When the magnitude of both interacting charges is increased by a factor of 2, the electrical forces between these charges is
A) doubled.
B) quadrupled.
C) reduced by a factor of 3.
D) reduced by a factor of .
E) reduced by a factor of 4.
B
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The relative humidity is 100% when
a. the psychrometer wet-bulb temperature is depressed. b. the actual moisture content is equal to the maximum moisture capacity. c. the air temperature is above the dew point temperature. d. the air temperature is 100°F.
To estimate the distance in kilometers of a flash of lightning, count the number of seconds between seeing the flash and hearing the accompanying thunder, then divide by
A) 2. B) 3. C) 4. D) 5. E) none of the above
Newton's version of Kepler's third law states: p2 = × a3 Solve this equation to find the combined mass of a planet and its satellite, given the orbital period and average separation.
A) M1 + M2 = 4G?2 × B) M1 + M2 = × C) M1 + M2 = × D) M1 + M2 = ×
Harlow Shapley found the Milky Way was
A) uniformly spherical in shape. B) rapidly expanding. C) much smaller than previously thought. D) centered on the Earth. E) much larger than previously thought.