A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a 100-? resistor. What is the rms value of the voltage across the inductor?
A) 120 V B) 13.5 V C) 100 V D) 119 V E) 0.700 V
B
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If the drag force on a car is F at a moderate highway speed v, at what speed would the drag force be doubled?
a. 1.2v c. 1.7v b. 1.4v d. 2.0v
A BTU has more energy than a calorie.
Indicate whether the statement is true or false.
Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
An object is released from rest a height h above the ground. A second object with four times the mass of the first is released from the same height. The potential energy of the second object compared to the first is
A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) eight times as much.