How do astronomers think Jupiter generates most of its internal heat?
A) tidal heating
B) internal friction due to its high rotation rate
C) chemical processes
D) nuclear fusion in the core
E) by slowly contracting
E) by slowly contracting
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The cosmic background radiation
a. has a blackbody spectrum. b. has its peak emission in the microwave band. c. corresponds to a blackbody at a temperature of 2.726 kelvins. d. all of the above
What is expression gives the efficiency of an ideal heat engine operating between a higher temperature Th and a lower temperature Tc (both expressed in kelvins)?
a. = 1 + Tc / Th b. = 1 – Tc / Th c. = 1 – Th / Tc d. = 1 – Tc e. = Tc / Th
Which body has the greatest gravitational pull on Earth?
A) the Sun B) the Moon C) Mars D) Jupiter E) None has an impact, as all are too distant.
In color photos, spirals typically have ________ arms with pink H II regions
Fill in the blank(s) with correct word