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 197 lb and the coefficient of static friction between his feet and the ground is μ = 0.59. (a) Part A Consider the lifting without the pulley at A. Draw the free-body diagram of the man. The man has a center of gravity at G. Part B < 8 of 10 Determine the maximum weight W the man can lift with constant velocity using the pulley system, without the pulley at A. Express your answer to three significant figures and include the appropriate units. (b) >

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 197 lb and the coefficient of static friction between his feet and the ground is μ = 0.59. (a) Part A Consider the lifting without the pulley at A. Draw the free-body diagram of the man. The man has a center of gravity at G. Part B < 8 of 10 Determine the maximum weight W the man can lift with constant velocity using the pulley system, without the pulley at A. Express your answer to three significant figures and include the appropriate units. (b) >

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.4P: The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical...

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The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the coefficient of static friction is 0.5 at all three contact surfaces, determine whether the sheets will remain at rest.
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The coefficient of static friction between the block and the plane is μs=0.2, and between the rope and the drum D is μ′s=0.3. (Figure 1) Determine the maximum value of weight W which may be applied without causing the 75-lb block to slip. Determine the minimum value of weight W which may be applied without causing the block to slip.
A block with a mass of 100 kg (left-block) is connected to another block of mass M (right-block) by a cable that passes over a fixed drum as shown below. The coefficient of static friction between the left-block and the floor is 0.45, between the right-block and floor is 0.4, and between the cable and the fixed drum is 0.25. Ignore tipping (overturning). Determine the minimum mass of the left-block for which motion does not occur.
In the photo, the man has a mass of 60 kg and the crate has a mass of 100 kg. The coefficient of static friction between his shoes and the ground is μs = 0.4 and between the crate and the ground is μc = 0.3. a) Determine if the man is able to move the crate using the rope-and-pulley system shown. b) Prove your answer to part A by calculating the static frictional force F between the man's shoes and the ground required to move the crate and the maximum static frictional force Fmax which can be developed. Express your answers in newtons to three significant figures separated by a comma.
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