The Moon
a. revolves about Earth from west to east.
b. has a day equal to 29.5 Earth days.
c. has an elliptical orbit about Earth.
d. all of these.
d
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How fast does a pulsar initially spin?
a. 10 times per second b. 1 time per second c. 100 times per second d. 1000 times per second
According to Kepler's 3rd law, we expect:
A. A more distant planet, e.g. Jupiter, to spin about its axis faster than the Earth B. A more distant planet to spin about its axis slower than the Earth C. An interior planet, e.g. Venus, to spin about its axis faster than the Earth D. none of the above
Cosmological redshift is the result of ________
A) the high speeds at which galaxies move within clusters B) very old, red stars in distant galaxies C) the expansion of the universe D) supermassive black holes
A 475 gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right
If the bat produced an average force of 1275 N on the ball, for how long (in ms) was it in contact with the ball?