A 120-V rms voltage at 60 Hz is applied across a 20-?F capacitor and an unknown resistor. If the rms value of the current in that circuit is 0.60 A, what is the value of the resistor?
A) 60 ?
B) 120 ?
C) 180 ?
D) 150 ?
E) 200 ?
D
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Pulsars slow their pulse rate because:
a. they convert energy of rotation into radiation. b. they drag companion stars around, causing them to slow. c. of friction with the interstellar medium. d. of the conservation of angular momentum.
Observed temperature fluctuations in the Cosmic Microwave Background Radiation are:
A) millions of kelvins. B) hundreds of kelvins. C) a few kelvins. D) tens of millionths of a kelvin. E) immeasurably small.
The force acting on the bottom of the cylinder is nearest:
(A) 55.6 N (B) 50.4 N (C) 45.2 N (D) 38.4 N
Negative work can be done
a. by friction on the tires while a car is accelerating without skidding. b. by a spring at the bottom of an elevator shaft when it stops a falling elevator. c. by a hand catching a ball. d. by all of the above. e. only by (b) and (c) above.