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The figure shows the forearm of a person holding a book with the upper arm and the forearm forming an angle of 125. The biceps

The figure shows the forearm of a person holding a book with the upper arm and the forearm forming an angle of 125∘. The biceps exert a force FB→ on the forearm, and FE→ is the force of the elbow joint. The forearm has a mass of 2.5kg, and the book has a mass of 1.8 kg

Calculate the magnitude of the force in the elbow joint in units of newtons.


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