# Physics

posted by Carolyn

Consider holding a carton of milk in your hand. The force of the bicep muscle actsat an angle of 15 degrees to the vertical, while the weight of the arm and the milk both act downwards. The distance from the elbow to where the bicep muscle is attached via the distal bicep tendons to the radius and ulna bones is 5 cm. the distance from the elbow to the hand, holding the milk, is 35 cm. the forearm has a mass of 4 kg and the milk carton a mass of 2 kg. Assuming the forearm is kept perfectly horizontal, find the tension in the bicep muscle. As a function of the angle of the forearm with respect to the horizontal direction ( as the forearm is lowered) calculate the tension in the bicep muscle. Include a plot of tension in the bicep as a function of the angle of the forearm relative to the horizontal

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