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T₁=10⁰C T₂=80⁰C
m₁=? m₂=5kg
Cw₁=4200J/kg * C Cw₁=4200J/kg *
T₃=20⁰C
Cw₁m₁ΔT=Cw₁m₂ΔT
Cw₁m₁(T₃-T₁)=Cw₁m₂(T₂-T₃)
(Cw₁ skróci sie ze soba gdzyż oba ciala to woda)
m₁(T₃-T₁)=m₂(T₂-T₃)/:(T₃-T₁)
m₁=m₂(T₂-T₃)/(T₃-T₁)
m₁=5 x 60 / 10
m₁=300/10
m₁=30kg
(jednostki sam sobie dopiszesz)