A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric field strength at various points outside the sphere surface. If the probe is initially at a distance 3R from the sphere's center and then is moved to 5R, by what factor will the electric field reading change?
a. 3/5
c. 5/3
b. (5/3)2
d. (3/5)2
D
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Intensity: The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?
A. d/2
B. d/
C. d/4
D. d/8
Uniform Circular Motion: An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors.
A. Both vectors point in the same direction. B. The vectors point in opposite directions. C. The vectors are perpendicular to each other. D. The acceleration is zero but the velocity is constant.
The atmosphere of Venus consists mainly of ________.
A. sulfuric acid B. nitrogen and oxygen C. carbon monoxide D. hydrogen and helium E. carbon dioxide
The basic function of an electromotive force in a circuit is to do which of the following?
a. Convert electrical energy into some other form of energy. b. Convert some other form of energy into electrical energy. c. Both choices (a) and (b) are valid. d. None of the above choices are valid.