 0 3.05 3.25 7.1 7.7 9.25 9.55 10.35 10.7 10.85 10.85

A man, with his arms at his sides, is spinning on a light frictionless turntable. When he extends his arms: his rotational kinetic energy increases his angular velocity increases his angular momentum remains the same his angular velocity remains the same his rotational inertia decreases

During which stage of sleep do brain waves resemble those of waking more than those of quiet sleep? Stage 1 non-REM sleep REM sleep "Delta" sleep Stage 2 non-REM sleep Semiconscious sleep

In the next section, you'll be able to select which gas is in the soap bubble, and which gas is in the glass tank: Your job is to predict in advance whether a particular bubble will float in a particular gas. Select a combination, one gas for the bubble, and one for the tank, so that you think the bubble will definitely float.

Use a double integral to find the area of the region bounded by the cardioid (r=5(1-cos theta)). Set up the double integral as efficiently as possible, in polar coordinates, that is used to find the area. (r drdtheta ) (Type exact answers, using (pi) as needed.)

Find the vector equation for the line of intersection of the planes 3x-y-4z=-3 and 3x+3z=-5

QUESTION 12 - 1 POINT An object is launched directly in the air at a speed of 144 feet per second from a platform located 12 feet in the air. The motion of the object can be modeled using the function f(t)=-16 t^2+144 t+12, where t is the time in seconds and f(t) is the height of the object. When, in seconds, will the object reach its maximum height? Do not include units in your answer.

Describe a congruence transformation that maps the blue preimage to the green image. a 270° rotation about the origin a reflection in the line y=-1 a reflection in the line y=-x a 180° rotation about the origin

A 78.0 kg object is traveling due north at 15.2 m / s when it begins to experience a constant net force of 1.72 kN toward the south. What will its velocity be 0.75 s later? Multiple Choice 1.30 m / s, south. 16.5 m / s, south 1.30 m / s, north. 18.8 m / s, south 18.8 m / s, north. 16.5 m / s, north

1. Consider the framing plan below. Assume a Dead Load of 60 PSF. a. Calculate the tributary width for each beam. (5 pts) b. Calculate the end reactions for each beam. (10 pts) c. Draw a Free Body Diagram (FBD) and calculate the end reactions for each girder. ( 25 pts) d. Calculate the total axial load in columns C1 and C2. (10 pts)

A sound wave has an equation y=7 sin (58 pi t) where t= time in seconds What is its frequency? [?] cycles/second

What is the free-fall acceleration at the surface of the moon? Express your answer in meters per second squared to three significant figures.

A particle moves along the x-axis. Its position is given by p(t)=2t^3-9t^2+15 inches where time is measured in seconds. What is the object's acceleration at t=5 seconds?

The temperature is 8°C. What is that in °F?

If you double the throw angle, will the distance the ball travels double? Explain.

DAY 1, 08:10 SCORE: 40 / 100 PROGRESS: 39% You are now launching an ion! Which three transporters can let ions into a cell? Click on them. Voltage-Gated Aquaporin Antiporter Mechanically-Gated

Which of the following results in the null hypothesis μ ≥ 38 and alternative hypothesis μ<38? Select the correct answer below: A fitness center claims that the mean amount of time that a person spends at the gym per visit is at most 38 minutes. A fitness center claims that the mean amount of time that a person spends at the gym per visit is fewer than 38 minutes. A fitness center claims that the mean amount of time that a person spends at the gym per visit is 38 minutes. A fitness center claims that the mean amount of time that a person spends at the gym per visit is more than 38 minutes.

Solve the following system of linear equations by substitution and determine whether the system has one solution, no solution, or an infinite number of solutions. If the system has one solution, find the solution. 9y = 9x - 9 -x + y = -1

Find the integrating factor μ(x) for the following ODE 2 y′+(x sin x) y=x^2

What does a Signal Level Meter (SLM) measure?

Determine the following limit. lim θ→∞ (sin 9θ)/(11θ)

Write in terms of i. Simplify your answer as much as possible. -√(-54)

Problem 9: (8% of Assignment Value) A basketball center fires a free-throw with initial velocity (v0=9.5 mathrm~m / mathrms) at an angle (theta=26^circ) above the horizontal. Use a Cartesian coordinate system with the origin located at the position the ball was released, with the ball's horizontal velocity in the positive x direction and vertical component in the positive y-direction. Assume the basketball encounters no air resistance. - Part (a) Determine the maximum vertical height (hmax), in meters, the ball attains above the release point. (hmax=0.8800 mathrm~m) Part (b) Determine the time, (t) in seconds, the basketball takes to reach its maximum vertical height. (t=)

In 5-6 sentences, describe the characteristics of Earth's crust. Write your answer in the space below.

