Aman is holding a 6.0-kg (weight = 59 n) dumbbell at arm's length, a distance of 0.56 mfrom his shoulder. what is the torque on the shoulder joint from the weight of the dumbbell if thearm is held at 15° above the horizontal? on the picture, draw the lever arm for this force

Explanation:

As we know that torque due to a force is given by the formula

here we know that force is exerted due to weight of the mass hold in his hand

so we have

F = mg = 59 N

Now Lever arm is the perpendicular distance on the line of action of force from the axis about which the system is rotated

so here we can say

now we have