A man stands on his right foot with his left knee at a 120° angle. The mass of his foot and lower leg is 4.5kg and its center of mass is 30cm from the knee joint. How much torque (in Nm) must his hamstring muscles produce to maintain his knee at this angle? (Equation below).

A man stands on his right foot with his left knee at a 120° angle. The mass of his foot and lower leg is 4.5kg and its center of mass is 30cm from the knee joint. How much torque (in Nm) must his hamstring muscles produce to maintain his knee at this angle? (Equation below).

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

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A man stands on his right foot with his left knee at a 120° angle. The mass of his foot and lower leg is 4.5kg and its center of mass is
30cm from the knee joint. How much torque (in Nm) must his hamstring muscles produce to maintain his knee at this angle?
(Equation below).
...
Hamstring
120
30cm
lower leg +
foot =4.5kg'
30cm
lower leg +
foot =4.5kg
120- 90 -30 from the harizortal plare
tarque 4kg 81 ms x(030m) cos 30
0.30m
Round your answer to 1 decimal place.
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