A 20-1b force is applied to the control rod AB as shown. Knowing that the length

Question

A 20-1b force is applied to the control rod AB as shown. Knowing that the length of the rod is 9 in. and that alpha = 25 degree, determine the moment of the force about point B by resolving the force into horizontal and vertical components. A 20-lb force is applied to the control rod AB as shown. Knowing that the length of the rod is 9 in. and that alpha = 25 degree, determine the moment of the force about point B by resolving the force into components along AB and in a direction perpendicular to AB. A 20-lb force is applied to the control rod AB as shown. Knowing that the length of the rod is 9 in. and that the moment of the force about B is 120 lb middot in. clockwise, determine the value of alpha. A crate of mass 80 kg is held in the position shown. Determine (a) the moment produced by the weight W of the crate about E, (b) the smallest force applied at B that creates a moment of equal magnitude and opposite sense about E. A crate of mass 80 kg is held in the position shown. Determine

Explanation / Answer

3.1) Moment = 20cos25 * 9sin65 - 20sin25 * 9cos65 = 115.7 lb in 3.2) moment along AB will be zero as perpendicular distance = 0 Component of force perpendicular to AB = 20 cos(25+25) = 12.856N moment = 12.856*9 = 115.88 lb in

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