A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is kept stationary with respect to the coil
As viewed from above, you can say that the magnet induces A) counterclockwise current in the loop.
B) clockwise current in the loop.
C) no current in the loop.
D) an emf but no electric current in the loop.
E) Not enough information is provided.
C
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The redshift of galaxies in the Universe is correctly interpreted as:
A: A Doppler shift due to the motions of galaxies through space. B: An "aging" of the light. C: Space itself expanding with time; the photon wavelengths are stretched as they they travel through space. D: The difference in temperature of distant and nearby galaxies. E: Extinction due to the effects of dust in galaxies.
Weather occurs in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
Thermodynamic Devices: During each cycle, the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?
A. 110 J B. 150 J C. 330 J D. 480 J E. 630 J
Which of the following is NOT a compound?
A) air B) ammonia C) water D) salt E) all are compounds