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Q.

A wheel of mass 5 kg and radius 0.40 m is rolling on a road without sliding with angular velocity of 10 rad s-1. The moment of inertia of the wheel about the axis of rotation is 0.65 kg m2. The percentage of kinetic energy of rotation in the total kinetic energy of the wheel is

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a

22.4 %

b

11.2 %

c

88.8 %

d

44.8%

answer is D.

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Detailed Solution

Here, m = 5 kg, I = 0.65 kg m2          ω = 10 rad s-1,  R = 0.40 mLinear velocity        v = Rω = 0.40× 10 = 4 ms-1Translatiional KE          = 12mv2 = 12×5×16 = 40 JRotational KE        = 12Iω2 = 12×0.65×100 = 32.5 JTotal KE = Translational KE + Rotational KE         = 40+32.5 = 72.5 JPercentage of rotational KE = Rotational KETotal KE  ×100                                             = 32.572.5×100 = 44.8%
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