Question

Intr-un calorimetru se pun 3kg de apa la 20 grade C si 8kg de apa 70 grade C. Care este temperatura de echilibru?

Answer 1

Q1=-Q2
c1*m1*dt1=-c2*m2*dt2, unde c1=c2
m1*dt1=-m2*dt2
m1*(t-t1)=-m2*(t-t2)
m1*t-m1*t1=-m2*t+m2*t2
m1*t+m2*t=m1*t1+m2*t2
t*(m1+m2)=m1*t1+m2*t2
t=(m1*t1+m2*t2)/(m1+m2)

t=(3*20+8*70)/(3+8)=56,(36)°C