An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?
A) It changes, but it is impossible to tell which way.
B) It increases.
C) It does not change.
D) It decreases.
B
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The total kinetic energy in one mole of an ideal gas is 4,000 J. What is the average kinetic energy of an individual particle in the ideal gas?
a. 
b. 
c. 
d. 
e. 
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a. True b. False Indicate whether the statement is true or false
Slanting Surfaces Without Friction: A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the figure. The string pulls on the 15-kg block parallel to the surface of the ramp. Find the magnitude of the acceleration of the 19-kg block after the system is gently released?
A. 4.0 m/s2 B. 3.8 m/s2 C. 4.2 m/s2 D. 4.5 m/s2