A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. How large is the coefficient of kinetic friction, ?k, if the plane makes an angle of 25.° with the horizontal?
A) 0.47
B) 0.91
C) 1.2
D) 0.42
E) 0.37
A
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The planet with Red Spot Junior is
a. Jupiter. b. Neptune. c. Uranus. d. Saturn. e. Mars.
_____ was a type II supernova that was produced by the explosion of a hot, blue supergiant
A) SN 1572 B) SN 1604 C) SN 1987A D) SNR 1868
Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in the other wire is 30 A. The currents are in the same direction. If the 30-A current is increased to 50 A, by what factor does the magnitude of the magnetic field midway between the wires change?
a. 2 c. 25/9 b. 4 d. 5/3
Infrared waves are often called heat waves because they
40) A) emanate from relatively hot sources. B) consist of frequencies lower than those of visible light. C) induce resonance in molecules and increase internal energy in a substance. D) are the predominant waves emitted by the sun.