290_Dynamics 11ed Manual

290_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 14 Problem 14-77 The collar of weight W is released from rest at A and travels along the smooth guide. Determine its speed when its center reaches point C and the normal force it exerts on the rod at this point. The spring has an unstretched length L , and point C is located just before the end of the curved portion of the rod. Given: W 5lb = L 12 in = h 10 in = k 2 lb in = g 32.2 ft s 2 = Solution: T A V A + T C V C + = 0 WL + 1 2 kh 2 + 1 2 W g v C 2 1 2 kL 2 h 2 + L () 2 + = v C 2 gL kg W h 2 + W L 2 h 2 + L 2 = v C 12.556 ft s = N C 2 h 2 + L L L 2 h 2 + + W g v C 2 L = N C W g v C 2 L L 2 h 2 + L 2 h 2 + L = N C 18.919 lb = Problem 14-78 The firing mechanism of a pinball machine consists of a plunger
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