Find the moment of inertia of an equilateral triangular lamina of mass 1 kg and having sides 3 m about the axis passing through its centre of mass and perpendicular to the plane of triangular lamina.
A
0.75 kg-m2
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B
1.5 kg-m2
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C
1 kg-m2
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D
3 kg-m2
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Solution
The correct option is A0.75 kg-m2
Given: Sides of the equilateral triangular lamina ;a=3 m Mass of triangular lamina ;m=1 kg
M.O.I of equilateral tringular lamina about the axis passing through its centre of mass; Icom=ma26 =1×326 kg-m2 =1.5 kg-m2