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4. A wheel with radius 0.45 m and rotational inertia 4.3 kg.m? spins on an axle with an initial angular speed of 5.1 rad/s, Friction

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4. A wheel with radius 0.45 m and rotational inertia 4.3 kg.m? spins on an axle with an initial angular speed of 5.1 rad/s, Friction in the axle exerts a torque on the wheel, causing the wheel to stop after 6.2 s. What is the magnitude of the average torque exerted on the wheel as it slows down

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