Which of the following most likely explains why Jupiter's interior releases so much heat?
A) Jupiter is contracting very gradually
B) heat from radioactive decay
C) a slow rate of nuclear fusion in Jupiter's core
D) tidal heating
A
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According to Einstein, gravity is
A) the bending of space that is caused by masses. B) the force that masses exert on each other. C) caused by the electromagnetic force. D) due only to velocity. E) due only to acceleration.
When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy. b. mgnVdy. c. mgAdy. d. mgnVAdy. e. mgnVAPdy.
Which of the following is not one of the three basic types of materials emitted when a volcano erupts?
a. Lava b. Breccia c. Gas d. Pyroclastics
Rotation curves for spiral galaxies show:
A) they are slowing down. B) rotation speed drops off further from the nucleus. C) most have dark halos. D) most of the mass lies in the nucleus. E) no relation to mass.