A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The peak current in the circuit is
a. 8.24 A.
b. 8.84 A.
c. 11.0 A.
d. 12.4 A.
e. 23.5 A.
a
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If the distance a spring is stretched from its equilibrium position is halved the potential energy of the spring is multiplied by
A. 4 B. 2 C. 0.5 D. 0.25
Masses of the planets are easiest to determine if
A) they are terrestrial and the extra size of the planet's disk can be measured. B) they are jovian and their oblateness can be found. C) they have natural satellites whose motions can be precisely measured. D) they are dense and easily deflect the path of passing spacecraft. E) they move rapidly and their periods are easily measured.
In ?- decay, the number of protons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.
A spherical air bubble originating from a scuba diver at a depth of 30.0 m has a diameter of 1.0 cm. What will the bubble's diameter be when it reaches the surface? (Assume constant temperature.)
a. 0.7 cm c. 1.4 cm b. 1.0 cm d. 1.6 cm