Jawabanmu

2014-04-20T18:57:37+07:00
 Δl = lo α Δt
 Δl = 20 0,000012 15
 Δl = 3,6×10^(-3) meter
2014-04-20T20:38:51+07:00
DeltaL=LoxalfaxdeltaT =20x0,000012x15 =0,0036 cm.