The similarity that Newton recognized between a falling apple and the moon was
A) the force on both is directed toward Earth's center.
B) both have an acceleration that is directed toward the center of Earth.
C) Both of the above.
D) Actually there is no important similarity between these two.
E) None of the above.
C
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Nuclear Reactions: In the nuclear reaction 
H + 
H ? X + 
He, what is X?
A. 2 protons B. 2 neutrons C. 2H D. 3H E. alpha particle
Which of the following web video formats is a common format used by digital video cameras?
A. .avi B. .mov C. .mpeg D. .wmv
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 2, when it is undergoing convective contraction, and its life track moves almost straight down on the HR diagram?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
If a K0 meson at rest decays in 0.90 × 10^-10 s, how far will a K0 meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 10^8 m/s)
a. 2.6 cm c. 9.3 cm b. 8.2 cm d. 13 cm