256_Dynamics 11ed Manual

256_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 14 Solution: N B Mg k ab x + sin θ () 0 = N B Mg k sin () ab x + + = U x 1 x 2 x k cos () ab x + d μ k x 1 x 2 x Mg k sin () ab x + + d = U 173.177 N m = 1 2 Mv 1 2 U + 1 2 Mv 2 2 = v 2 v 1 2 2 U M + = v 2 15.401 m s = * Problem 14-20 The motion of a truck is arrested using a bed of loose stones AB and a set of crash barrels BC . If experiments show that the stones provide a rolling resistance F t per wheel and the crash barrels provide a resistance as shown in the graph, determine the distance x the truck of weight W penetrates the barrels if the truck is coasting at speed v 0 when it approaches A . Neglect the size of the truck. Given: F t 160 lb = d 50 ft = W 4500 lb = k 1000 lb ft 3 = v 0 60 ft
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