Solve Problem 8.19 assuming that the coefficients of friction at B are zero.
PROBLEM 8.19
Wire is being drawn at a constant rate from a spool by applying a vertical force P to the wire as shown. The spool and the wire wrapped on the spool have a combined weight of 20 lb. Knowing that the coefficients of friction at both A and B are μs = 0.40 and μk = 0.30, determine the required magnitude of the force P.

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3 in. 3 in,