Comparing Mercury to the Earth's Moon:
A. Mercury is more than 100 times the mass of Earth's Moon.
B. Mercury is only about 1/100th the mass of Earth's Moon
C. they both take the same time to complete one orbit around the Sun.
D. they both have little atmosphere and a similarly cratered surface.
E. Since Mercury has so many active volcanoes, the craters on its surface have almost all been wiped away, while the Moon's craters remain.
Answer: D. they both have little atmosphere and a similarly cratered surface.
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Velocity: If you run a complete loop around an outdoor track of length 400 m in 100 s, find your(a) average velocity and (b) average speed.
Fill in the blank(s) with the appropriate word(s).
According to the supermassive black hole hypothesis, how is the energy that powers active galactic nuclei produced?
A) by nuclear fusion near the central black hole B) by magnetic fields that trap and accelerate charged particles C) by the impact of jets being shot out of the central black hole D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy E) by matter—antimatter annihilation
Some type of solar eclipse will happen about:
A) every month at new moon. B) every week at full moon. C) every month at full moon. D) about every six months at new moon. E) every year at new moon.
In strength, the magnetic fields of Uranus and Neptune are
A) very different, with flopped over Uranus having no field, and Neptune a strong one. B) similar, with both about 100 times stronger than our own. C) even stronger than that of Jupiter. D) perfect fits for the Dynamo theory. E) like Jupiter and Saturn, due to mantles of liquid metallic hydrogen.