Determine the moments acting at the ends of each member. Assume the supports at A and Dare fixed. The moment of inertia of each member is indicated in the figure. E = 29(10°) ksi. Prob. 11-24 6 k/ft Isc = 1200 in C 10 ft IcD = 600 in D 15 ft LAB= 800 in 24 ft

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.