Calculating Torque by Muscle: Bicep Flexor Force & Upper Arm Bone Force

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    Muscle Torque
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The discussion focuses on calculating the forces involved in holding a 196 N ball with the forearm horizontal, specifically the bicep flexor force (Fb) and the force exerted by the upper arm bone at the elbow joint. The bicep flexor muscle applies a torque around the elbow joint, which is essential for supporting the weight of the ball and the forearm, which weighs 22 N. The calculated magnitude of the bicep flexor force is 1339.08 N. Additionally, the discussion hints at needing to determine the force from the upper arm bone, although specific calculations for that force are not provided. Understanding these forces is crucial for analyzing muscle mechanics and torque in the human arm.
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A man holds a 196 N ball in his hand with the forearm horizontal as shown on the drawing to the left. He can support the ball in this position because of force, Fb from his bicep flexor muscule which is applied perpendicular to the forearm. This force applies a torque about the elbow joint.
Let's assume the forearm weighs 22 N and that the distance between the elbow joint and the center of the ball is L= 0.326 m. The distance between the point where the tendon connects the bicep to the forearm and the center of gravity of the arm is x1 = 0.089 m. The distance between the point of connection of the tendon and the elbow joint is x2 = 0.05 m.

a) What is the magnitude of Fb?

b) What is the magnitude of the force applied by the upper arm bone to the forearm at the elbow joint?

not sure what to do for this one
 
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i found out that the magnitude of Fb is 1339.08 N
 
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