ch18-p086 - 86. From the law of cosines, with = 59.95, we...

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86. From the law of cosines, with φ = 59.95º, we have L 2 Invar = L 2 alum + L 2 steel 2 L alum L steel cos φ Plugging in L = L 0 (1 + Įǻ T ), dividing by L 0 (which is the same for all sides) and ignoring terms of order ( ǻ T ) 2 or higher, we obtain 1 + 2 Į Invar ǻ T = 2 + 2 ( Į alum + Į steel ) ǻ T– 2 (1 + ( Į alum + Į steel ) ǻ T ) cos φ . This is rearranged to yield
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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