The unit of work, joule, is dimensionally the same as:
a. newton/second.
b. newton/kilogram.
c. newton-second.
d. newton-meter.
d
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Two harmonic waves are described by 
What is the phase (in rad) of the resultant wave when x = t = 0?
A. 3 B. 0 C. 2 D. 1 E. 4
What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming hotter and brighter. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It expands, becoming bigger but dimmer.
A boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore. As a consequence, the raft (Hint: use conservation of momentum.)
1.remains stationary. 2.moves away from the shore. 3.moves toward the shore.
Consider our Moon, a white dwarf, and a neutron star. Which of the following lists them in the correct order of size (diameter), from smallest to largest?
A) neutron star, Moon, white dwarf B) Moon, white dwarf, neutron star C) white dwarf, neutron star, Moon