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# written10 - Homework 10 Due 1 A crude model of an arm and...

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Homework 10 Due March 27 2007 1. A crude model of an arm and its biceps muscle is shown in the figure below. Assume that the mass of the arm and biceps muscle are negligible. a. What magnitude of force (in lb) must the biceps muscle provide for the arm to hold a 10-lb mass in the orientation shown? (As you will see from your answer, the arm is very inefficient lever. The great advantage of the system arises in the ability of the arm to move freely and throw objects at high speed) b. Find the total force exerted on the elbow. (CONTINUED NEXT PAGE) lb

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Homework 10 Due March 27 2007 2. A small particle of mass m slides without friction in a spherical bowl of radius r . a. Show that the motion of the particle is the same as if it were attached to a string of length r . b. The figure below shows two particles of masses m and 2 m that are simultaneously released from distances s and 3 s from the bottom of the bowl, where s is much smaller than the radius of the bowl. Where do they meet?
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