Suppose that a given amount of work is required to crush an aluminum can and you can crush a can by dropping a rock on it from height h on the Earth. On the moon, from approximately what height must you drop the same rock to crush a can?
A. h
B. 3h
C. 6h
D. 9h
C. 6h
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What are two advantages of large scopes over smaller ones?
A) Large scopes have a larger field of view and sharper focus. B) Large scopes are not subject to atmospheric turbulence and opacity like smaller ones. C) Large scopes are easier to mount and control than small ones. D) Large telescope have more light grasp and better resolution. E) Large telescopes give higher magnification and are easier to build.
The gain in speed each second for a freely-falling object is about
A) 0 m/s. B) 5 m/s. C) 10 m/s. D) 20 m/s. E) depends on the initial speed.
According to the impulse-momentum relationship Ft = change in mv, a falling baseball hits a player with a force F. The t in the equation is the time
A) the ball falls before hitting the player. B) of contact of the ball hitting the player. C) of reflex as the player responds to being hit. D) all of the above E) none of the above
A box is placed on a table which rests on the floor. The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor
A) True B) False