Which of these is NOT now on the surface of Mars?
A) Mars Global Surveyor
B) Viking 1
C) Pathfinder
D) Sojourner
E) Spirit
A
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For a given element, which of the following has the greatest entropy?
(a) A perfect single crystal (b) A polycrystal (c) A liquid (d) A vapor
A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N
If the 600-N force is removed, the resultant force acting on the crate is A) zero. B) 200 N to the right. C) 200 N to the left. D) 400 N to the left. E) impossible to determine from the information given.
In a binary system, the more massive star
a. is at the center of mass. b. is farthest from the center of mass. c. is nearest the center of mass. d. follows the largest orbit. e. shows a larger Doppler shift in its spectral lines.
The conterminous United States lies predominantly in which wind zone?
a. Westerlies b. Northeast tradewinds c. Polar easterlies d. Doldrums