Question

Dr. Ben Blalock has hired us to determine the length of the power lines between two towers, and the tension in the power line. We do this by sending a longitudinal pulse and then a transverse pulse down the line. It takes 0.15 sec for the longitudinal pulse to return, and 1.4 sec for the transverse pulse to return. The power lines are made of 1.9 inch diameter aluminum wire, with E=10.8x10⁶ psi and weighing 175 lb/ft³.

A. What is the length of the power line? Answer: 1269 ft

B. What is the tension in the power line?

Answer 1

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