Asked by Josh

A person rappels down a cliff. The person uses a 0.5 inch diameter rope, creating a 170-lb internal force. What is the normal stress in the rope.

I got 340 by diving 170 from .5 is this right?
Answered by drwls
No. You have to divide the tension by the area of the rope's cross section, (pi/4)*(0.5)^2 = 0.196 in^2, NOT the diameter. The answer will be in pounds per square inch (psi), if you do.
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