A shock wave is produced when the speed of an object
A) matches the speed of sound in air.
B) exceeds the speed of sound in air.
C) greatly increases in amplitude.
D) none of the above
Answer: B
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In a nuclear power plant, the reactor produces 500°C steam that is used to power the steam turbines which generate 1 500 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?
Radioactive Decay: Today, uranium contains 0.72% 235U (half-life = 0.70 billion years) and 99.28% 238U (half-life = 4.5 billion years). At a time 1.9 billion years ago, what was the fraction of 235U in uranium?
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