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225_Dynamics 11ed Manual

# 225_Dynamics 11ed Manual - Engineering Mechanics Dynamics...

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Engineering Mechanics - Dynamics Chapter 13 Given F cos ψ () N C cos M r'' r θ ' 2 ( ) = F sin N C sin + Mr '' 2 r' ' + = F N C Find FN C , = F N C 10.2 13.7 N = *Problem 13-104 The smooth surface of the vertical cam is defined in part by the curve r = ( a cos + b ). The forked rod is rotating with an angular acceleration '' , and at angle the angular velocity is ' . Determine the force the cam and the rod exert on the roller of mass M at this instant. The attached spring has a stiffness k and an unstretched length l . Given: a 0.2 m = k 100 N m = 45 deg = b 0.3 m = l 0.1 m = ' 6 rad s = g 9.81 m s 2 = M 2kg = '' 2 rad s 2 = Solution: ra cos b + = r' a sin ' = r'' a cos ' 2 a ( )sin '' = atan r ' r' π + = Guesses F N 1N = F = Given F N sin Mg sin kr l M r'' r ' 2 = FF N cos cos '' 2 r'
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