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Q.

A cord of negligible mass is wound round the rim of a fly wheel of mass 20 kg and radius 20 cm. A steady tangential pull of 25 N is applied on the chord. If the wheel is free to rotate about a normal axis through its centre, the angular acceleration of the wheel is

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a

6 rads−2

b

12.5 rads−2

c

30 rads−2

d

15 rads−2

answer is C.

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Detailed Solution

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F⋅R=Iα where I=mr22

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