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Home Q & A Board Science-Related Homework Help Physics
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mikael mikael
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10 years ago

 
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 107 J of energy. Suppose one tried to store this much energy in a spinning solid cylindrical flywheel which was then coupled to the wheels of the car. A large flywheel cannot be spun too fast or it will fracture. If one used a flywheel of radius 0.60 m and mass 400 kg, what angular speed would be required to store 3.2 × 107 J? (Incidentally, 2500 rpm is about the maximum feasible rate of revolution with present materials technology for such a flywheel.) 
A)
 
1800 rad/s 
B)
 
3620 rad/s 
C)
 
943 rad/s 
D)
 
530 rad/s 
E)
 
5470 rad/s 
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padrepadre
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10 years ago
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