Find moment of inertia of uniform half disc about an axis perpendicular to plane and passing through its centre of mass. Mass of this risk is M and radius R.
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mass of complete disc = M + M = 2M
the MOI of complete disc about the given axis is = 2MR2/2 = MR2
thus MOI of Half disc = MR2/2
the MOI of complete disc about the given axis is = 2MR2/2 = MR2
thus MOI of Half disc = MR2/2
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