Question

Design a "bungee jump" apparatus for adults. A bungee jumper falls from a high platform with two elastic cords tied to the ankles. The jumper falls freely for a while, with the cords slack. Then the jumper falls an additional distance with the cords increasingly tense. Assume that you have cords that are 9 m long, and that the cords stretch in the jump an additional 25 m for a jumper whose mass is 80 kg, the heaviest adult you will allow to use your bungee jump (heavier customers would hit the ground).

a. Focus on this instant of greatest tension and, starting from a fundamental principle, determine the spring stiffness,k , for each of the two cords.

b. What is the maximum tension that each one of the two cords must support without breaking? (This tells you what kind of cords you need to buy.)

c. What is the maximum tension that each one of the two cords must support without breaking? (This tells you what kind of cords you need to buy.)

Please explain, thank you

Answer 1

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