A 120-V rms voltage at 1.00 kHz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.04 A C) 1.84 A D) 1.09 A
A
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Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. all of the above e. they are all so far away that the light hasn't reached us yet.
Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is
A) about the same. B) much larger. C) much smaller. D) just slightly less.
From the center outward, the correct order of the zones of Earth is
A. liquid core, solid core, crust, mantle, atmosphere. B. liquid core, solid core, mantle, crust, atmosphere. C. solid core, liquid core, mantle, crust, atmosphere. D. solid core, mantle, liquid core, crust, atmosphere.
You are inside a jet plane moving at a constant velocity. You toss a rock straight up in the air, and then you keep your hand at the point of release. The rock comes down in your hand. This example illustrates
A) that light is a wave. B) the Michelson-Morley experiment. C) the principle of relativity. D) the principle of the constancy of lightspeed. E) that moving clocks go slow.