The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
a. lighter molecules.
b. heavier molecules.
c. lower speeds.
d. higher speeds.
e. more probable speeds.
d
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A flashlight, which uses two 1.5 V batteries in series, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated?
A. 12 J B. 9.0 J C. 72 J D. 36 J E. 18 J
The United States consumes 2.5 × 10^19 J of energy each year. A typical solar flare releases 5.0 × 10^24 J of energy. How many years could we run the United States on the energy released by this solar flare if all of the released energy could be used?
a. 5 × 10^-6 years b. 200,000 years c. 1.25 × 10^44 years d. about 12 years e. 500 years
You ride on an elevator that is moving upward with constant speed while standing on a bathroom scale. The reading on the scale is
A) equal to your true weight, mg. B) more than your true weight, mg. C) less than your true weight, mg. D) zero. E) could be more or less than your true weight, mg, depending on the value of the speed.
Suppose a mass is attached to the end of a horizontal oscillating spring of spring constant. Choose the answer that will double the frequency of oscillation.
A. Quadruple the mass, or quadruple the spring constant. B. Divide the mass by four, or quadruple the spring constant C. Divide the mass by two, or double the spring constant D. Divide the mass by 2, or multiply the spring constant by 2