Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
a. it has the same position and velocity as ball B.
b. it has the same position and acceleration as ball B.
c. it has the same velocity and acceleration as ball B.
d. it has the same displacement and velocity as ball B.
e. it has the same position, displacement and velocity as ball B.
b
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A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 6.0 m, and then stops. What is the magnitude of the average acceleration?
a. 2.1 m/s2 c. 5.4 m/s2 b. 4.2 m/s2 d. 6.2 m/s2
A horizontal force of 200 N is applied to a 55-kg cart across a 10 m level surface. If the cart accelerates at 3.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. -900 J c. -350 J b. -175 J d. -700 J
The meaning of the phrase "space is relative" is that
A) all observers measure the same speed for a lightbeam. B) two observers, both in the same reference frame, observe different lengths for different objects. C) two observers, in different reference frames, observe different lengths for different objects. D) two observers, in different reference frames, observe different lengths for the same object. E) two observers, both in the same reference frame, observe different lengths for the same object.
The chemical abundance of population I stars
a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.