547_Dynamics 11ed Manual

547_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 17 Problem 17-57 The pendulum consists of a disk of weight W 1 and a slender rod of weight W 2 . Determine the horizontal and vertical components of reaction that the pin O exerts on the rod just as it passes the horizontal position, at which time its angular velocity is ω . Given: W 1 15 lb = a 0.75 ft = 8 rad s = W 2 10 lb = b 3f t = Solution: I O 1 2 W 1 g a 2 W 1 g ab + () 2 + 1 3 W 2 g b 2 + = Guesses α 10 rad s 2 = O x 100 lb = O y 5lb = Given O y W 1 W 2 W 1 g + W 2 g b 2 = O x W 1 g + 2 W 2 g b 2 2 + = W 1 + W 2 b 2 + I O = O x O y
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