A belt of negligible mass passes between cylinders A and B and is pulled to the right with a force P. Cylinders A and B weigh, respectively, 5 and 20 lb. The shaft of cylinder A is free to slide in a vertical slot and the coefficients of friction between the belt and each of the cylinders are μ_s = 0.50 and μ_k = 0.40. For P = 3.6 lb, determine 

(a) Whether slipping occurs between the belt and either cylinder, 

(b) The angular acceleration of each cylinder.

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A B Fig. P16.39 4 in. 8 in. P