A 120-V rms voltage at 1000 Hz is applied to a series LRC circuit with an equal value of inductive and capacitive reactance and a 200-? resistance. What is the impedance of this circuit?
A)
100 ?
B)
0 ?
C)
240 ?
D)
120 ?
E)
200 ?
E
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Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e
, can you tell that you are moving] without directly or indirectly making use of anything outside of your own reference frame? If so, how could you detect this; and if not, why not? A) Yes. For example, if you dropped a coin you would find that it lands to the rear of the drop point. B) Yes. For example, if you dropped a coin you would find that it lands to the front of the drop point. C) No, because of the principle of relativity. D) No, because of the principle of the constancy of lightspeed. E) No, because jet planes move far too slowly for such an effect to actually be observed.
Heat Engines: A certain heat engine extracts 1.30 kJ of heat from a hot temperature reservoir and discharges 0.70 kJ of heat to a cold temperature reservoir. What is the efficiency of this engine?
A. 46% B. 54% C. 86% D. 27% E. 13%
A light bulb has resistance of 175 ? when operating at 100 V. Find the current in the light bulb
a. 1.8 A b. 0.33 A c. 0.57 A d. 0.76 A e. 1.3 A
When a crate of mass m is dragged a distance d along a surface with coefficient of kinetic friction mk, then dragged back along the same path to its original position, the work done by friction is
a. 0. b. -mkmgd. c. +mkmgd. d. -2mkmgd. e. +2mkmgd.