Rotational Kinetic Energy: While spinning down from 500 rpm to rest, a flywheel does 3.9 kJ of work. This flywheel is in the shape of a solid uniform disk of radius 1.2 m. What is the mass of this flywheel?
A. 4.0 kg
B. 3.4 kg
C. 4.6 kg
D. 5.2 kg
Answer: A
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A capacitor is designed so that one plate is large and the other is small. If the plates are connected to a battery,
1.the large plate has a greater charge than the small plate. 2.the large plate has less charge than the small plate. 3.the plates have equal, but opposite, charge.
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
A low-power source of energy could put out a lot of work provided it
A) exerted its power over a very large distance. B) operated for a short time. C) operated for a long time. D) exerted a sufficiently strong force. E) Nonsense-- there is no way that a low-power source can put out a large amount of work.
You can increase the temperature of a gas by compressing it
Indicate whether the statement is true or false