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9000 Joule=4kg×L
L=9000 J/4kg
L=2250J/kg
D
8.Q=m.c.Δt
16800J=m×2100J/kg'C×4'C
16800J=m×8400J/kg
m=16800J/8400J/kg
m=2kg
A.Q=m×c×Δt
Q=2kg×4200J/kg'C×50'
Q=420000J⇒420kJ
B