294_Dynamics 11ed Manual

294_Dynamics 11ed Manual - off the bridge from rest using...

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Engineering Mechanics - Dynamics Chapter 14 T C M v C 2 2 r g = T C 48.7 N = Problem 14-82 The spring has stiffness k and unstretched length L . If it is attached to the smooth collar of weight W and the collar is released from rest at A , determine the speed of the collar just before it strikes the end of the rod at B . Neglect the size of the collar. Given: k 3 lb ft = c 3f t = L 2f t = d 1f t = W 5lb = e 1f t = a 6f t = f 2f t = b 4f t = g 32.2 ft s 2 = Solution: T A V A + T B V B + = 0 Wa f () + 1 2 ka 2 b 2 + d 2 + L () 2 + 1 2 W g v B 2 1 2 kc 2 e 2 + f 2 + L () 2 + = v B 2 ga f () kg W a 2 b 2 + d 2 + L () 2 c 2 e 2 + f 2 + L () 2 + = v B 27.2 ft s = Problem 14-83 Just for fun, two engineering students each of weight W , A and B
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Unformatted text preview: off the bridge from rest using an elastic cord (bungee cord) having stiffness k . They wish to just reach the surface of the river, when A , attached to the cord, lets go of B at the instant they touch the water. Determine the proper unstretched length of the cord to do the stunt, and calculate the maximum acceleration of student A and the maximum height he reaches above the water after the rebound. From your results, comment on the feasibility of doing this stunt. 292...
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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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