Questions: Question 12 (1 point) Two metal bricks are held off the edge of a balcony from the same height above the ground. The bricks are the same size but one is made of Titanium (density of 4.5 g / cm^3 ) and one is made of Lead (density of 11.3 g / cm^3 ) so the Lead is about twice as heavy as the Titanium. The time it takes the bricks to reach the ground will be: less but not necessarily half as long for the lighter brick less but not necessarily half as long for the heavier brick about the same time for both bricks about half as long for the lighter brick about half as long for the heavier brick Question 13 (1 point) A fully loaded delivery truck collides head-on with a small car heading the opposite direction. The force of the truck on the car will be Fton and the force of the car on the truck will be Fcont. What expression best describes the magnitudes of the forces exerted on the two vehicles. Ftnor=Fconet

Question 12 (1 point) Two metal bricks are held off the edge of a balcony from the same height above the ground. The bricks are the same size but one is made of Titanium (density of 4.5 g / cm^3 ) and one is made of Lead (density of 11.3 g / cm^3 ) so the Lead is about twice as heavy as the Titanium. The time it takes the bricks to reach the ground will be: less but not necessarily half as long for the lighter brick less but not necessarily half as long for the heavier brick about the same time for both bricks about half as long for the lighter brick about half as long for the heavier brick Question 13 (1 point) A fully loaded delivery truck collides head-on with a small car heading the opposite direction. The force of the truck on the car will be Fton and the force of the car on the truck will be Fcont. What expression best describes the magnitudes of the forces exerted on the two vehicles. Ftnor=Fconet
Transcript text: Question 12 (1 point) Two metal bricks are held off the edge of a balcony from the same height above the ground. The bricks are the same size but one is made of Titanium (density of 4.5 $\mathrm{g} / \mathrm{cm}^{3}$ ) and one is made of Lead (density of $11.3 \mathrm{~g} / \mathrm{cm}^{3}$ ) so the Lead is about twice as heavy as the Titanium. The time it takes the bricks to reach the ground will be: less but not necessarily half as long for the lighter brick less but not necessarily half as long for the heavier brick about the same time for both bricks about half as long for the lighter brick about half as long for the heavier brick Question 13 (1 point) A fully loaded delivery truck collides head-on with a small car heading the opposite direction. The force of the truck on the car will be $F_{t \text { ton }}$ and the force of the car on the truck will be $F_{c \text { on } t}$. What expression best describes the magnitudes of the forces exerted on the two vehicles. $\mathrm{F}_{\text {tnor }}=\mathrm{F}_{\text {conet }}$
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Solution

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Solution Steps

Step 1: Determine the effect of mass on falling time
  • According to the principles of physics, specifically Galileo's law of falling bodies, the time it takes for an object to fall to the ground under gravity is independent of its mass.
  • Both bricks are subject to the same gravitational acceleration (\( g \)).
Step 2: Conclusion for Question 12
  • Since the time to fall is independent of mass, both bricks will take about the same time to reach the ground.
  • The correct answer is: "about the same time for both bricks".
Step 3: Newton's Third Law for Question 13
  • Newton's Third Law states that for every action, there is an equal and opposite reaction.
  • Therefore, the force exerted by the truck on the car (\( F_{t \text{ on } c} \)) is equal in magnitude to the force exerted by the car on the truck (\( F_{c \text{ on } t} \)).
Step 4: Conclusion for Question 13
  • The correct expression is: \( F_{t \text{ on } c} = F_{c \text{ on } t} \).

Final Answer

For Question 12: \(\boxed{\text{about the same time for both bricks}}\)
For Question 13: \(\boxed{F_{t \text{ on } c} = F_{c \text{ on } t}}\)

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