In the case of light waves, the thing doing the "waving" is
A) charged particles throughout the region between source and receiver.
B) a gravitational field.
C) the ether.
D) an electromagnetic field.
E) the air.
D
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A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
The basic energy resource that fueled the "industrial revolution" was a form of
A) nuclear energy. B) thermal energy. C) gravitational energy. D) chemical energy. E) radiant energy.
Consider the following quantities: (1) current, (2) resistance, (3) coil area, (4) wire cross-sectional area, and (5) magnetic field. Upon which of the quantities is the magnetic dipole moment of a current carrying coil dependent?
a) 1 and 5 only b) 1 and 2 only c) 2 and 3 only d) 1, 3, 4, and 5 e) 1 and 3 only
A contact lens is made of plastic with an index of refraction of 1.50 . The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?