Which of the following statements was true beyond the frost line (but not interior to it)?
a. It was so warm that only metal and rock could condense from the gas.
b. This was the only region that flattened into a disk.
c. No object as small as a terrestrial planet could form.
d. It was cold enough for hydrogen compounds to condense into ices
Answer: d. It was cold enough for hydrogen compounds to condense into ices.
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When Burl and Paul stand on opposite ends of a sign-painting scaffold, the tensions in the supporting ropes
A) are equal. B) depend on the relative weights of Burl and Paul. C) combine to equal zero. D) are in equilibrium.
Which of these is true about the seasons of Uranus?
A) With a tilt of 29 degrees, they are not that different from our solstices and equinoxes. B) Its strange tilt produces extreme seasonal variations, especially at the poles. C) At the Uranian equator, the Sun would pass overhead every sixteen hours. D) At the Uranian pole the Sun sets every 16 hours during the summer and winter. E) There are no seasons at the poles.
The type of nuclear reactor used in the United States was originally developed
A) during the Manhattan project. B) in Canada. C) as part of the H-bomb program. D) by private industry. E) for submarines.
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 3 A and increasing. The current in the secondary must be
a. 3 A. b. 6 A. c. zero. d. There is insufficient information to work this problem.