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A compound bar 90 cm long is made of a rod of steel 30 cm long 3 cm diameter securely fastened to a rod of

A compound bar 90 cm long is made of a rod of steel 30 cm long 3 cm diameter securely fastened to a rod of copper 60 cm long. Under a pull of 50 kN the extensions in each portion are found to be equal. What is the diameter of the copper rod, in cm, Round your answer to one decimal place only

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