Q.

The moment of inertia of a body about an axis is 1.2 kg-m2. Initially the body is at rest. In order to produce a rotational kinetic energy of 1500 J, an angular acceleration of 25 rad/s2 must be applied about the axis for a duration of (in seconds)

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answer is 2.

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Detailed Solution

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E=122

ω=2EI=2×15001.2=50rad/s

Time taken to attain this value of ω is t=ω-0α=5025=2 s 

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