10.0 g Cu was heated to 600°C then dropped into water at 25°C If gow hod 325 g water what is the final temp. Cω=0.385 S / g°C C4.0=4.184 J / g°C

Let T be the tetrahedron with vertices (2,0,0),(0,2,0),(0,0,4) and the origin. Write ∭T f(x, y, z) dV in the form: ∫ from 0 to 2 ∫ from 0 to u(x) ∫ from 0 to v(x, z) f(x, y, z) dy dz dx u(x)= v(x, z)=

Question 5 Not yet answered Points out of 1.00 Flag question The Endocrine Disruptor Screening Program a. will test pesticides for their ability to cause cancer. b. is being developed by the EPA and will screen chemicals for potential endocrine disruption. c. will examine all disease causing aspects of pesticides. d. has already identified and banned more than 300 pesticides that disrupt the endocrine system. Quiz navigation

Two masses m1=3.00 kg and m2=4.00 kg are suspended from a system of strings attached to the ceiling as shown in the figure below. Determine the magnitude of the tensions T1 and T2. Pay close attention to what the angles are measured with respect to.

Two students argue over the differences between speed and velocity. One student says, "Speed is a vector because it describes how fast an traveling. Velocity is a scalar because it tells how fast and what direction an object is traveling." Which of the following statements is correct? (A) The student's understanding of all four terms (speed, velocity, scalar, and vector) is correct. (B) The student's understanding of speed and velocity is correct but their understanding of scalar and vector is incorrect. (C) The student's understanding of all four terms (speed, velocity, scalar, and vector) is incorrect. (D) The student's understanding of speed and velocity is incorrect but their understanding of scalar and vector is correct.

A plane makes an angle of 30.0° with the horizontal. The force required to cause a 15 kg box to slide up the plane with an acceleration of 1.2 m / s^2.

Two cars start moving from the same point. One travels south at 20 mi / h and the other travels west at 15 mi / h. At what rate (in mi/h) is the distance between the cars increasing three hours later?

Homework: Section 6.1 Score: 6.5/7 Answered: 6 / 7 Question 7 The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 64 ounces and a standard deviation of 11 ounces. Using the Empirical Rule, answer the following questions. Suggestion: Sketch the distribution. a) 68% of the widget weights lie between and b) What percentage of the widget weights lie between 31 and 75 ounces? % c) What percentage of the widget weights lie below 86 ? % Question Help: Video Submit Question

2.9 The Quotient Rule Calculus Name: 1. h(x) = (r^2 + tr - 1) / (x - 1) h'(x) = L(2x + 4)(x - 3)^-3 - (x^2(4x - 1) + 1) 2(x^2) f'(x) = (2x^2 - 6x + 4x - 12 - x^2 - 4x + 1) / (x - 3)^2 (x^2 - 6x - 11) / (x - 3)^2 2. g(x) = set / (2 sin x) 3. f(x) = enas / (z - 16) 4. g(x) = (4x^3 - 5x^2 + 5x) / x^2 5. h(x) = 5x^2 / ln x (4x^3 - 5x^2 + 5x) = 12x^2 - 10x + 5 g'(x) = (12x^2 - 10x + 5)(x^2) - (4x^3 - 5x^2 + 5x)(2x) / (x^2)^2 g'(x) = (4x^4 - 5x^2) / x^4 g'(x) = 4 - 5/x^2 6. f(x) = (x + 2) / (x^2 + 2) 7. h(x) = (8x^3 + 4x^2 - 9x) / 2x

Find the general solution of the differential equation 121 y'' + 176 y' + 64 y = 0 . Use c1, c2 for the constants of integration. Use t for the independent variable. y(t)=

Question 14 (4 points) MC Ch 12. For climate zone 5, the minimum R value of air impermeable insulation is? 1) R-15+1/2'' foam board 2) R-20 3) 2 times zone 3 B. 4) not less than R-25

-2x-y-z+5=0 -x-2y-z+10=0 -x-y-2z+8=0

Two charged particles exert an electrostatic force of 20 N on each other. What will the magnitude of the electrostatic force be if the distance between the two charges is reduced to one-third of the original distance? (A) 170 N (B) 180 N (C) 190 N

An artery has a diameter of 1.2 cm and blood flows through it with a velocity of 3.2 cm / s. If at some point there is plaque buildup, such that the artery has its diameter narrowed to 30% of its initial diameter. What velocity is the blood in the region with plaque buildup?

