A disc has a mass of 10 kg distribute uniformly and has a radius of 2 m. Moment of inertia about an axis passing through its centre and perpendicular to its plane is.
A
20 kgm2
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B
10 kgm2
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C
40 kgm2
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D
40 kgm2
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Solution
The correct option is A 20 kgm2 M.I. of disc = mR22 Given, m = 10 kg r = 2 m M.I. of disc = 10×222 = 20 kgm2