If a constant net force is applied to a body, the body is
1) accelerating.
2) moving at constant speed.
3) at rest or moving at constant velocity.
If a body is moving at constant velocity, it must have
4) a constant net force acting upon it.
5) constant non-zero acceleration.
6) constant speed.
7) none of the above.
Answer: 1, 6
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a. stays the same b. increases c. decreases d. cannot be determined
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg • m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg, are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s
A Carnot cycle, operating as a heat engine, consists, in the order given, of
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