After a switch is thrown to remove the battery from a DC LR circuit, but the circuit is still left complete, the time constant represents
a. the time rate of change of the current in the circuit.
b. the time rate of change of the induced emf in the circuit.
c. the magnitude of the ratio of the current to the time rate of change of the current.
d. all of the above.
e. only (a) and (b) above.
c
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A series LR circuit consists of a 2.0-H inductor with negligible internal resistance, a 100-ohm resistor, a switch, and a 9.0-V power source. After the switch is closed, what is the maximum power delivered by the power supply?
A) 0.40 W B) 81 W C) 0.090 W D) 8.1 W E) 0.81 W
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.
Rover eats 0.50 pound of dry dog food per day. How many 5.0-kilogram sacks of dog food does his owner need to buy in a year?
A) 17 B) 25 C) 52 D) 80 E) 81
The wavelength of a wave multiplied by the frequency of the wave is the wave's
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