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Q.

A flywheel having a radius of gyration of 2 m and mass 10 kg rotates at an angular speed of 5 rad s-1 about an axis perpendicular to it through its centre. The kinetic energy of rotation is

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a

500 J

b

2000 J

c

1000 J

d

250 J

answer is A.

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Detailed Solution

∴  I=mK2=10(2)2=40 kg-m2Kinetic energy of rotation,KR=12Iω2=12(40)(5)2=500 J
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