665_Dynamics 11ed Manual

665_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 19 Problem 19-53 The plank has a weight W , center of gravity at G , and it rests on the two sawhorses at A and B . If the end D is raised a distance c above the top of the sawhorses and is released from rest, determine how high end C will rise from the top of the sawhorses after the plank falls so that it rotates clockwise about A , strikes and pivots on the sawhorses at B , and rotates clockwise off the sawhorse at A . Given: W 30lb = b 1.5ft = a 3ft = c 2ft = Solution: I G 1 12 W g 4 ab + () 2 = I A I G W g b 2 + = Guesses ω 1 1 rad s = 2 1 rad s = θ 1deg = h 1ft = Given W b 2 ba + c 1 2 I A 1 2 = I G 1 W g 1 bb + I A 2 = Wb sin 1 2 I A 2 2 = ha 2 b + ( )sin = 1 2 h Find 1 2 , , h , = 1 2
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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