A metal wire 3.50 m long and 0.70 mm in diameter was given the following test A load weighing 20 N was originally hung from the wire to keep it taut. The position of the lower end of the wire was read on a scale as load was added.
(a) Graph these values, plotting the increase in length horizontally and the added load vertically.
(b) Calculate the value of Young's modulus.
(c) The proportional limit occurred at a scale reading of 3.34 cm. What was the stress at this point?

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Scale Reading (em) Added Load (N) 3.02 10 3.07 20 3.12 3.17 30 3.22 40 50 3.27 60 3.32 4.27 70