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Question

an equilateral triangle is formed by three exactly same uniform rods each of length 0.25m and mass 5kg . Find the moment of inertia about an axis passing through one corner ​

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Solution

Dear student
Moment of inertia is Moment of inertia of the rods which are touching the the axis are each equal to the moment of inertia about the axis passing through the end of the rod I=ml33moment of inertia of the third rod from the parallel axis theorem I=Icm+mr2 I=Icm+mr2r: perpendicular distance of the opposite side of the rod from the axis or from the corner .From geometry of triangle r=3l2I=ml312+m(3l2)2I=ml33+ml33+ml212+m(3l2)2I=2ml33+ml212+m(3l2)2I=2ml33+ml212+3ml24I=2ml33+ml212+3ml24 =32ml2I=32×5×0.252I=32×5×0.252=0.468 kgm2Regards

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