The phase angle of a series RL ac circuit with a 20.0-mH inductor and a certain resistor at 1000 Hz is 20.0°. What is the resistance in this circuit?

A) 145 ? B) 200 ? C) 100 ? D) 245 ? E) 345 ?


E

Physics & Space Science

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The column of Trajan, erected in Rome in 106-113 A.D., is 125 feet tall. What is its height in centimeters?

A) 1,510 cm B) 591 cm C) 2,520 cm D) 3,810 cm E) 38,100 cm

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An incredibly dense star so massive that light cannot escape from its surface is called a _______________

a. red giant b. black hole c. white dwarf d. pulsar

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The main point of Newton's law of motion is that forces cause

A) velocity. B) energy. C) acceleration. D) All of the above. E) None of the above.

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Consider the equipotential surfaces shown in Figure 25.4. In this region of space, what is the approximate direction of the electric field?

Physics & Space Science