Conditions for the preservation of fossils are best achieved
A) in desert environments.
B) in glaciated environments.
C) in shallow river beds.
D) on the floors of shallow seas.
Answer: D
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Heat Engines: A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal.(a) What is the efficiency of this engine?(b) How much work does this engine do per cycle?
Fill in the blank(s) with the appropriate word(s).
The slopes of Olympus Mons are relatively free of impact craters. What does this imply about its history?
A. Olympus Mons has erupted in the last 250 million years. B. Olympus Mons was once submerged in water. C. The mountain is tall enough to be eroded by planetary dust storms. D. It is one of the oldest features on Mars.
The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both ends is 200. m/s. Which one of the following is not a resonant frequency of this string?
A) 50 Hz B) 200 Hz C) 25 Hz D) 100 Hz
What is the approximate luminosity of a main-sequence M star?
A) 10?6 solar B) 1 solar C) 10 solar D) 0.01 solar