A hockey puck sliding at constant velocity across the ice is
A) in equilibrium.
B) nearly in equilibrium.
C) is nowhere near being in equilibrium.
D) none of the above
Answer: A
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Earth is trying to fall into the sun but it keeps on missing it. why?
What will be an ideal response?
During which type of lunar eclipse does the Moon remain longest in the Earth’s shadow?
A. penumbral B. partial C. total D. For all three types of eclipse, the Moon remains in the Earth’s shadow the same length of time. E. none of the above is accurate
Which of the following statements about the celestial sphere is not true?
A) The Earth is placed at the center of the celestial sphere. B) When we look in the sky, the stars all appear to be located on the celestial sphere. C) The "celestial sphere" is another name for our universe. D) The celestial sphere does not exist physically.
Why does the Cepheid distance method fail us beyond about 20 Mpc?
A) The intergalactic dust reddens the Cepheid's light and apparent brightness. B) Distant galaxies are younger than our Milky Way; too young to have Cepheids yet. C) The periods of Cepheids grows longer as the distances increase. D) Distant galaxies are seen in the past, and Cepheids evolve with time. E) Even with the HST, the most luminous Cepheids are too faint to be seen beyond 20 Mpc.