Two metre scales, one of steel and the other of aluminium, agree at 20∘C. Calculate the ratio aluminium-centimetre/steel-centimetre at (a) 0∘C, (b) 40∘C and (c) 100∘C. α for steel = 1.1×10−5 ∘C−1 and for aluminium = 2.3×10−5 ∘C−1.

Two metre scales, one of steel and the other of aluminium, agree at 20

1.	Two metre scales, one of steel and the other of aluminium, agree at 20∘C. Calculate the ratio aluminium-centimetre/steel-centimetre at (a) 0∘C, (b) 40∘C and (c) 100∘C. α for steel = 1.1×10−5 ∘C−1 and for aluminium = 2.3×10−5 ∘C−1.
Answer» Two metre scales, one of steel and the other of aluminium, agree at $20^{\circ} C$ . Calculate the ratio aluminium-centimetre/steel-centimetre at (a) $0^{\circ} C$ , (b) $40^{\circ} C$ and (c) $100^{\circ} C$ . $α$ for steel = $1.1 \times 10^{- 5}^{\circ} C^{- 1}$ and for aluminium = $2.3 \times 10^{- 5}^{\circ} C^{- 1}$ .

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Two metre scales, one of steel and the other of aluminium, agree at 20∘C. Calculate the ratio aluminium-centimetre/steel-centimetre at (a) 0∘C, (b) 40∘C and (c) 100∘C. α for steel = 1.1×10−5 ∘C−1 and for aluminium = 2.3×10−5 ∘C−1.

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