When an ideal gas is expanded in volume at constant pressure, the average kinetic energy of the gas molecules
A) increases.
B) decreases.
C) does not change.
D) may either increase or decrease, depending on whether or not the process is carried out adiabatically.
E) may or may not change, but insufficient information is given to make such a determination.
A
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A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coefficient of kinetic friction between the block and the surface is 0.20 . At what rate is the force P doing work on the block at t = 2.0 s?
a. 54 W b. 49 W c. 44 W d. 59 W e. 24 W
Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified. B) Dark matter consists primarily of a mysterious form of energy that is causing the expansion of the universe to accelerate. C) There is no longer any doubt that dark matter is made mostly of WIMPs. D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.
Your feet feel warmer on a rug than on a tile floor because the rug
a. is usually warmer than the tile b. is a better insulator than tile c. has more internal energy than tile for the same mass d. all of these
The drawing below is supposed to be a free-body diagram of a box that sits without slipping on the back of a truck that is moving to the right but is slowing down. Is the diagram correct?
A. Yes.
B. No, 
should point leftward.
C. No, the label should be .
D. No, there should be a leftward drag force.
E. No, 
should not be equal to 
.
F. No, there is some other problem (specify).