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A circular steel rod ten feet in length, of cross-section area, 2in², is loaded to its yield point stress.
The modulus of elasticity of the steel is 30x10^{6} lbf/in^{2} and its yield point stress is 36,000 lbf/in^{2}. The event is that the rod is loaded smoothly to its yield point stress.

**Calculate the force, elongation and work.**

The **force** required to stretch the rod to its yield point stress is:

From Hooke's Law we obtain the strain at yield point stress and the **elongation**.

The work of the system (the rod) is: