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.
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
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.
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.