1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Force of a muscle

  1. Oct 22, 2006 #1
    A person exerts a horizontal force |F| = 192 N in the test apparatus shown in the drawing. Find the horizontal force M (magnitude and direction) that is flexor muscle exerts on his forearm. (L = 0.31 m, h = 0.047 m)

    http://img238.imageshack.us/img238/1465/c9p17iy6.jpg [Broken]

    I know that the torque for the .31m length is equal to 59.52 Nm; how do I begin to solve the force M for the second length of .047m?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Oct 22, 2006 #2


    User Avatar
    Science Advisor

    The sum of the moments about the elbow joint must = 0.
  4. Oct 22, 2006 #3
    does this mean I can calculate the torque for both points and add them in an equation and set them equal to 0?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook