Explanation Given information: The angular velocity ( ω ) of electric motor is 3,600 rpm. The time ( t ) is required for the unit coasts to rest is 70 s. The combined weight of grinding wheel and rotor is 6 lb. The combined radius of gyration ( k ) about its mass center is 2 inch. Calculation: Find the combined mass ( m ) of grinding wheel and rotor using the equation: m = W g Substitute 6 lb for W and 32.2 ft/s 2 for g . m = 6 32.2 = 0.18634 lb ⋅ s 2 /ft Find the mass moment of inertia ( I ) using the equation: I = m k 2 Substitute 0.18634 lb ⋅ s 2 /ft for m and 2 in. for k . I = 0.18634 × ( 2 in . × 1 ft 12 in . ) 2 = 0.00518 lb ⋅ ft ⋅ s 2 Consider principle of impulse and momentum. Syst Momenta 1 + Syst Ext Imp 1 → 2 = Syst Momenta 2 Sketch the impulse and moment diagram as shown in Figure (1)

11th Edition

ISBN: 9781259633133

Author: BEER

Publisher: MCG

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Chapter 17.2, Problem 17.54P

To determine

The average magnitude of the couple due to kinetic friction in the bearings of the motor.

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Chapter 17.2, Problem 17.53P

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Chapter 17 Solutions

VECTOR MECH...,STAT.+DYNA.(LL)-W/ACCESS

Ch. 17.1 - A round object of mass m and radius r is released...Ch. 17.1 - Prob. 17.2CQ Ch. 17.1 - Prob. 17.3CQ Ch. 17.1 - Prob. 17.4CQ Ch. 17.1 - Slender bar A is rigidly connected to a massless...Ch. 17.1 - A 200-kg flywheel is at rest when a constant 300...Ch. 17.1 - The rotor of an electric motor has an angular...Ch. 17.1 - Prob. 17.3P Ch. 17.1 - Two disks of the same material are attached to a...Ch. 17.1 - Prob. 17.5P

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