تم الحل ✓
categoryالفيزياء
schoolبكالوريوس
event_available2026-07-15
السؤال
Transcribed Image Text:
When bungee jumping from a high bridge over Victoria Falls, an operator first attaches an elastic rope to the jumper. The jumper then jumps off the bridge, falling freely until they reach the unstretched
length of the rope. Then, the rope begins to stretch and slows the jumper to a stop. The rope pulls the jumper back up, and they oscillate up and down for a while until the operator pulls the jumper
back up to the bridge.
The rope is essentially a long spring. Let's label the jumper's mass m, the unstretched length of the rope Lo, the height of the bridge above the water H, the elastic (spring) constant of the rope k, and
the gravitational field strength g. The jumper's speed at the point where they've fallen the full length of the unstretched rope is a maximum, Vmax. For simplicity, we will neglect resistive forces like air
drag.
The jumper has a mass of 60 kg, and the bridge's height above the river is 150 m. The rope has an unstretched length of 9 m and stretches a distance of 4 m before bringing the jumper to a stop.
Determine the maximum speed of the jumper and the spring constant of the rope. In your calculation, use g = 10 N/kg.
Vmax 13.416
k 31.22 x N/m
m/s
E.
Now suppose the jumper has a mass of 75 kg. Do you think the maximum speed of the jumper will increase, decrease, or stay the same? Will the rope need a larger, smaller, or the same spring constant
to bring the jumper to a stop in the same distance as part D? (Your answers to these questions are not graded for correctness.)
The maximum speed of the jumper will
stay the same
Score: 1 out of 1
Comment:
The rope will need a spring constant that is
larger
Score: 1 out of 1
Comment:
Now calculate the maximum speed of this more massive jumper and the spring constant of the rope needed to bring the jumper to a stop after the rope stretches 4 m. (Again, use g = 10 N/kg for your
calculations.) Were your predictions correct?
Vmax 13.416
m/s
k 34.91 N/m
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