A "short circuit" is best described as
A) a high voltage that is not connected to an electrical circuit.
B) a low resistance placed across a high voltage.
C) an electrical circuit with a very high voltage.
D) an electrical circuit with a very high resistance.
E) a high resistance placed across a low voltage.
B
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If Earth's atmosphere had no greenhouse gases, then Earth's average surface temperature would be
A) well below the freezing point of water. B) about the same as it is now. C) slightly cooler, but still above freezing. D) slightly warmer, but still well below the boiling point of water.
Three cars (car F, car G, and car H) are moving with the same velocity when the driver suddenly slams on the brakes, locking the wheels. The most massive car is car F, the least massive is car H, and all three cars have identical tires
(a) Which car travels the longest distance to skid to a stop? A) Car F B) Car G C) Car H D) They all travel the same distance in stopping. (b) For which car does friction do the largest amount of work in stopping the car? A) Car F B) Car G C) Car H D) The amount of work done by friction is the same for all cars.
Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
GIVEN
? Two radiant shields placed in the evacuated space between two infinite planes
? Temperature of the planes
? T1 = 555 K
? T4 = 278 K
? Emissivity of all surface (?) = 0.8
FIND
? The steady state temperatures of the shields (T2, T3)
ASSUMPTIONS
? All surfaces are gray and diffuse
SKETCH
Venus has a higher average surface temperature than Mercury. Why?
A) because its surface is covered with hot lava from numerous active volcanoes B) because its slow rotation gives it more time to heat up in sunlight C) because it is closer to the Sun D) because its surface is heated by an extreme greenhouse effect