A wheel of moment of inertia 2 kg·m² rotates at 60 rpm. What constant braking torque brings it to rest in 1 minute?
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Question

A wheel of moment of inertia 2 kg·m² rotates at 60 rpm. What constant braking torque brings it to rest in 1 minute?

G1 Physics · Accepted Answer

Step 1: Initial ω=60×2π/60=2π rad/s; α magnitude=2π/60=π/30 rad/s². Step 2: Then τ=Iα=2×π/30=π/15 N·m. Final answer: C — π/15 N·m.