A rotating drum is pivoted at O2 and is decelerated by the double-shoe brake mechanism. The weight and radius of gyration of the drum are 230 lb and 5.66 in, respectively. The brake is actuated by the force P = −100ˆj lb. Assume that the contact points between the two shoes and the drum are C and D, where the coefficients of Coulomb friction are μ = 0.300. Determine the angular deceleration of the drum and the reaction force, F12, at the fixed pivot.

Figure P12.27