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