The United States currently imports 9.5 x 10^6 barrels of oil each day. If a cylindrical storage tank were to be constructed with a base of diameter 41 ft. With 1.0 barrel = 42 gals, answer the following questions. What would be the height of the container to store this daily consumption? (Round the final answer to two decimal places.) The height of the container is ft.

You weigh 530 N. Your bathroom scale contains a light but very stiff ideal spring. When you stand at rest on the scale, the spring is compressed 1.80 cm. Your 180 N dog then gently jumps into your arms. Part A How much work is done by the spring as the two of you are brought to rest by friction? Express your answer to three significant figures and include the appropriate units. W= Units

A light, inextensible cord passes over a light, frictionless pulley with a radius of 15 cm. It has a 14 kg mass on the left and a 2.4 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 2.9 m apart. The acceleration of gravity is 9.8 m / s^2. At what rate are the two masses accelerating when they pass each other? Answer in units of m / s^2.

In triangle JKL, cos(K) = 24/51 and angle J is a right angle. What is the value of cos(L)?

Module Test 14. A localized, abnormal dilation of a vessel is known as a(n): arrhythmia aneurysm bradycardia coarctation

Hospitals typically require backup generators to provide electricity in the event of a power outage. Assume that emergency backup generators fail 38% of the times when they are needed. A hospital has two backup generators so that power is available if one of them fails during a power outage. Complete parts (a) and (b) below. a. Find the probability that both generators fail during a power outage. (Round to four decimal places as needed.) b. Find the probability of having a working generator in the event of a power outage. Is that probability high enough for the hospital? Assume the hospital needs both generators to fail less than 1% of the time when needed. (Round to four decimal places as needed.) Is that probability high enough for the hospital? Select the correct answer below and, if necessary, fill in the answer box to complete your choice. A. Yes, because both generators fail about % of the time they are needed, which is low enough to not impact the health of patients.

Solve the following quadratic-like equation. [ (y^2-5)^2+4(y^2-5)-32=0 ]

Wanda runs up a hill that makes an angle of 15.5 degrees above the horizontal. The hypotenuse of the hill is 221 meters long. If Wanda has a mass of 72 kg and she does this in 131 seconds, how many horsepower does she generate? 0.59 hsp 0.64 hsp 0.51 hsp 0.43 hsp

Use an integration by parts to calculate I = ∫ sin(ln(3x)) dx. Explain in details the choice of u and dv.

An astronaut weighs 1000 N on the surface of the Earth. She moves so that she is 3 radii from the center of the Earth. What is her new weight? O 34 N O 250 N O 111 N O 102 N

What is the distance from the center of the Moon to the point between Earth and the Moon where the gravitational pulls of Earth and Moon are equal? The mass of Earth is 5.97 × 10^24 kg, the mass of the Moon is 7.35 × 10^22 kg, the center-to-center distance between Earth and the Moon is 3.84 × 10^8 m, and G=6.67 × 10^-11 N · m^2 / kg^2. 4.69 × 10^6 m 3.84 × 10^7 m 3.83 × 10^6 m 4.69 × 10^7 m 3.45 × 10^8 m

The frequency distribution below represents frequencies of actual low temperatures recorded during the course of a 31-day month. Use the frequency distribution to construct a histogram. Do the data appear to have a distribution that is approximately normal? Class Frequency A 39-44 1 B 45-50 1 C 51-56 6 D 57-62 15 E 63-68 5 F 69-74 1 G 75-80 2 Do the data appear to have a distribution that is approximately normal? A. No, it is approximately uniform. B. Yes, it is approximately normal. C. No, it is not at all symmetric. D. No, it is completely erratic.

When an object with an electric charge of 0.770 mC is 90.0 m from an object with an electric charge of -0.890 mC, the force between them has a strength of 0.7604 N. Calculate the strength of the force between the two objects if they are 450 m apart. Be sure your answer has the correct number of significant digits.

Multiply. √(-5) · √(-14)

Look at the diagram below. The line NP and the line MQ will be dilated by a scale factor of 1/4 centered at M to create the line N'P' and the line M'Q, respectively. Select all of the true statements. - The line MQ' will be perpendicular to the line N. - The line N'P will be perpendicular to the line NP. - The line N'P will be parallel to the line NP, but they will not be the same line. - The line M'Q will be the same line as the line MQ.

