Shown are four figures that represent the heat flow in a heat engine. The thickness of the arrows represents the amount of heat flow. TH is the high-temperature reservoir, TC is the low-temperature reservoir, QH is heat to/from TH, QC is heat to/from TC, and W is work. Which figure best represents a real heat engine?
A. A
B. B
C. C
D. D
Answer: B
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Halley's Comet last passed Earth in 1986. It will be due back in:
A) 2012. B) 2048. C) 2061. D) 2086. E) the twenty-third century.
Which explanation best describes why Earth observers always see the same face of the moon?
A) The Moon's rate of spin matches the rate at which the Moon revolves around Earth. B) The Moon does not rotate as it circles Earth. C) We tend only to observe the Moon at night, not during the day. D) Earth and Moon are partially gravity locked.
How many sterilizing impacts have occurred on the Earth since the heavy bombardment?
A) several during the last 500 million years B) many throughout the Earth's history C) none D) one, 65 million years ago
A tiny object carrying a charge of +3.00 ?C and a second tiny charged object are initially very far apart
If it takes of work to bring them to a final configuration in which the +3.00 ?C object i is at x = 1.00 mm, y = 1.00 mm, and the other charged object is at x = 1.00 mm, y = 3.00 mm, find the magnitude of the charge on the second object. (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 2.15 ?C B) 4.30 ?C C) 10.74 ?C D) 4.30 nC