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1) As structural steel rod has a radius R = 9.5 mm and a length L = 81 cm. A force F = 6.2 × 104 N (about 7 tons) stretches it along its length.
(a) What is the tensile stress in the rod?
Note: Tensile stress is the Force of the load per unit area of the rod's surface.
(b) What is the elongation (d) of the rod under this load? What is the strain?
Note: Strain is the ratio between the elongation of the rod, and the rod's original length without the load.
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