Solve the system of equations by graphing: y=2x+8 y=-2x

The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally distributed, with a mean of 0.6 inch and a standard deviation of 0.005 inch. After recalibrating the production machine, the manager randomly selects 22 pistons and determines that the standard deviation is 0.0044 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the α=0.10 level of significance? What are the correct hypotheses for this test? The null hypothesis is H0 : The alternative hypothesis is H1 :

A rocket is launched so that it rises vertically. A camera is positioned 5000 ft from the launch pad. When the rocket is 1000 ft above the launch pad, its velocity is 520 ft / sec. Find the necessary rate of change of the camera's angle as a function of time so that it stays focused on the rocket.

The height of a body moving vertically is given by s = -(1/2) g t^2 + v0 t + s0, g > 0, with s in meters and t in seconds. Find the body's maximum height. Which of the following expressions gives the correct maximum height of the body? (v0)/(2 g) + s0 (v0^2)/g + s0 (v0^2)/(2 g) + s0 (v0)/g + s0

Lanzamos verticalmente hacia arriba un cuerpo a 20 m/s. Calcula cuánto tiempo le cuesta llegar al punto más alto y a qué altura subirá. g=-9,8 m/s^2

If two lines in space do not meet, they must be parallel.

Problemă rezolvată Un ciocan cu masa de 1 kg a fost transportat pe Lună. Calculează greutatea ciocanului pe Terra și pe Lună. Consideră acceleraţia gravitatională pe Pământ gp=9,8 N / kg, iar pe Lună gL=1,6 N / kg.

9.30 × 10^5 J 의 에너지가 0°C, 2.00 kg 의 얼음에 전달 된다고 가정 하자. (a) 그 얼음을 완전히 물로 녹이는 데 필요한 에너지를 계산 하라. (b) 액체 상태의 물의 온도를 높이기 위해 남은 에너지는 얼마인가? (c) 액체 상태의 물의 최종 섭씨 온도를 무하라.

Velocidade aerodinâmica (VA, VV ou TAS): - Calcule a velocidade aerodinâmica nas seguintes condições: - VI = 120kt; Alt = 7000ft; temp = 8°C: 135 kt - VI = 901t'; Alt = 5000ft; temp = 14°C: 98 Kt - VI = 135kt; Alt = 9500ft; temp = 4°C: 158 kt - VI = 120kt; Alt = 8500ft; temp = 0°C:

Po hrapavem klancu strmine 30° drsi večja klada mase 100 kg. Koeficient trenja med podlago in klancem je 0.2. Vrvica preko škripca povezuje večje telo z manjšim. (Upoštevaj, da sta dva sistema. Zato zapiši sistem enačb za obe telesi) a) Pravilno nariši sile na posamezen sistem (Ločiti moraš zunanje sile in komponente!). b) Kolikšno maso mora imeti viseče telo, da se obe telesi gibljeta s pospeškom 2 m / s^2?

Graph f(t) = t^2 + 3t - 4.

길이 I=1 m 인 줄에 질량 m=5 kg 의 추가 매달려 있다. 이 진자가 수평의 위치 OA 에서 초기속도 없이 놓아져서 수직 평면상을 움직인다. 추가 O 의 바로아래, C 를 지날 때의 속도가 Vc=4.429 m / s 로 주어진다. 줄의 무게와 공기 마찰은 무시한다. C 를 지날 때 추의 접선 방향 가속도의 크기를 구하시오.

Find an equation for the line tangent to the graph of y=tan^(-1)(1/2 x) at the point (2, pi/4). What is the tangent line to y=tan^(-1)(1/2 x) at the point (2, pi/4) ? y=

If θ = 9π/4, then sin(θ) equals 0.7071 cos(θ) equals 0.7071 tan(θ) equals 1 sec(θ) equals □

Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find P12, the 12th percentile. This is the bone density score separating the bottom 12% from the top 88% Which graph represents P12? Choose the correct graph below.

Two sides and an angle (SSA) of a triangle are given. Determine whether the given measurements produce one triangle, two triangles, or no triangle at all. Solve each triangle that results a=12, b=18.2, A=25° Selected the correct choice below and, if necessary, fill in the answer boxes to complete your choice. (Round side lengths to the nearest tenth and angle measurements to the nearest degree as needed.) A. There is only one possible solution for the triangle. The measurements for the remaining side c and angles B and C are as follows. B ≈ C ≈ c ≈ B. There are two possible solutions for the triangle. The measurements for the solution with the smaller angle B are as follows. B1 ≈ c1 ≈ c1 ≈ The measurements for the solution with the larger angle B are as follows. B2 ≈ c2 ≈ c2 ≈ 1 C. There are no possible solutions for this triangle.

If the differential equation [ m fracd^2 xd t^2+5 fracd xd t+2 x=0 ] is overdamped, the range of values for m is?

The figure to the right shows a container that is to be filled with water from the top. Assume that water is poured into the container at a constant rate and the container is filled in 10 s. Assume also that the horizontal cross sections of the container are always circles. Let h(t) be the depth of the water in the container at time t, for 0 ≤ t ≤ 10. Complete parts (a) through (d) below. a. Sketch a graph of the function y=h(t), for 0 ≤ t ≤ 10. Choose the correct graph below. A. B. C. D.

(a) Find parametric equations for the line through (4,2,4) that is perpendicular to the plane x-y+2z=2. (Use the parameter t.) (x(t), y(t), z(t))= (b) In what points does this line intersect the coordinate planes? xy-plane (x(t), y(t), z(t))= yz-plane (x(t), y(t), z(t))= xz-plane (x(t), y(t), z(t))=

Find the slope of the tangent line to the curve (4 x^2+1 x y-4 y^3=-12) at the point ((2,2)).

3. Which statement concerning the ozone layer is TRUE? The ozone layer provides a protective barrier from the Sun. The ozone layer has holes in it above the North Pole. The ozone layer is one of the five layers of the atmosphere. The ozone layer provides oxygen for life on Earth.

Here is a procedure used in a middle school science class to find the speed of sound in air. A student takes two erasers and begins to bang then together with a regular beat perhaps at a rate of 20 'claps' in 10 second - in front of the brick wall of the school building. The student begins walking backward until she can't hear the echo of the erasers anymore. Explain, in terms of the principles of waves explored in this Lesson, how this procedure is able to estimate the speed of sound in air.

Consider the following. (Assume that the coins are distinguishable and that what is observed are the faces or numbers that face up.) Three coins are tossed; the result is at most one tail. Which of the following sets of elements are included in the sample space? (Select all that apply.) TTH HIT HHT HTH HHH THH TIT THT

Oscillating frequency relation with R and C of the given circuit. Set the representative time constant of the circuit. Given that Rs = 470 kΩ, the lower resistance value of the first capacitor can be taken as mind of the test class. Separate your answer with commas.

Question 38 2 pts 38. Orographic lifting refers to a. convection stimulated principally by local heating b. lifting along the edges of conflicting air masses c. forced uplift due to the presence of a physical barrier d. none of the above

Which procedure enables examination of the entire small intestine by ingesting a pill-sized video capsule? Enterscopy Capsule Endoscopy Angiography Double Ballon Endoscopy

When a car moves forward, what forces make it to do so? Multiple Choice Gravity. Normal force from the road. Air resistance. Friction (forward direction) between the tires and the road and the engine force.

Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 15.5 L of water using your natural gas (primarily methane) stove. What volume of natural gas is needed to boil the water if only 19.7% of the heat generated goes towards heating the water. Assume the density of methane is 0.668 g / L, the density of water is 1.00 g / mL, and that the water has an initial temperature of 22.2°C. Enthalpy of formation values can be found in this table. Assume that gaseous water is formed in the combustion of methane.

Consider these reactions, where M represents a generic metal. 1. 2 M(s) + 6 HCl(aq) -> 2 MCl3(aq) + 3 H2(g) Delta H1 = -793.0 kJ 2. HCl(g) -> HCl(aq) Delta H2 = -74.8 kJ 3. H2(g) + Cl2(g) -> 2 HCl(g) Delta H3 = -1845.0 kJ 4. MCl3(s) -> MCl3(aq) Delta H4 = -257.0 kJ Use the given information to determine the enthalpy of the reaction 2 M(s) + 3 Cl2(g) -> 2 MCl3(s)

Find the magnitude of B in lb

When you're driving in the city, a traffic light turns from green to red. As your textbook discusses transduction: - the red light is a physical stimulus. - your sensory receptors translate the light into signals for the brain. - the light waves are detected by your eyes. - your brain constructs a representation of the stop light, which means "stop."

