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Engineering and Tech / Engineering Mechanics: Statics 14 / Chapter 8 / Problem 8-11

Engineering Mechanics: Statics | 14th Edition | ISBN: 9780133918922 | Authors: Russell C. Hibbeler

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Answer: Determine the maximum weight W the man can lift

Chapter 8, Problem 8-11

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QUESTION:

Determine the maximum weight W the man can lift with constant velocity using the pulley system, without and then with the “leading block” or pulley at A. The man has a weight of 200 lb and the coefficient of static friction between his feet and the ground is \(\mu_{\mathrm{s}}=0.6\).

Questions & Answers

QUESTION:

Determine the maximum weight W the man can lift with constant velocity using the pulley system, without and then with the “leading block” or pulley at A. The man has a weight of 200 lb and the coefficient of static friction between his feet and the ground is \(\mu_{\mathrm{s}}=0.6\).

ANSWER:

Problem 8-11

Determine the maximum weight W the man can lift with constant velocity using the pulley system, without and then with the leading block or pulley at A. The man has a weight of 200 lb and the coefficient of static friction between his feet and the ground is .

Step by Step Solution

Step 1 of 8

(a) For the person not to slip, maximum value of the static friction force must be equal or greater than the force which is trying to initiate motion

By equating sum of forces in the x-direction to zero, we will determine friction force F

Since friction force is just enough to prevent motion, we can say that maximum value of the static friction force must be maximum

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