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Q.

A constant torque of 100 N m turns a wheel of moment of inertia 300 kg m2 about an axis passing through its centre. Starting from rest, its angular velocity after 3 s is :-

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a

1 rad/s

b

10 rad/s

c

5 rad/s

d

15 rad/s

answer is A.

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Detailed Solution

We know torque τ can be written as τ=l α

where I is the moment of inertia and 0s the angular acceleration.

So,α=τl=100300=13rad/s2

angular velocity after 3 s

ω=αt

=133=1rad/s

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