An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is
A) 0.1 s.
B) 1 s.
C) 10 s.
D) 20 s.
E) more than 20 s.
Answer: E
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All the following statements are true. Which one follows directly from Kepler's third law (p2 = a3)?
A) Venus orbits the Sun at a slower average speed than Mercury. B) Venus is more massive than Mercury. C) Venus takes longer to rotate than it does to orbit the Sun. D) Venus has a thicker atmosphere than Mercury.
Suppose Earth collapsed down to one-hundredth [1/100] of its present radius. How would this affect your weight? Your weight would be
A) increased by a factor of 100. B) increased by a factor of 1000. C) increased by a factor of 10,000. D) unchanged. E) reduced by a factor of 100.
Mercury is still geologically active today
a. True b. False Indicate whether the statement is true or false
In one cycle of any heat engine
A. more heat flows from the engine than enters the engine. B. the internal energy of the engine does not change. C. the net heat flow is zero. D. the net work done is larger than the heat exhausted.