Jawabanmu

2014-03-10T22:50:27+07:00
ΔL =  L_{0} . α . Δt
ΔL = 40. 0,00002 . 50 = 0,04 cm
L =  L_{0} + ΔL = 40 + 0,04 = 40,004 cm

2014-03-10T22:56:43+07:00
ΔL = L[0] * α * ΔT
ΔL = 40 * 0,00002 * 50
     = 0,0008 * 50
     = 0,04 cm

L = L[0] + ΔL
   = 40 + 0,04
   = 40,004 cm