Jawabanmu

2014-04-09T22:49:06+07:00
Q= m c ▲T Q= 0,25 . 400 . (70-40) Q = 100 . 30 = 300 joule
2014-04-10T00:27:05+07:00
Kalor yang diperlukan (Q)
Q=mcΔT
Q=0,25.400.(70-40)
Q=3000 Joule