The Moon, Mercury, and Mars do not have plate tectonics because
A) they have cooled so rapidly that they do not have enough internal convection to break up their thick crusts
B) they have no oceans for subduction and seafloor spreading to occur in
C) impacts have filled in the plate boundaries essentially turning the process off
D) their crusts have dried up and thickened so the crust cannot be broken up into plates
A
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Warm air rises because faster moving molecules tend to move to regions of less
A) density. B) pressure. C) both of these D) none of the above
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours. The most likely explanation is that
A) the star is a Cepheid variable. B) the star is a member of an eclipsing binary star system. C) the star is periodically ejecting gas into space, every 73 hours. D) the star is a white dwarf.
Even with perfect optics, what is the resolution limit (in radians) of the Hubble Space Telescope when it is focusing light of wavelength 400 nm? The mirror diameter is 2.4 m
What will be an ideal response?
The temperature of a sample of a substance is a way to gauge
A. the kinetic energy of the fastest moving molecule in the sample. B. the average momentum of the fastest 50% of the molecules in the sample. C. the average kinetic energy of the molecules in that sample. D. the average momentum of the molecules in a sample.