Respostas

2013-07-16T21:21:47-03:00
R  = 0,02 m
S0 =3,14*0,02² = 0,001256 m² = 1,256*10^-3 m²
beta = 2*alfa = 2*1,2*10^-5 = 4,2*10^-5 /°C

delta S = 1,256*10^-3 * 4,2*10^-5 * (108 - 8)

delta S = 527,52*10^-8 m²

delta S = S - S0

S = delta S + S0

S = 527,52*10^-8 + 1,256*10^-3 

S = 527,52*10^-8 + 125.600*10^-8

S = 126.127,52*10^-8

S = 0,00126127 m²


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