# 9.19 - Problem 9.19 Each box weighs[0 lb The coefﬁcient...

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Unformatted text preview: Problem 9.19 Each box weighs [0 lb. The coefﬁcient of static friction between box A and box 8 is 0.24, and the coefﬁcient of static friction between box B and the inclined surface is 0.3. What is the largest angle a for which box B will not slip? Strategy: Draw individual freeibody diagrams of the two boxes and write their equilibrium equations assuming that slip of box B is impending. Solution: We have 6 unknowns. 4 equilibrium equations and 2 IO") friction equations ZFA/IT— I0lbsinaﬁf2=0 ZFA\:N2—]01bcosa=0 Era/:foI a lOlbsina=0 ZFB'\:NE —N2-101bC050t=0 f1=0.3Ni. f2 2\$0.24ng Solving we ﬁnd ...
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