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Unformatted text preview: moment of inertia. The braking force can be found from the torque. SOLVE ( a ) 1. Set the work done equal to the change in kinetic energy: Answer: 2. Using ( Equation 9-24 ), relate the work to the torque and the angular displacement: Answer: 3. Using ds = r d θ ( Equation 9-2 ), relate the angular displacement to the stopping distance s : Answer: 4. The mass is concentrated near the rim of the wheel, so I ≈ mr 2 : Answer: 5. Substitute into the step-1 result and solve for the torque. The initial angular velocity is 2.0 rev/h = 3.49 × 10−3 rad/s: Answer: ( b ) 1. The line of action of the braking force is tangent to the rim, so the moment arm is equal to the radius of the wheel. Answer:...
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This note was uploaded on 11/29/2010 for the course PHYS 1301W taught by Professor Marshak during the Spring '08 term at Minnesota.
- Spring '08