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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01T Fall Term 2004 InClass Problems 1719: Static Equilibrium Solutions InClassProblem 17 Static Equilibrium: Forearm The human forearm (including the hand) can be regarded as a lever pivoted at the joint of pulled upward by the tendon of the biceps r F acting on the forearm at the elbow. The forearm is r T d which connects to the forearm a distance r T makes an angle of the elbow with a downward force from the joint. The tendon 90 0 with the horizontal. The forearm and hand have a mass of m 1 . Assume the center of mass of the forearm and hand is a distance x from the joint. Suppose an object of mass m 2 rests in the hand a distance cm 2 x away from the joint of the elbow. See the accompanying figure. cm a) What are the equations for static equilibrium of the forces? b) About point will you choose to analyze the torques? What are the equations for static equilibrium of the torques? c) What upward force r T must the tendon exert to keep the forearm horizontal? d) What is the downward force r F on the forearm at the elbow joint? 1 2 InClassProblem 18 Static Equilibrium: Suspended Beam A rod of length 2.0 m and mass 4.0 kg is hinged to a wall at one end and suspended from the wall by a cable which is attached to the other end of the rod at an angle of = 30 o to the rod (see sketch). Assume the cable is massless. There is a pivot force acting on the the rod (see sketch)....
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 Spring '08
 WHITE
 Physics, Mass, Static Equilibrium

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