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Q.

A wheel of moment of inertia 2.0×103 kgm2 is rotating at uniform angular speed of 4 rads-1. What is the torque required to stop it in one second.

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a

0.5 × 103 Nm

b

8.0 × 103 Nm

c

2.0 ×103 Nm

d

None of these

answer is B.

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Detailed Solution

α = ∆ωt = 0-41 =- 4 rad/s2τ = Iα = 2×103 ×(-4) = -8 ×103N-sign indicates retarding torque
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