Answered: FIGURE 5.33 A leg in traction. ´pulley…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: Newton's Laws Of Motion

Section: Chapter Questions

Problem 7CQ: (a) What force causes an automobile to move? (b) A propeller-driven airplane? (c) A rowboat?

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For serious fractures of the leg, the leg may need to have a stretching force applied to it to keep contracting leg muscles from forcing the broken bones together too hard. This is often done using traction, an arrangement of a rope, a weight, and pulleys as shown. The rope must make the same angle u on both sides of the pulley so that the net force of the rope on the pulley is horizontally to the right, but θ can be adjusted to control the amount of traction. The doctor has specified 50 N of traction for this patient, with a 4.2 kg hanging mass. What is the proper angle θ?

FIGURE 5.33 A leg in traction.
´pulley
leg
on
4.2 kg

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