2.7 The wires AB and AC are made of steel, and wire AD is made of copper. Before the 150-lb force is applied, AB and AC are each 60 in. long and AD is 40 in. long. If the temperature is increased by 80F, determine the force in each wire needed to support the load. Take E(st) = 29(10^3) ksi, E(cu) = 17(10^3) ksi, a(st) = 8(10^-6)/F, a(cu) = 9.60(10^-6)/F. Each wire has a cross-sectional area of 0.0123 in^2. B 60 in. 45° D 40 in. -45° A 150 lb 60 in. C

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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.