A physics professor pushes against a stationary wall, "working" up a sweat. Is he doing any actual physical work on the wall?
A) No--it's a law of nature that physics profs never do any actual work.
B) No, because the force by his hands against the wall is balanced by the force by the wall pushing back.
C) Yes, because he is exerting a force against the wall during a period of time.
D) No, because the wall is not moving.
E) Yes, because his arm muscles are moving other muscles through a distance.
D
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The central region of an atom is called the ________.
Fill in the blank(s) with the appropriate word(s).
The specific heat capacity of water is about twice the specific heat capacity of ice. From this information, the amount of heat required to boil 1 kg of water is ________ the amount of heat required to melt 1 kg of ice
a. 1/2 c. 2 times b. equal to d. unrelated to
If 
what is the power supplied to the circuit by 
?
A. 4.0 W
B. 8.0 W
C. 12 W
D. 16 W
E. 20 W
____________________ are great lava flows covering 17% of the lunar surface
Fill in the blank(s) with correct word