An AC voltage source, with a peak output of 72 V, results in dissipation of energy in a resistor at rate of 140 W. What is the value of the resistance?
a. 37 ?
b. 26 ?
c. 9 ?
d. 19 ?
e. 52 ?
d
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Star formation ceased first in the
A) nucleus. B) spiral arms. C) bulge. D) halo. E) Galactic disk.
A superconducting solenoid is to be designed to generate a magnetic field of 2.50 T. If the solenoid winding has 1000 turns/m, what is the required current? (µ0 = 4p × 10^-7 T×m/A)
a. 5000 A c. 3980 A b. 1990 A d. 1000 A
An innovative physics professor conducts laboratory exercises in the college swimming pool. Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off a surface of a crystal. A laser bounced off the crystal surface is found to be perfectly polarized when the angle of incidence of the laser beam is 57 degrees from the vertical. What is the index of refraction of the crystal? It will help to recall that the index of refraction of water is 1.33.
A. 1.17 B. 1.12 C. 1.54 D. 2.05
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT b. 12 mT c. 15 mT d. 22 mT e. 10 mT