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A steel rod, circular in cross section, tapers from 2.5 cm diameter to 1.25 cm diameter in a length of 50 cm.

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A steel rod, circular in cross section, tapers from 2.5 cm diameter to 1.25 cm diameter in a length of 50 cm. Find how much of this length will increase under a pull of 25 kN if E = 210 GPa.

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Given: d1 = 1.25 cm, L = 50 cm, d2 = 2.5 cm, and P = 25 kN 

Extension of a tapering circular bar

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