Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere arrives first.
B) Both reach the bottom at the same time.
C) The large sphere arrives first.
B
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Walther Bothe and Wilhelm Becker discovered a new kind of particle radiation in 1930. The particle was later determined to be a neutron. Bothe and Becker generated neutron radiation by
A. firing a beam of alpha particles at a beryllium target. B. heating nuclei to extremely high temperatures to boil the neutrons off. C. using an isotope that decays by emitting neutrons. D. using electrons to attract protons away from the nucleus.
The constellations of the zodiac fall along:
A) the ecliptic. B) the celestial equator. C) lines of longitude. D) lines of latitude.
Evidence of liquid water in Mars' distant past suggests that it had a substantial atmosphere compared to what it has presently. What happened to its water vapor?
A) The carbon dioxide in its atmosphere dissolved in the water and combined with surface rocks. B) Its atmosphere was mostly hydrogen and helium. Mars' gravity is too weak to hold them. C) The water vapor has frozen out into the polar ice caps and permafrost as Mars has cooled. D) Mars initially had such a large greenhouse effect that the atmosphere became quite hot and slowly escaped. E) It has now all been lost in space, including the carbon dioxide and water vapor.
According to the philosophy of Democritus,
A) the color red is not "real" but is instead just humans' "conjecture" or imagination. B) atoms are not "real" but are instead just humans' "conjecture" or imagination. C) Both of the above. D) Neither of the above. E) the moon is really a giant frog.