Find out the increase in moment of inertia I of a uniform rod (coefficient of linear expansion α ) about its perpendicular bisector when its temperature is slightly increased by ?T.
Find out the increase in moment of inertia I of a uniform rod (coefficient of linear expansion α ) about its perpendicular bisector when its temperature is slightly increased by ?T.
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1 Answer
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This is a short answer type question as classified in NCERT Exemplar
Let the mass and length of a uniform rod be M and l respectively.
Moment of inertia of the rod about its perpendicular bisector I= ml2/12

Increase in length of the rod when temperature is increased by T is given by
So new moment of inertia of the rod = =
As change in length is very small therefore neglecting so we get
I’= = l+mI
Increase in moment of inertia =
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