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t1(suhu awal). = 20°c
∆t(selisih suhu) 80°c-60°c=20°c
a = 0,000011/°c
ditanyakan = lt (panjang akhir)
jawab :∆l=lo x a x ∆t
= 2 x 0,000011 x 60
= 0,00132
lt = lo + ∆t
= 2 + 0,00132
= 2,00132