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The three bars have a weight of W₁ = 20 lb, WB = 40 lb, and Wc = 60 lb, respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. Hint: To answer this question you need to test which blocks are slipping (A alone OR A&B together). Finally, (answer as a sentence) how would you describe the friction between the blocks that are NOT slipping? Would F=μs be applicable? 91 7989 de sa suv CCB=0.5 BBA=0.3 AμAD=0.2 P D

The three bars have a weight of W₁ = 20 lb, WB = 40 lb, and Wc = 60 lb, respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. Hint: To answer this question you need to test which blocks are slipping (A alone OR A&B together). Finally, (answer as a sentence) how would you describe the friction between the blocks that are NOT slipping? Would F=μs be applicable? 91 7989 de sa suv CCB=0.5 BBA=0.3 AμAD=0.2 P D

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The three bars have a weight of W₁ = 20 lb, WB = 40 lb, and Wc = 60 lb, respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. Hint: To answer this question you need to test which blocks are slipping (A alone OR A&B together). Finally, (answer as a sentence) how would you describe the friction between the blocks that are NOT slipping? Would F=μs be applicable? 91 7989 de sa suv CCB=0.5 BBA=0.3 AμAD=0.2 P D
Transcribed Image Text:The three bars have a weight of W₁ = 20 lb, WB = 40 lb, and Wc = 60 lb, respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. Hint: To answer this question you need to test which blocks are slipping (A alone OR A&B together). Finally, (answer as a sentence) how would you describe the friction between the blocks that are NOT slipping? Would F=μs be applicable? 91 7989 de sa suv CCB=0.5 BBA=0.3 AμAD=0.2 P D
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