A cable passes around three 2-in.-radius pulleys and supports two blocks as shown. Pulleys C and E are locked to prevent rotation and the coefficients of friction between the cable and the pulleys are μs =0.20 and μk =0.15. Determine the range of values of the weight of block A for which equilibrium is maintained
(a) If pulley D is locked,
(b) If pulley D is free to rotate.

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6 in. 16 lb 8 in. WA