A distant palm tree on a hot dry day that often appears to be reflected from water is
A) due to light refracted upward as it grazes the hot surface.
B) the inverse of a mirage.
C) evidence that light travels in straight lines.
Answer: A
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Which of these observations helped test the idea that Mars' atmosphere thinned due to interactions with the solar wind?
A) The MAVEN orbiter measured present-day gas loss from Mars' atmosphere. B) The Curiosity rover measured the carbon content of rocks on Mars' surface. C) Astronomers used spectrographs on the Keck telescope to measure the density of Mars' atmosphere. D) Geologists measured the carbon content of Martian rocks that were transported to Earth by asteroid impacts.
Radioactive muons formed high in the atmosphere have an average lifetime of 2 millionths of a second and travel toward Earth at nearly the speed of light
Because of their altitude most of them should have decayed by the time they reach the Earth's surface, according to pre-relativity physics. They don't because they A) live longer due to time dilation. B) travel a shorter distance due to length contraction. C) both of these D) neither of these
A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed very light spring between them. They are not attached to the spring. After they are released and have both moved free of the spring
A) the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block. B) the heavier block will have more kinetic energy than the lighter block. C) both blocks will both have the same amount of kinetic energy. D) the lighter block will have more kinetic energy than the heavier block. E) both blocks will have equal speeds.
The strong nuclear force is how many times as strong as the gravitation force?
A) 1038 B) 1 (They are the same.) C) 2 D) 100 E) 106