A bicycle wheel has an initial angular speed of 7.2 rad/s. After turning through of a revolution, the angular speed is reduced to 2.2 rad/s
If the angular acceleration of the wheel was constant during the motion, how long will it take the wheel to make the revolution?
0.67 s
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Our solar system lies about how many light-years from the center of the nuclear bulge of the Milky Way?
a. 2400 b. 28,000 c. 110 d. 4.3
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum velocity in the upward direction?
A. 20.0 m/s B. 25.0 m/s C. 30.0 m/s D. 35.0 m/s E. 40.0 m/s
The sunspot cycle has a period of
a. 19 years. b. 11 years. c. 38 years. d. 24 years.
All the following statements about Mars are true. Which one might be the cause of a significant loss of atmospheric gas to space?
A) The rock on Mars is probably red because of chemical reactions with oxygen that had been released into the atmosphere through the outgassing of water molecules. B) Mars lost its global magnetic field, leaving the atmosphere vulnerable to the solar wind. C) The axis tilt of Mars is thought to change significantly with time. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.