From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of _________________.
Fill in the blank(s) with the appropriate word(s).
more than 2 Earth years
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Suppose we had a device that allowed us to see Earth's interior. If we looked at a typical region of the mantle, what would we see happening?
A) not much—on human time scales, the mantle looks like solid rock B) hot molten rock rising upward throughout the mantle and cool, solid rock falling downward C) a rapid, up-and-down churning of the material in the mantle D) dense metals falling downward while low-density rock rises upward
Planetary scientists use crater counts to estimate the
A) habitability of planetary surfaces B) ages of planetary surfaces C) temperatures of planetary surfaces D) chemical compositions of planetary surfaces
A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?
A) 487 m B) 327 m C) 320 m D) 408 m E) 160 m
Compared with the spectral lines in the solar spectrum, lines in a supergiant star's spectrum are
a. more narrow. b. broader. c. weaker. d. stronger. e. broader and weaker.