A disc has a mass of 10 kg distribute uniformly and has a radius of 2m. What will be its moment of inertia about an axis passing through its centre and perpendicular to its plane?
A
20 kg−m2
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B
10 kg−m2
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C
40 kg−m2
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D
None of these
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Solution
The correct option is A 20 kg−m2 M.I. of disc = mR22 Given, m = 10 kg r = 2 m ⇒M.I.=10×42=20kg−m2