The area under the curve, on a Force-position (F-x) graph, represents
A) work.
B) efficiency.
C) kinetic energy.
D) power.
E) friction.
A
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Why does something weigh less on the Moon than on Earth?
A. The Moon has no atmosphere to apply a downward force on surface objects. B. Earth's gravity pulls in the opposite direction as the Moon's, so the net force is reduced. C. The farther something is from Earth, the lower its weight. D. The Moon's lower mass creates a lower force of gravity at its surface. E. The object's weight is the same on the Moon as it is on Earth.
A radioactive isotope that emits a gamma quantum will change in what respect?
a. Atomic number increases by one. b. Atomic number decreases by one. c. Atomic mass number decreases by one. d. None of the above choices are valid.
At what point in the light curve below is the cooler star in front of the hotter star of an eclipsing binary system?
?
a. 1
b. 2
c. 3
d. 4
e. 5
The greenhouse effect makes Earth warmer than it would be otherwise by about
A) 30 K. B) -16 K. C) 15 K. D) There is no greenhouse effect.