Respostas

2014-03-19T17:39:03-03:00

dados :                                                                                                                      Lo=100cm  Δl=??                                                                                                                                     Δt=20°c                                                                                                                        α=24·10^-6° C-1                                                                                                                                                                                                                                aplicando os dados em:                                                                                                                          Δl=Lo·α·Δt                     Δl=100·24·10^-6·20                                                                                                       Δl=48·10^-3                                                                                                                 Δl=0,048cm

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2014-03-19T17:55:42-03:00
A fórmula de dilatação linear é:

ΔL = α * L° * Δt

ΔL = 0,048cm
α = ?
L° = 100 cm
Δt = ( T final - T inicial)
Δt = ( 20-0)=20

Substituindo na fórmula:
0,048 = α *  100  * 20
0,048 = α *2000
0,048 / 2000 = α
α = 2,4 * 10^-5

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