A box sits at rest on an inclined plank. How do the magnitudes of the normal force and the gravitational force exerted on the box compare? (Hints: What is the box’s acceleration? Draw a free-body diagram!)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
A.
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According to the ages of the globular clusters, our Galaxy is about ________ times as old as the solar system
Fill in the blank(s) with correct word
A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample?
A) It does not change. B) It quadruples. C) It doubles. D) It halves. E) none of the above
Today most scientists favor the capture theory of the Moon's origin, since it would explain why the Moon still orbits in the ecliptic plane, as do other planets
Indicate whether the statement is true or false
A person with normal eyesight uses a converging lens of focal length 10 cm as a magnifying glass to finish an engraving job. To see detail, he holds the lens very close to his eyes. At what minimum distance from the job must he hold the lens?
A) 20 cm B) 30 cm C) 14 cm D) 9.4 cm E) 7.1 cm