Jawabanmu

2014-04-23T13:58:58+07:00
Q= m.c. delta t
  = 6 x 4600 x 100-20
   = 27960 x 80
   = 2236800 j
   = 2236, 8 kj

ket : 6 = massa besi + air
       4600 = kalor jenis air + besi