A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J.
B. 51.9 J.
C. 62.8 J.
D. 49.9 J.
E. 58.4 J.
C. 62.8 J.
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Approximately what percentage of mass-energy of infalling matter can be converted to thermal energy when the matter is falling into a supermassive black hole?
A) about the same as that converted by hydrogen fusion B) much less than that converted by hydrogen fusion C) much more that converted by hydrogen fusion
How many neutrons are in a 
nucleus?
A. 79 B. 179 C. 118 D. Some other number (specify)
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Answer the following statement true (T) or false (F)
The diameter of no. 12 copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20. A
At this current, what is the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is 8.5 × 1022.)