Potential Energy: Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A. Their electric potential energy keeps increasing.
B. Their kinetic energy keeps increasing.
C. Their electric potential energy keeps decreasing.
D. Their kinetic energy keeps decreasing.
E. Their acceleration keeps decreasing.
Answer: E
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Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2 B. 21/4 C. 31/4 D. (2 + 1/n)1/4 E. [2 + 1/(n+1)]1/4 F. Some other factor (specify) T. The factor depends on the planet’s initial temperature.
Which of the following factors in the simplified Drake equation is least well known?
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An air-filled capacitor stores a potential energy of 6.00 mJ due to its charge. It is accidentally filled with water in such a way as not to discharge its plates
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Work is defined as force times
a. distance. b. time. c. parallel distance. d. perpendicular distance.