Consider holding a carton of milk in your hand. The force of the bicep muscle ac

Question

Consider holding a carton of milk in your hand. The force of the bicep muscle acts at an angle of 15degree 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 the distal bicep tendons to the radius and ulna bones is 5 cm. The distance from the elbow to the center of mass of the forearm is 16.5 cm and 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.

Explanation / Answer

Distance throught which the becep tension works

= x = 5*sin 75

=5.176 cm

Moment @ elbow

Counter clockwise = clockwise

F*x = 4*9.81*16.5 + 2*9.81*35

Where F = tension in biceps

F= 257.76 N

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