An arm has a mass of 7.0 kg. Treating the arm as if it were a single point mass m attached to a rigid massless rod, determine the work that must be done by the deltoid muscle to move the arm from position 1 to position 2. (Position one and two have an angle of 30 degrees between them and it is 21.0 cm from the shoulder to the elbow of the arm)(adsbygoogle = window.adsbygoogle || []).push({});

By doing a little trigonometry, I figured out that the distance between position 1 and position 2 is about 0.12m. I will use the equation

W(for work)=F*delta x*cos(angle)

How do I find the force applied to move it from position one to two?

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# Homework Help: Work Problem

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