Which of the following is an almost reversible process?
a. The explosion of hydrogen and oxygen to form water.
b. Heat transfer through thick insulation.
c. The adiabatic free expansion of a gas.
d. A slow isothermal compression of a gas.
e. A slow leakage of gas into an empty chamber through a small hole in a membrane.
d
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The flow of a glacier begins
A) after it has reached a critical mass. B) as pressure is exerted from behind. C) when the accumulating snow begins to melt. D) in the spring.
When does the new Moon phase occur?
A. when Earth is between the Sun and the Moon B. when the Moon is between Earth and the Sun C. when the Sun is between Earth and the Moon D. when the Sun and the Moon are on the Celestial Equator
What is the goal of comparative planetology?
A) to use planetary positions to foretell the future B) to find which planets will be most suitable for future colonization C) to help plan future visits by unmanned probes, orbiters, and rovers D) to determine the origin and evolution of the solar system E) to find out how our own solar system compares with extrasolar ones
If the Sun suddenly stopped emitting neutrinos, what might we infer (after checking that our neutrino detectors were still operational)?
A) Fusion reactions in the Sun ceased a few hundred thousand years ago. B) Fission reactions in the Sun have ceased. C) Fusion reactions in the Sun have ceased. D) The Sun has exhausted its supply of neutrinos.