There is a greatest movement of plasma in the
A) convection zone.
B) radiation zone.
C) core.
D) All of the above.
Answer: A
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How much heat needs to be removed from 100 g of 85°C water to make -5°C ice?
A) 255 cal B) 168 kcal C) 8.5 kcal D) 16.5 kcal E) 16.8 kcal
General Questions: A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A. 75 N. B. 7.5 N. C. 750 N. D. any horizontal force greater than zero.
The reason that a surface appears darker when wet has to do with
A) the darkness of liquids. B) conversion of light to lower frequencies. C) absorption of multiply-reflecting light inside the wet region.
Pioneer 10 was able to escape the solar system by
A) having a sufficient escape velocity at launch. B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket. C) refueling via solar cells. D) nuclear-powered sustained thrust.