Respostas

2014-08-03T19:33:27-03:00
T0=30
t=230
Δt=230-30=200
L0=400
L=4002
ΔL=4002-400=3602
ΔL=L0.α.Δt
3602=400.α.200
80000α=3602
α=3602/800000
α=0,04