The coefficients of friction are μs = 0.40 and μk = 0.30 between all surfaces of contact....
The coefficients of friction are μs = 0.40 and μk = 0.30 between all surfaces of contact. Determine the smallest force P required to start the 30-kg block moving if cable AB (a) is attached as shown, (b) is removed.
Fig. P4.90
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