One kilowatt-hour is a unit of
A) energy.
B) power.
C) voltage.
D) current.
E) resistance.
Answer: A
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Which of the following particles is NOT made up of quarks? (There may be more than one correct choice.)
A) ?-meson B) electron C) proton D) neutrino E) neutron
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.
(d) A spaceship of mass 2m originally at rest burns some matter–antimatter fuel until the ship’s mass is m. The light energy ejected from the ship in this process has total energy m as well.
A. C B. F
Suppose the Sun were suddenly to shrink in size but that its mass remained the same. According to the law of conservation of angular momentum, what would happen?
A) The Sun would rotate faster than it does now. B) The Sun's rate of rotation would slow. C) The Sun's angular size in our sky would stay the same. D) This could never happen, because it is impossible for an object to shrink in size without an outside torque.