A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 980 N. The mass of the parachutist is
A. 980 kg.
B. 220 lb.
C. 100 kg.
D. 100 lb.
E. 980 lb.
Answer: C
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Force on a Wire: The direction of the force on a current-carrying wire in a magnetic field is
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A. is believed to be constant with time. B. is believed to have the same value throughout space. C. leads to a determination of the mass of Earth. D. All of the above are true.
The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6000 K to 6100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
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