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how much force is being exerted by the triceps?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter6: Beams And Cables

Section: Chapter Questions

Problem 6.5P: Find the internal force systems acting on sections 1 and 2.

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Question

A hand exerts a force of 125 N on a scale at 30 cm from the joint center at the elbow. If the triceps attaches to the ulna at a 90° angle and at a distance of 3.5 cm from the elbow joint center, and if the weight of the forearm and hand is 45 N with the hand/ forearm CG located 15 cm from the elbow joint center, how much force is being exerted by the triceps?

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