PROBLEM 10.20 A couple Mof magnitude 75 lb ft⋅is applied as shown to the crank of the engine system. Knowing that 2.5 in.AB=and 10 in.BC=, determine the force Prequired to maintain the equilibrium of the system when (a) 60 ,θ=°(b) 120 .=°SOLUTION From the analysis of Problem 10.19, ( )sincosMABPθφφ+=Now, with 75 lb ft900 lb in.M=⋅=⋅(a) For 60=°
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