Chris jumps off a bridge with a bungee cord (a
Chapter , Problem 103(choose chapter or problem)
Chris jumps off a bridge with a bungee cord (a heavystretchable cord) tied around his ankle, Fig. 8-47. He fallsfor 15 m before the bungee cord begins to stretch. Chrissmass is 75 kg and we assume the cord obeys Hookes law,F = kx, with k = 50N/m. If we neglect air resistance,estimate how far below the bridge Chriss foot will be beforecoming to a stop. Ignore the mass of the cord (not realistic,however) and treat Chris as a particle.FIGURE 8-47 103. (a) Bungee jumperabout to jump, (b) Bungee cord at its unstretchedlength, (c) Maximum stretch of cord.
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