Physics

Physics · mechanics

Problem

A copper bar of length 90 cm and cross section:

3.20 \, \mathrm{cm}^{2}

is attached, end to end, to a steel bar of length

L

and cross section:

6.40 \, \mathrm{cm}^{2}

. The composite bar is subjected to equal and opposite tensions of

3,000 \, \mathrm{kg}

at its ends. Calculate: a) The length of the steel bar if the elongations of both bars are equal. b) The fatigue of each bar. c) The final length of the bar. We know that Young's Modules for steel and copper are:

2 \times 10^{4} \, \mathrm{kg} / \mathrm{mm}^{2}

10^{4} \, \mathrm{kg} / \mathrm{mm}^{2}

respectively.

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