Odpowiedź:
t1=-5°
t2=0°
t3=50°
m2=3kg
cw2=4200J/kgC
cw1=2100J/kg*C
ct=332000J/kg
Qod=cw2*m2*(t3-t2)
Qod=4200J/kgC*3kg*50°
Qod=630000J
Qpob=ct*m1+cw1*m1*(t2-t1)
Qpob=m1(ct+cw*(t2-t1))
m1=Qpob/(ct+cw*(t2-t1)
Qpob=Qod
m1=630000J/(332000J/kg+2100J/kgC*5°
m1=1,84kg