Uniform Circular Motion: One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis. Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide "normal" gravity for the astronauts?
A. 28 s
B. 39 s
C. 6.2 s
D. 4.4 s
Answer: A
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Differential rotation of the sun is
a. heating in the chromosphere and corona that makes them hotter than the photosphere. b. the magnetic dynamo inside the sun. c. the equatorial regions of the sun rotating more rapidly than the polar regions. d. the origin (and subsequent disappearance of) sunspots first near the poles then closer to the sun's equator as the sunspot cycle progresses. e. the rotation of the sun's southern and northern hemispheres in opposite directions.
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
Which best describes a system made up of ice, water and steam existing together?
a. absolute zero b. triple point c. ice point d. steam point
A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = ?30 cm. What is the acceleration of the particle?
a. ?7.3 cm/s2 b. ?8.9 cm/s2 c. ?11 cm/s2 d. ?15 cm/s2 e. ?13 cm/s2