Just like the image below, assume you are holding a 15 lbs ball in your hand that is perpendicular to your body.  your arm itself weighs 5 lbs. The distance from the ball in hand to the elbow  (dball) is 6cm. The distance from the elbow to the biceps (dbiceps) is 2cm. The center of mass is the center of your arm. Please draw a free body diagram, find the pivot point, and include all the forces acting in the diagram. Please write an equation for torque and calculate the value of the force that the muscle puts on the arm in pounds.

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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.