The term light year describes a measurement of _____.
A. Distance
B. Prior experiences
C. Limited course offerings
D. Poverty
Ans: A. Distance
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Impulse: A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.050 s. What is the magnitude of the average force exerted on the wall by the ball?
A. 800 N B. 400 N C. 55,000 N D. 27,500 N E. 13,750 N
A photon hitting an electron (mass m) at rest can create an electron–antielectron pair in addition to the original electron. Assume that the two electrons and the positron move away from the collision at rest with respect to each other afterward. What was the photon’s initial energy?
A. Zero B. m C. 2m D. 3m E. 4m
The overall dimming of starlight by interstellar matter is called:
A) extinction. B) reddening. C) absorption. D) emission. E) scattering.
The half-life of 30P is 2.50 minutes. If a sample of 30P has 
nuclei present, what is its activity?
a. 
b. 
c. 
d. 
e. 