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Please explain where certain numbers come from, thank you!A vertical hollow steel tube is 2.5 m long. Its internal diameter is 5 cm and its external diameter is 6 cm. Calculate the increase in length of the tube when a load of 1.5 x 10 kg is suspended from the lower end. For steel Youngs modulus is 21 x 1010 N m2 and the shear modulus is 8.3 x 1010 N m-

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