Find a positive angle and a negative angle that is coterminal to -5π/4. □ is a positive angle that is coterminal to -5π/4. □ is a negative angle that is coterminal to -5π/4. π

Solve the formula for the indicated variable. K=ma/F for F F=

A grinding wheel 0.31 m in diameter rotates at 2400 rpm Part A Calculate its angular velocity in rad/s. Express your answer using three significant figures. ω= rad / s Part B What is the linear speed of a point on the edge of the grinding wheel? Express your answer to two significant figures and include the appropriate units. v= Value Units

A sample of argon gas has a volume of 4.50 L at a pressure of 4.00 atm. The temperature and the number of gas particles do not change. Note: Reference the Conversion factors for non-SI units table for additional information. What is the volume of gas (in L) at 22.8 atm? Be sure your answer has the correct number of significant figures. L × 10

To answer this question, you may need access to the periodic table of elements, a calculator, and the equations and charts in the tutorial associated with this question. A typical barometric pressure in Denver, Colorado, is 615 mm Hg. What is this pressure in kilopascals? a.) 0.0080 kPa b.) 82.0 kPa c.) 4.67 × 10^5 kPa d.) 0.809 kPa

Suppose that a boat weighs 700 pounds and is on a ramp inclined at 30 degrees. Represent the force due to gravity, F, using F=-700 j as shown in the figure to the right. a. Write a unit vector along the ramp in the upward direction. b. Find the vector projection of F onto the unit vector from part a. c. What is the magnitude of the vector projection in part b? What does this represent? a. The unit vector along the ramp in the upward direction is u= (Simplify your answer. Type your answer in terms of i and j. Use integers or fractions for any numbers in the expression. Rationalize all denominators. Type an exact answer, using radicals as needed.)

A right angle is 90° = π/2 radians. If a right triangle has one angle measuring π/2 radians and a second measuring t radians. Find the third angle θ. Give your answer as a mathematical statement that includes the angle t

A long solenoid of radius r=2.00 cm is wound with 350 turns / m and carries a current that changes at the rate of 28.5 A / s as in Figure P20.60. What is the magnitude of the emf induced in the square conducting loop surrounding the center of the solenoid?

Calculate the energy required for the electronic transition from n=3 to n=5 in the hydrogen atom.

Convert 40 miles per hour (mph) to meters per second (m / s).

1. Why was it not possible to determine the charge of the electron by this method at the time when Thomson was doing his experiment? 2. A constant current of 0.800 A was used to deposit copper at the cathode of a cell. Calculate the grams of Cu deposited in minutes. 3. If the time and current are each uncertain by 1.0% and the mass of copper is uncertain by 0.10%, what is the uncertainty?

Enter the decimal equivalent of the exponent of the following floating point binary number. 1000001101.01100000000000000000000 Decimal exponent: Ex:10

Question 1 (1 point) 3 Torque is a moment that tends to twist a member about its longitudinal axis. True False

Refer to the accompanying screen display that results from measured hemoglobin levels (g/dL) in 100 randomly selected adult males. The confidence level of 95% was used. Complete parts (a) through (c). 95% confidence interval results Variable Sample Mean Std. Error. DF L. Limit U. Limit Hemoglobin 13.465 1.436 99 13.180 13.750 a. What is the number of degrees of freedom that should be used for finding the critical value tα/2? There are 99 degrees of freedom. (Type a whole number.) b. Find the critical value tα/2 corresponding to a 95% confidence level. tα/2=1.96 (Round to two decimal places as needed.)

Which process will double the power given off by a resistor? doubling the current while doubling the resistance doubling the current by making a resistance half as big doubling the current by doubling the voltage doubling the current while making the voltage half as big

In the long run the aggregate supply curve will be vertical, diagonal, a V-shape, horizontal.

As shown in the figure below, we have a square one meter on a side that is free to rotate about an axis perpendicular to the plane of the square, a distance a from one side and a distance b from the other side. Two forces, F1 and F2, are applied to diagonally opposite comers, and act along the sides of the square, first as shown in case (i) and then as shown in case (ii) of the drawing. In each case the net torque produced by the forces is zero. If the magnitude of F2 is 6 times that of F1, find the distances a and b that locate the axis. It should be noted that a and b are not drawn to scale. a= Since we need to calculate torques, see if you can write an expression for the torque in terms of the force producing that torque and the perpendicular distance between the line of action of the force and the point about which we wish to determine the torque. After equating the clockwise to the counterclockwise torques for each case and inserting the relationship between the magnitude of the forces, we have two equations and two unknowns (σ and b). To determine the value for a, see if you can manipulate these two equations in such a manner as to eliminate b and allow you to solve for a. b= Similar to your calculation of a, after equating the clockwise to the counterclockwise torques for each case and inserting the relationship between the magnitude of the forces, we have two equations and two unknowns (α and b). To determine the value for b, see if you can manipulate these two equations in such a manner as to eliminate a and allow you to solve for b.

