658_Dynamics 11ed Manual

658_Dynamics 11ed Manual - r 3 a 2 + = 2 0.0906 rad s =...

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Engineering Mechanics - Dynamics Chapter 19 Problem 19-41 Rod ACB of mass m r supports the two disks each of mass m d at its ends. If both disks are given a clockwise angular velocity ω A1 = Β1 = 0 while the rod is held stationary and then released, determine the angular velocity of the rod after both disks have stopped spinning relative to the rod due to frictional resistance at the pins A and B . Motion is in the horizontal plane. Neglect friction at pin C . Given: m r 2kg = m d 4kg = 0 5 rad s = a 0.75 m = r 0.15 m = Solution: 2 1 2 m d r 2 0 2 1 2 m d r 2 2 m d a 2 + m r 12 2a () 2 + ω = ω m d r 2 m d r 2 2 m d a 2 + m r
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Unformatted text preview: r 3 a 2 + = 2 0.0906 rad s = Problem 19-42 Disk A has a weight W A . An inextensible cable is attached to the weight W and wrapped around the disk.The weight is dropped distance h before the slack is taken up. If the impact is perfectly elastic, i.e., e = 1, determine the angular velocity of the disk just after impact. Given: W A 20 lb = h 2 ft = W 10 lb = r 0.5 ft = Solution: v 1 2 gh = Guess 2 1 rad s = v 2 1 ft s = 656...
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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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