Which statement about the rotations of the Moon and Mercury is FALSE?
A) Our Moon is in a 1:1 synch with the Earth, keeping the same side toward us.
B) Mercury is in the 3:2 synch with the Sun, with the same side Sunward at perihelion.
C) Like our Moon, Mercury does not rotate at all, keeping the same side facing the Sun.
D) On Mercury, three days exactly equal two years.
E) On the Moon, each "day" lasts about 15 Earth days of constant sunlight.
C
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A buried power cable as described in Example Problem 3-15, is 0.46 inches in diameter and is 3 feet below grade. The cable will be expected to transmit 1200 amperes at 440 volts. Estimate the equilibrium temperature.
What will be an ideal response?
Part of astrophysics is understanding the history of celestial objects
a. True b. False Indicate whether the statement is true or false
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together. B) Fusion can proceed only by the proton-proton chain, and therefore requires that protons come close enough together to be linked up into a chain. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together.
A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance
After the rod is separated, the rod A) is repelled by the sphere. B) is attracted to the sphere. C) feels no force due to the sphere.