For any nonzero vector v, the unit vector that has the same direction as v is . To find this vector, divide v by its magnitude.

y=e^(a x^2), y''

Vector A has magnitude a = 800 m and direction θ = 30.0°, whereas B has magnitude B = 400 m and θ = 210.0°. What is R = A + B? R = [ ]ˆi + [ ]ˆj m

What type of wave is a sound wave? A. Surface B. Electromagnetic C. Transverse D. Longitudinal

A diver jumps off a cliff 30 feet in the air into the ocean below. Her height above the water can be modeled by the function f(t)=-16 t^2+12 t+30, where t represents the time in seconds since she jumped. Use the given information to complete questions 6 through 10. 6. Write an equation that can be used to find the time it takes the diver to reach a height of 25 feet. 7. Solve the equation from question 6. Round to the nearest thousandth. 8. Are both solutions to this equation viable? Explain your thinking. 9. Interpret the solution to the equation in the context of the situation. 10. How long will it take before the diver hits the surface of the water? Round to the nearest thousandth.

La bala B tiene el doble de masa que la bala A. Ambas se disparan de modo que la bala B tiene el doble de rapidez que la bala A. Si la energía cinética de la bala 1 es K, entonces la energía cinética de la bala 2 es: a. 2 K b. 8 K c. 0.25 K d. 4 K

How does conduction transport heat through a steel rod that is placed in a fire? A. Energy spreads from one end of the rod to the other through molecular collisions. B. Hot steel molecules move down the molecular matrix toward the cool end of the rod. C. Waves of electromagnetic energy travel down the steel rod from one end to the other. D. Higher velocities of warmer steel molecules cause them to travel from one end to the other.

When an object with an electric charge of -40 μC is 5.0 cm away from an object with an electric charge of -30 μC, the electric potential energy of this system when the objects are 2.5 cm apart. Calculate the electric potential energy of this system when the objects are 2.5 cm apart. Be sure your answer has a unit symbol and the correct number of significant digits.

V=-1800 Z1 N Z2 Z3 Z4 Encuentre V.I, P.Q en Ω Z1 = 3550° Z2 = 4060° Z3 = 36-25° Z4 = 62-30°

A small rock sits on the edge of a tall building. A strong wind blows the rock off the edge. The distance, in feet, between the rock and the ground t seconds after the rock leaves the edge is given by d=-16t^2-5t+470. If the answer is not an integer, enter it as a decimal. Round to the nearest hundredth, if needed. How many seconds after the rock leaves the edge is it 449 feet from the ground? seconds How many seconds after the rock leaves the edge does it hit the ground? seconds

QUESTION 21 How much of a change in the membrane potential is necessary for the summation of postsynaptic potentials to result in an action potential being generated? +10 mV -30 mV +30 mV -100 mV +15 mV QUESTION 22 A channel opens on a postsynaptic membrane that causes a negative ion to enter the cell. What type of graded potential is this? repolarizing non-polarizing summating hyperpolarizing depolarizing

Exam 3 Item 11 Part A In unconsolidated materials, the angle of repose is . 25°-40° greater than 40° less than 25° 15°-25° 40°-75° Submit Request Answer

Two speakers are driven exactly out of phase with each other at 256 Hz. If a microphone placed on the line between the two speakers, exactly in the middle, detects no sound at all, then what is possibly the distance between the microphone and each speaker? The speed of sound is 340 m / s. Multiple Choice 0.94 m 0.38 m 0.75 m 1.50 m Can be any distance at all

Which of the following pressures must remain negative to prevent lung collapse? Atmospheric pressure Thoracic wall Parietal pleura Visceral pleura Pleural cavity Transpulmonary pressure Diaphragm Intrapulmonary pressure intrapleural pressure atmospheric pressure intrapulmonary pressure

Find the length of EH . a. 3 b. 9 c. 21 d. 42

Multiple Choice Question Which type of diabetes is characterized by insulin resistance and often associated with obesity? Type 1 diabetes Type 2 diabetes

The incubation time for a breed of chicks is normally distributed with a mean of 22 days and standard deviation of approximately 3 days. Look at the figure below and answer the following questions. If 1,000 eggs are being incubated, how many chicks do we expect will hatch in the following time periods? (Note: In this problem, let us agree to think of a single day or a succession of days as a continuous interval of time. Assume all eggs eventually hatch.) (a) in 16 to 28 days chicks (b) in 19 to 25 days chicks (c) in 22 days or fewer chicks (d) in 13 to 31 days chicks

When a 2.30-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.46 cm. (a) What is the force constant of the spring? N / m (b) If the 2.30-kg object is removed, how far will the spring stretch if a 1.15-kg block is hung on it? cm (c) How much work must an external agent do to stretch the same spring 8.40 cm from its unstretched position? J

A constant force F=-1 i+2 j-1 k is applied to an object that is moving along a straight line from the point (-5,4,4) to the point (3,-4,-4). Find the work done if the distance is measured in meters and the force in newtons. Include units in your answer. (Note, units are case sensitive. Clicking on the link units will give a list of units.) Answer =

R^2 is a value that is used to determine the strength of a linear fit. True False

The graph of the first derivative is given below. Give the intervals of increase and decrease of f.

