Se da:
[tex]l=5cm=0,05m\\
t1=1000C\\
m2=0,5kg\\
t2=20C\\
p1=7800\frac{kg}{m^{3}}\\
c1=480\frac{J}{kg*C}\\
c2=4185\frac{J}{kg*C}\\
t=?C\\
Formule:\\
Q2=-Q1\\
c2*m2*dt2=-c1*m1*dt1\\
c2*m2*(t-t2)=-c1*V1*p1*(t-t1)\\
c2*m2*t-c2*m2*t2=-c1*l^{3}*p1*t+c1*l^{3}*p1*t1\\
c2*m2*t+c1*l^{3}*p1*t=c1*l^{3}*p1*t1+c2*m2*t2\\
t*(c2*m2+c1*l^{3}*p1)=c1*l^{3}*p1*t1+c2*m2*t2\\
t=\frac{c1*l^{3}*p1*t1+c2*m2*t2}{c2*m2+c1*l^{3}*p1}\\
Calcule:\\
t=\frac{480*0,05^{3}*7800*1000+4185*0,5*20}{4185*0,5+480*0,05^{3}*7800}=199C[/tex]
