Which mission has recently provided scientists with information about Mercury's magnetic field?
a. Magellan
b. MESSENGER
c. LCROSS
d. Voyager
e. Apollo
b
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The spectrum of the Sun is:
A) not observable in the visible range B) a continuous spectrum with no absorption lines C) an emission spectrum D) an absorption spectrum E) a spectrum containing emission and absorption lines but no continuum
In an engine operating in the Otto cycle, the final volume of the fuel-air mixture is one sixth the initial volume. Assume ? = 1.4 . The maximum theoretical efficiency of this cycle is
a. 17%. b. 49%. c. 51%. d. 56%. e. 83%.
What is one of the differences between Cepheids and RR Lyrae variables?
A) The period-luminosity relation holds only for RR Lyrae stars. B) The pulsations of RR Lyrae stars are much less regular than those of Cepheids. C) Cepheids are giants, but RR Lyrae stars are still on the main sequence. D) All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. E) The RR Lyrae stars have much shorter periods than Cepheids.
The change in size of an object due to thermal expansion depends upon
a. what the object is made of. b. the object's original size. c. how much the temperature changes. d. A and C. e. all of the above.