From a latitude of 60ºN during the winter, the Sun will
A) spend most of each day below the horizon.
B) spend most of each day above the horizon.
C) never be seen above the horizon.
D) spend a few weeks continuously below the horizon.
A) spend most of each day below the horizon.
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Uranus and Neptune appear blue or blue-green because
a. their atmospheres absorb blue light very efficiently. b. their solid air-less surfaces are this color c. their surfaces are covered with liquid water with no atmosphere d. traces of methane in their atmospheres absorb red light very efficiently.
Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half way between the two plates the electric field has magnitude E
If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates? A) 4E B) 2E C) E D) 0 E) E/2
A 20-?F capacitor charged to 2.0 kV and a 40-?F capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-?F capacitor after the two are so connected?
a. 53 mC b. 27 mC c. 40 mC d. 80 mC e. 39 mC
An ideal heat engine is operating between high and low temperature reservoirs. Suppose that now the low temperature reservoir has its temperature lowered, but no other changes are made. This temperature change affects the engine efficiency in which of the following ways?
A. The efficiency increases B. The efficiency is unchanged C. The efficiency decreases D. There is now no way to calculate the efficiency