former student of mechanics wishes to weigh himself but has access only to a scale A with capacity limited to 100 lb and a small 20-lb spring dynamometer B. With the rig shown he discovers that when he exerts a pull on the rope so that B registers 19 lb, the scale A reads 67 lb. What is his correct weight?
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If a system is in the position of static equilibrium them the summation of all the forces and moments acting on its must cause no effect on the static of the system.
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