iversity Physics The bones of the forearm (radlus and ulna) are hinged to the hu

Question

iversity Physics The bones of the forearm (radlus and ulna) are hinged to the hurnerus at the elbow. The bieps muscle connects to the 2.45 kg and a length of 0.465 m. When the humerus and the biceps are nearly vertical and the forearm is horizontal, If a person wishes to hold an object of mass 6.55 kg so that her forearm remains motionless what is the force exerted by the biceps muscle? of the forearm about 2.15 cm he joint. Assume the forearm has a mass of Number Muscle Humerus- Radius Elbow Ulna Hand O Previous @ Give Un & Vew Soution Check Answer Next xt

Explanation / Answer

Here,

let the force exerted by the biceps is F

Now, balancing the torque about the elbow joint

F * 0.0215 - 2.45 * 9.8 * 0.465/2 - 6.55 * 9.8 * 0.465 = 0

solving for F

F = 1648 N

the force exerted by the biceps muscle is 1648 N

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