780_Dynamics 11ed Manual

780_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 21 Given: W 8lb = θ 90 deg = r 0.3 ft = g 32.2 ft s 2 = L 0.5 ft = ω s 300 rad s = Solution: Σ M x I φ ' 2 sin () cos () I z ' sin () ' cos () ψ ' + () + = Guess p 1 rad s = Given WL sin () W g r 2 4 W g L 2 + p 2 sin () cos () W g r 2 2 p sin () p cos () s + () + = p Find p () = p 1.19 rad s = *Problem 21-72 The top has weight W and can be considered as a solid cone. If it is observed to precess about the
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