The force a spring exerts on a body is a conservative force because
a. a spring always exerts a force opposite to the displacement of the body.
b. a spring always exerts a force parallel to the displacement of the body.
c. the work a spring does on a body is equal for compressions and extensions of equal magnitude.
d. the work a spring does on a body is equal and opposite for compressions and extensions of equal magnitude.
e. the net work a spring does on a body is zero when the body returns to its initial position.
e
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In the fission reaction 
what are the Z and A for the unknown fission product?
A. 37, 90 B. 35, 94 C. 36, 90 D. 37, 91 E. 36, 91
The relative size of the atmosphere layer as compared to the solid part of Earth is most similar to:
A) the peel of an orange as compared to the meat of the orange. B) the rind of a watermelon as compared to the meat of the watermelon. C) the skin of a grape as compared to the meat of the grape. D) the meat of a peach as compared to the pit of the peach. E) the meat of a cherry as compared to the pit of the cherry.
In order to jump off the floor, the floor must exert a force on you
a. in the direction of and equal to your weight. b. opposite to and equal to your weight. c. in the direction of and less than your weight. d. opposite to and less than your weight. e. opposite to and greater than your weight.
Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. The Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.