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Q.

The diameter of a disc is 1m. It has a mass of 20kg. It is rotating about its axis with a speed of 120 rotations in one minute. Its angular momentum in kg m2/s is

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a

13.4

b

31.4

c

41.4

d

43.4

answer is B.

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L=Iω; where I=mr22;ω=2πn
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