In a nuclear power plant, the reactor produces 500°C steam that is used to power the steam turbines which generate 1500 MW of electrical power. The cooling tower eliminates the waste heat at 50°C. If the efficiency of the plant were that of a Carnot engine, at what rate would waste heat be vented to the atmosphere?
1080 MW
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If the Moon is setting at noon, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find
(a) the horizontal component of its velocity. (b) the speed with which it is moving.
Below the Curie temperature barium titanate is ferroelectric, and above the Curie temperature barium titanate is _________.
Fill in the blank(s) with the appropriate word(s).
Suppose you receive a message from a starbase that is 13.0 light-years from earth. The message is dated July 15, 2127. What year does your calendar indicate at the time of reception if your calendar and the station’s calendar are correctly synchronized?
A. 2127 B. 2114 C. 2140 D. Other (specify)