The phase angle of a series RL circuit with a 100.0-? resistor and a 20.00-mH inductor is 70.00°. What is the inductive reactance of this circuit?
A) 100.0 ?
B) 150.0 ?
C) 200.0 ?
D) 174.7 ?
E) 274.7 ?
E
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Briefly explain why white-dwarf supernovae are useful for measuring cosmic distances
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Which of the following statements about the rings of the four jovian planets is not true?
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Suppose your friend is sitting on a sled and asks you to move her across a flat, horizontal field. You have a choice of (a) pushing her form behind by applying a force downward on her shoulders at 30° below the horizontal (figure a), or (b) attaching a rope to the front of the sled and pulling with a force at 30° above the horizontal (figure b). Which option would be easier?