AP (Advanced Placement) Physics(B-C): Questions 356 - 358 of 920

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Question number: 356

» Thermodynamics

MCQ▾

Question

A block of metal at is brought into contact with a block of the same metal at . Assuming no loss of energy to the environment around the blocks, which of the following statements is true regarding the temperatures of the blocks after a long time has passed?

Choices

Choice (5) Response

a.

The final temperatures of the blocks can only be the same if the two blocks are made of the same materials.

b.

The temperatures of the two blocks will be the same, so all molecules will have the same average speed.

c.

The temperatures of the two blocks will be the same, so all molecules will have the same average kinetic energy.

d.

The final temperature of each block will be , because the blocks will reach thermal equilibrium.

e.

All of the above

Question number: 357

» Work, Energy and Power

MCQ▾

Question

A box with a mass of and initially moving at slides a distance of across a rough floor to a stop. Which of the following values best estimates the coefficient of friction between the box and the floor?

Choices

Choice (5) Response

a.

0.05

b.

0.1

c.

0.4

d.

0.2

e.

All of the above

Question number: 358

» Linear Momentum

MCQ▾

Question

Which of the following statements is NOT always true for change in linear momentum of a system?

Choices

Choice (5) Response

a.

A net external force must be exerted on the system.

b.

Either or both the magnitude and direction of momentum change.

c.

The center of mass of the system changes position.

d.

There is a change in the velocity of the system.

e.

Question does not provide sufficient data or is vague

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