Carnot Engine: The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°C as the hot temperature reservoir, and the water at some depth, with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures?
A. 4.7%
B. 5.1%
C. 7.9%
D. 15%
E. 30%
Answer: B
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A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
A) 1400 million years B) 2100 million years C) 700 million years D) 350 million years
The footprints left on the moon by the Apollo astronauts will likely last for
A) millions of years. B) no time; they were quickly erased by micrometeorites. C) the remaining existence of the Moon. D) a few decades.
A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound to be 340 m/s. What frequency does the whistle actually produce?
A) 444 Hz B) 439 Hz C) 364 Hz D) 361 Hz
Magenta, yellow, and cyan are the colors used in ________ color mixing.
What will be an ideal response?