Jawabanmu

2014-03-25T23:35:06+07:00
Q = c . m . ^t = 4, 2 . 0, 4 . 40 = 67, 2 J Kalor yg dibutuhkan ( Q ) = 67, 2 J
itu caranya bagaimana jalaskan persatu satu donkk
2014-03-26T07:55:26+07:00
1 cc = 1 x 10^-4 m3
400 cc = 400 x 10^-4 m3 = 4 x 10^-2 m^3 = 0,04 m3

Q = m x c x ΔT = 0,04 x 4,2 x (70-30) = 0,168 x 40 = 6,72 J