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A disc of moment of inertia 2 kg m^(2) i...

A disc of moment of inertia `2 kg m^(2)` is acted upon by a constant torque of 40 Nm. If it is initially at rest, then the time taken by it to acquire an angular velocity 100 rad/s will be

A

20 s

B

10 s

C

5 s

D

4 s

Text Solution

Verified by Experts

The correct Answer is:
C
`omega = alpha t & tau = I alpha `
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NARAYNA-SYSTEM OF PARTICLES AND ROTATIONAL MOTION -EXERCISE - I(H.W)
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  2. A uniform rod of mass m is bent into the form of a semicircle of radiu...

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  19. If a sphere of mass 2kg and diameter 10cm is rolling at speed of 5ms^(...

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  20. A solid sphere and a solid cylinder having the same mass and radius, r...

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