Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 0 = 30° and P=45 lb. Given: μs = 0.30 and k = 0.20.250 lbThe block is not in equilibrium and moves down.TrueThe magnitude and direction of friction force is86.03 lb 7

To check: Whether the block is in equilibrium or not and The magnitude and direction of the friction…

Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 8 = 30° and P= 45 lb. Given: μs = 0.30 and μk = 0.20. 250 lb The block is not in equilibrium and moves down. True The magnitude and direction of friction force is 86.03 lb 7

Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 8 = 30° and P= 45 lb. Given: μs = 0.30 and μk = 0.20. 250 lb The block is not in equilibrium and moves down. True The magnitude and direction of friction force is 86.03 lb 7

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 7.59P: How many turns of rope around the capstan are needed for the 40-lb force to resist the 8000-lb pull...

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Question

Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when 0 = 30° and P=
45 lb. Given: μs = 0.30 and k = 0.20.
250 lb
The block is not in equilibrium and moves down.
True
The magnitude and direction of friction force is
86.03 lb 7

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This is still the wrong answer for McGraw Hill. Each answer I try is wrong, so not sure if I'm doing the problem wrong. It's not 71.70 or 71.07.

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71.7 is being marked wrong in McGraw Hill homework. I thought I had done it right with putting 86.03 but that is wrong also. I'm not trying to just find the answer, trying to find how to do this. Could there be a different number than 71.7? Where does the μk=0.20 come into the equation?

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