Part 3. The luminosity and mass for main sequence stars are connected: L ~ M^3.5 Question #6. (2 points) A star with a mass of 2 M⊙ has a luminosity of 11.3136 L⊙ while a star with luminosity of 3,160 L⊙ has an approximate mass of M⊙.

Question 24 let (f(x)=frac1x+9). (a) Determine the difference quotient and simplify. [ fracf(x+h)-f(x)h= ] (b) Determine (f^prime(x)) by letting (h rightarrow 0) in part (a). [ f^prime(x)= ]

How much work would be required to move a satellite of mass m from a circular orbit of radius r1=2 rE about the Earth to another circular orbit of radius r2=3 rE ? ( rE is the radius of the Earth.) Express your answer in terms of the variable m and constants rE, ME, and G.

For a current transformer iL/iS = TP/TS. a. Solve for iL. b. Solve for IS c. Find iL when iS=1.5 amperes, TP=1600, and TS=100. iL = (TS iS)/TP iL = TS/(TP iS) iL = TP/(TS iS) iL = (TP iS)/TS

Newton's Law of Cooling says that the rate at which a body cools is proportional to the difference C in temperature between the body and the environment around it. The temperature f(t) of the body at time t in hours after being introduced into an environment having constant temperature T0 is f(t)=T0+Ce^(-kt), where C and k are constants. A cup of coffee with temperature 135°F is placed in a freezer with temperature 0°F. After 10 minutes, the temperature of the coffee is 60°F. Use Newton's Law of Cooling to find the coffee's temperature after 20 minutes. After 20 minutes the coffee will have a temperature of °F. (Round to the nearest integer as needed.)

The piano slides 2.6 m down a 23° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure(Figure 1)). Ignore friction. Previous Answers Correct Part C Determine the work done on the piano by the force of gravity. Express your answer to two significant figures and include the appropriate units. WG = 3700 J Previous Answers Correct Part D Determine the net work done on the piano. Express your answer to two significant figures and include the appropriate units. Wnet Value Units

Why do symptoms of asthma increase during exercise?

A type of chronic obstructive pulmonary disease characterized by destruction of the alveolar walls is ? emphysema cystic fibrosis chronic bronchitis asthma

Part 3 of 5 Points: 0 of 1 A particular IQ test is standardized to a Normal model, with a mean of 100 and a standard deviation of 13. a) Choose the model for these IQ scores that correctly shows what the 68-95-99.7 rule predicts about the scores. A. B. C. b) In what interval would you expect the central 68% of the IQ scores to be found? Using the 68-95-99.7 rule, the central 68% of the IQ scores are between 87 and 113. (Type integers or decimals. Do not round.) c) About what percent of people should have IQ scores above 126? Using the 68-95-99.7 rule, about % of people should have IQ scores above 126. (Type an integer or a decimal. Do not round.)

A spring with a mass on the end of it hangs in equilibrium a distance of 63.4 cm above the floor. The mass is pulled down a distance 9 cm below the original position, released, and allowed to oscillate. How high above the floor, in cm , is the mass at the highest point in its oscillation? Please round your answer to one decimal place.

The highest pressure measured in Jupiter's upper atmosphere by the Galileo probe is 22 atm. Calculate the highest pressure measured in kPa. Round answer to 2 significant digits.

Find the exact value of the expression. [ cos ^-1left(sin frac7 pi6right) ] Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. (cos ^-1left(sin frac7 pi6right)=) (Simplify your answer. Type an exact answer, using (pi) as needed. Use integers or fractions for any numbers in the expression.) B. There is no solution.

7. When you change the frequency, how does the sound change? 8. How does the frequency change the model that you see when you change it (include a diagram)? 9. How does changing the amplitude affect the sound you hear and the model you see?

Which choice shows the correct airflow pattern for the Southern Hemisphere? High and low pressure are shown marked as "High" and "Low"

Problem 8: (8% of Assignment Value) In the figure, the point charges are located at the corners of an equilateral triangle 27 cm on a side. Part (a) Find the magnitude of the electric field, in newtons per coulomb, at the center of the triangular configuration of charges, given that qa=2.2 nC, qb=-5.5 nC, and qc=1.6 nC. E= N / C

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