The force that holds atoms together to form molecules is
1) electric,
2) magnetic,
3) gravitational,
4) nuclear,
and the force that holds the protons in a nucleus together is
5) electric.
6) magnetic.
7) gravitational.
8) nuclear.
Answer: 1, 8
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Suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would not have any effect on our estimate of the distance to the Andromeda Galaxy. B) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought. D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (?x) cos (3?t) where x is in m and t is in s. What is the distance (in m) between the first two antinodes?
a. 8 b. 2 c. 4 d. 1 e. 0.5
The resistance of the light bulb is __________
Fill in the blank(s) with correct word
A diver, below the surface of a lake, notices that no light appears to be coming toward her greater than the angle 
measured from the vertical. If the index of refraction of water is 1.33, what is the angle 
A. 
B. 
C. 
D. 
E. 