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

Physics & Space Science

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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

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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.

Physics & Space Science

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

Physics & Space Science

Magenta, yellow, and cyan are the colors used in ________ color mixing.

What will be an ideal response?

Physics & Space Science