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m=1kg
E c=300kJ=300 000J
t końcowa=95 st C
cw=4200J/kg *stC
szukane:
t początkowa=?
Ec=m *cw *(tk -tp)
300 000J=1kg *4200J/kg *stC *(95-tp)
300 000J=4200J/stC *[95-tp] /:4200
95-tp=71,4 st C /-95
-tp=-23,6 stC /*(-1)
tp=23,6 st C