The kilowatt is a measure of
A) force. B) sex appeal. C) energy. D) power. E) speed.
D
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All weather and wind on Earth are a result of convection in the
a. troposphere. b. stratosphere. c. mesosphere. d. ionosphere. e. thermosphere.
If the current density in a wire is given by j = kr, 0 < r < R, where R is the radius of the wire, the current in the wire is
A) 2?kR3/3. B) 3?kR3/2. C) kR3/3. D) kR2. E) kR2/2.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time. B. the same distance up as before, but take a longer time. C. a smaller distance up, but take a shorter time. D. a greater distance up, but take a longer time. E. a greater distance up, but take the same time.
All the stars in this photo are at about the same distance from Earth (some 25,000 light-years away). Which stars in this picture are the largest in size (radius)?
A) the bright red stars B) the blue/white stars that look largest on the photo C) the stars that have the spikes D) the dim red stars