The variables m1 and m2 that appear in the equation F = Gm1m2/r2 are
a. the straight-line distance between the centers of each object.
b. the rate at which each object is moving.
c. the mass of each object.
d. the diameter of each object.
c
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How much heat does it take to increase the temperature of 5 lbs of water by 20°F?
a. 4 b. 25 c. 100 d. 800 Btu.
Reactance: A simple ac circuit consists of an inductor connected across the terminals of an ac power source. If the frequency of the ac source is decreased by a factor of four, what happens to the reactance of the inductor?
A. It decreases by a factor of four. B. It decreases by a factor of eight. C. It increases by a factor of two. D. It increases by a factor of four. E. It increases by a factor of eight.
A sample of matter that contains atoms that all have the same number of protons is
a. an element. b. a substance. c. a compound. d. a homogeneous mixture.
An asteroid moving around the Sun happens to experience only negligible forces from other objects in the solar system. The path of this asteroid will be
A. a sinusoid. B. an ellipse. C. a straight line. D. a parabola.