The steel (Est = 200 GPa) shaft shown in composed of two hollow pipes AB and BC. The cross- sectional area of pipe AB is AAB= 790 mm2, and the cross-sectional area of pipe BC is ABC = 350 mm2. Determine the magnitude of the force P, applied at C as shown, required to close the %3D 0.15mm gap between the wall and C. Express your answer in kN to the nearest 100 N. -600 mm - 600 mm -0.15 mm P [A 50 mm B 25 mm

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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.