Jawabanmu

2014-04-29T19:47:58+07:00
 L_{0} = 2 m
 t_{0} = 25°C
T  = 40°C
α  =  0,000011°C

Δt = t - t°
    = 40°C - 25°C
    = 15°C

L =  L_{0} (1 + αΔt)
   = 2 ( 1 + (0,000011)(15))
   = 2 (1 + 0,000165)
   = 2 (1,000165)
   = 2,0033 m

Jadi panjang besi itu pada suhu 40°C adalah 2,0033 m
3 4 3
2014-04-29T20:03:39+07:00
L2=l1(0,000011+1[40-25]
l2=200cm/2m×1,000011×15
l2=2,000022×15
l2=30,00033m