# A daredevil plans to bungee-jump from a hot-air balloon 65.0 m above a carnival midway (Fig. P8.11).

A daredevil plans to bungee-jump from a hot-air balloon 65.0 m above a carnival midway (Fig. P8.11). He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and obeying Hookes law. In a preliminary test, hanging at rest from a 5.00-m length of the cord, the daredevil finds his body weight stretches the cord by 1.50 m. He intends to drop from rest at the point where the top end of a longer section of the cord is attached to the stationary hot air balloon. (a)

A daredevil plans to bungee-jump from a hot-air balloon 65.0 m above a carnival midway (Fig. P8.11). He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having negligible mass and obeying Hookes law. In a preliminary test, hanging at rest from a 5.00-m length of the cord, the daredevil finds his body weight stretches the cord by 1.50 m. He intends to drop from rest at the point where the top end of a longer section of the cord is attached to the stationary hot air balloon. (a) What length of cord should he use? (b) What maximum acceleration will he experience?

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