The drawing shows an outstretched arm 061 m in length that i

The drawing shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 136-N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the drawing, at a point that is 0.069 m from the shoulder joint and oriented at an angle of 29degree . The arm h a weight of 43 N and a center of gravity (eg) that is located d = 0.25 m from the shoulder joint. Find the magnitude of

Solution

The net torque is zero

( 136 * 0.61 ) - (43 * 0.25) - M [0.069 * sin 29] = 0

M = ( 136 * 0.61 ) - (43 * 0.25) / [0.069 * sin 29]

M = 2158 N