Question

Ce volum de gliceria poate fi incalzit cu 25 grade celsiu trasmitindui o cantitate de caldura egala cu 37.8kj

Answer 1

$t_1=0 ^oC \\ t_2=25^oC \\ Q=37,8 \ kJ=37 \ 800 \ J \\ \rho=1 \ 260 \ kg/m^3 \\ g=2 \ 400 \ J/(kg \cdot ^oC) \\ \boxed{V-?} \\ \bold{Rezolvare:} \\ \boxed{\mahtt{\rho= \frac{m}{V}} } \\ \boxed{Q=m \cdot c \cdot \triangle l}} \\ V= \frac{m}{\rho} \\ m= \frac{Q}{c\cdot \triangle l} \\ m= \frac{37 \ 800 \ J}{2 \ 400 \ J/(kg \cdot ^oC) \cdot 25 ^oC } \\ m= 0,63 \ kg \\ \Rightarrow V= \frac{0,63 \ kg}{1 \ 260 \ kg/m^3} \\ \Rightarrow \boxed{V=0,0005 \ m^3}.$