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42. Steel Rope What is the change of the length of a steel rope of length L 9km if: a) it hangs in an empty hole? (1P) b) it is sunk into the sea? (1P) What is the maximum length of the rope in the hole, so that it does not rupture (1P) (Youngs modulus: Esteel-2. 1011 N/m2, densities: psteel-7.8-103 kg/m3, psaltwater -1.03-103 kg/m3, ultimate strength: ơu-4-108 N/m2)

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