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m=2,5kg
t1=18 stC
t2=100 stC
cw=4200J/kg *stC
szukane:
Q=?
Q=m *cw *(t2-t1)
Q= 2,5kg *4200J/kg *stC (100 stC-18 stC)
Q=10500 *82 J
Q=861000J=861kJ