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i=5A
v=240volt
m=100kg
C=4200 J/Kg°c
∆t=60-40=20°c
ditanya:
t=?
jwb:
Q = W
m.C.∆t = V.i.t
100×4200×20 = 240×5×t
8400000 = 1200×t
t = 84000/12
t = 7000 secon
maaf klw salah..