Question

Caldura degajata de 1 kg de benzina prin ardere completa este folosita pentru incalzirea a 200 kg de apa aflate initial la temperatura de 0*C. Care este temperatura finala a apei?

Answer 1

[tex]\tt Se~da:\\ \\ m_{b}=1kg\\ \\ m_{a}=200kg\\ \\ t_{1}=0^\circ C\\ \\ c=4185\frac J{kg\times^\circ C}\\ \\ q=47,3\times 10^6\frac J{kg}\\ \\ t_{2}=?^\circ C\\ \\ \\ Formule:\\ \\ Q_{primit}=Q_{cedat}\\ \\ c\times m_{a} \times \Delta t=q \times m_{b}\\ \\ c\times m_{a} \times (t_{2}-t_{1})=q \times m_{b}\\ \\ t_{2}-t_{1}=\frac{q \times m_{b}}{c\times m_{a}}\\ \\ t_{2}=\frac{q \times m_{b}}{c\times m_{a}}+t_{1}\\ \\ \\ Calcule:\\ \\ t_{2}=\frac{47,3\times 10^6 \times 1}{4185\times 200}+0\approx 56,5^\circ C[/tex]