An iron rod of length 50 cm is joined at an end to an aluminum rod of length 100cm. All measurement refer to 20∘C. Find the length of the composite system at 100∘C and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminum are 12×10−6/∘C and 24×10−6/∘C respectively.

An iron rod of length 50 cm is joined at an end to an aluminum rod of

1.	An iron rod of length 50 cm is joined at an end to an aluminum rod of length 100cm. All measurement refer to 20∘C. Find the length of the composite system at 100∘C and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminum are 12×10−6/∘C and 24×10−6/∘C respectively.
Answer» An iron rod of length 50 cm is joined at an end to an aluminum rod of length 100cm. All measurement refer to $20^{\circ} C$ . Find the length of the composite system at $100^{\circ} C$ and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminum are $12 \times 10^{- 6} /^{\circ} C$ and $24 \times 10^{- 6} /^{\circ} C$ respectively.

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