The tails streaming from a comet's coma are caused by
A. radiation pressure and the particle wind from the Sun pushing them out.
B. explosive forces from the hot nucleus ejecting the gas.
C. the comet leaving the material behind it as it travels forward.
D. the comet's magnetic field channeling and ejecting the particles of the tail.
Answer: A
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Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time. B) These forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about at 10-38 second. C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool. D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
A roller skate at rest may have
A) speed. B) velocity. C) momentum. D) energy.
The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much because
A) your mass is 100 times less on Jupiter. B) Jupiter is significantly farther from the Sun. C) Jupiter's radius is 10 times Earth's radius. D) you are 100 times more weightless there. E) none of the above
The only metal that does not oxidize is _________.
Fill in the blank(s) with the appropriate word(s).