Question 32 of 37 Incorrect Map UNIVERSITY PHYSICS this question has been custom

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Question 32 of 37 Incorrect Map UNIVERSITY PHYSICS this question has been customized by (Exam Like Question) Philip R. Kesten David L. Tauck Kristina Callaghan at Harvard University The bones of the forearm (radius and ulna) are hinged to the humerus at the elbow. The biceps muscle connects to the bones of the forearm about 2.15 cm beyond the joint. Assume the forearm has a mass of 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 5.75 kg so that her forearm remains motionless, what is the force exerted by the biceps muscle? Number Tools Muscle 10 Humerus Radius Elbow Ulna Hand G Previous Give Up & View solution Check Answer Next Ext B Hint

Explanation / Answer

let force exerted by bicep be F, and normal reaction by palm on the object be N

F + N = 57.5 + 24.5 = 82 N

and the torque balance equation is : 24.5*21.1 + (N - 57.5)*44.35 = 0

from this we get N = 45.84

so F is 82-45.84 = 36.16 N

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