Why do we see essentially the same face of the Moon at all times?
A) because the other face points toward us only at new Moon, when we can't see the Moon
B) because the Moon does not rotate
C) because the Moon's rotational and orbital periods are equal
D) because the Sun illuminates only one half at a time
E) because the Moon has a nearly circular orbit around Earth
C
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Graphical Analysis: The figure shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the displacement of the player(a) during the first two seconds.(b) between t = 4 s and t = 8 s.
Fill in the blank(s) with the appropriate word(s).
Newton showed that Kepler's laws are ________
A) seriously in error B) the key to proving that Earth orbits our Sun C) actually only three of seven distinct laws of planetary motion D) natural consequences of the law of universal gravitation
Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
Compared to the gravitational force on a 1 kg object, the gravitational force on a 2 kg object is
A) the same. B) nine times larger. C) four times larger. D) twice as large. E) None of the above.