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posted by  virgil87 on 7/17/2008 2:03:46 AM  |  status: Live  

4.120

Course Textbook Chapter Problem
Classical Mechanics Vector Mechanics for Engineers: Statics (8th) by Johnston, Eisenberg, Beer 4 120
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Can anyone help me with this problem? I've noticed no one has been able to answer it at all.

The lid of a roof scuttle weighs 75lb. It is hinged at corners A and B and maintained in the desired position by rod CD pivoted at C; a pin at end D of the rod fits into one of several holes drilled in the edge of the lid. For the position shown, determine (a) the magnitude of the force exerted by rod CD, (b) the reactions at the hinges. Assume that the hinge at B does not exert any axial thrust. 

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