68) A body of mass 4 kg is rotating in a vertical circle at the end of a string of - Biology -

Question

68) A body of mass 4 kg is rotating in a vertical circle at the end
of a string of length 0 6 m calculate the difference of K E at the
top and the bottom of the circle

Mridula · Accepted Answer

Dear student,

When a body goes from bottom to top, its height becomes
2r
Kinetic energy at the bottom is consumed in doing work against
gravity = mg(2r)
And the remaining kinetic energy at top becomes

KE (top) = KE (bottom) - 2mgr
Hence,
KE (top) - KE (bottom) = 2mgr

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Regards

68) A body of mass 4 kg is rotating in a vertical circle at the end of a string of length 0.6 m . calculate the difference of K.E at the top and the bottom of the circle.