Today, an average lunar moonquake releases about as much energy as
A) an atomic bomb.
B) a firecracker.
C) a major U.S. city uses in 1 year.
D) the Mount St. Helens eruption.
E) the most powerful earthquake ever recorded.
B
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Most of the energy emitted by the Sun is generated in the
a. corona. b. photosphere. c. chromosphere. d. core.
Suppose we hold a sample of helium gas at a constant temperature while we slowly compress it in a cylinder until its volume has decreased by a factor of 4. During this process, the gas’s entropy
A. increases. B. decreases. C. remains the same. D. Does something else (specify).
An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
a. The astronaut must abandon the chamber immediately to avoid being electrocuted. b. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials. c. The astronaut does not need to worry: the charge will remain on the outside surface. d. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air. e. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.
An unconformity can be interpreted as
A) an occurrence of radioactive decay. B) repeated intrusions of igneous rock. C) a buried surface of erosion. D) the result of repeated volcanic action.