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Engineering and Tech / Engineering Mechanics: Statics & Dynamics 14 / Chapter 8 / Problem 8-104

Engineering Mechanics: Statics & Dynamics | 14th Edition | ISBN: 9780133951929 | Authors: Russell C. Hibbeler

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The 20-kg motor has a center of gravity at G and is pin

Chapter 8, Problem 8-104

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QUESTION:

The 20-kg motor has a center of gravity at G and is pin connected at C to maintain a tension in the drive belt. Determine the smallest counterclockwise twist or torque M that must be supplied by the motor to turn the disk B if wheel A locks and causes the belt to slip over the disk. No slipping occurs at A. The coefficient of static friction between the belt and the disk is ms = 0.3. 50 mm M

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QUESTION:

The 20-kg motor has a center of gravity at G and is pin connected at C to maintain a tension in the drive belt. Determine the smallest counterclockwise twist or torque M that must be supplied by the motor to turn the disk B if wheel A locks and causes the belt to slip over the disk. No slipping occurs at A. The coefficient of static friction between the belt and the disk is ms = 0.3. 50 mm M

ANSWER:

Step 1 of 4

The mass of the motor,

The coefficient of the friction,

The free body diagram of the motor:

Diagram, engineering drawing

Description automatically generated

Where and are the frictional forces.

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