Jawabanmu

2014-05-06T21:20:01+07:00
Dik: delta t = 35-15 = 20 lo = 40m alfa = 1,5. 10-6/oC Dit: jarak antar rel Dij: delta l = lo. alfa. delta t = 40. 1,5.10-6.20 = 8. 1,5.10-4 = 12.10-4 celah antar rel= 12.10-4: 2x2 = 12. 10 pangkat -4 meter
2014-05-06T23:23:21+07:00
2deltaL=2(LoxalfaxdeltaT)
=2(40x0,0000015x20)
=2(0,0012)
=0,0024m.