Question

12 va rooog! Dau coroanaaaa!

Answer 1

[tex]\displaystyle Se~da:\\ \\ \rho_0=7,8\frac{g}{cm^3}=7800\frac {kg}{m^3}\\ \\ V_0=1dm^3=0,001m^3\\ \\ t_0=0^\circ\\ \\ t=200^\circ\\ \\ \rho=7,790\frac g{cm^3}=7790\frac {kg}{m^3}\\ \\ \Delta V=?m^3\\ \\ \\[/tex]


[tex]\displaystyle Formule:\\ \\ \alpha=\frac{\Delta V}{V_0\times \Delta t}\\ \\ \Delta V=V_0\times \alpha\times \Delta t\\ \\ \\ \alpha=\frac{\Delta\rho}{\rho_0\times \Delta t}\\ \\ \alpha=\frac{\rho_0-\rho}{\rho_0\times \Delta t}\\ \\ \alpha\times\Delta t=\frac{\rho_0-\rho}{\rho_0}\\ \\ \\ \Delta V=V_0\times \frac{\rho_0-\rho}{\rho_0}\\ \\ \\ Calcule:\\ \\ \Delta V=0,001\times \frac{7800-7790}{7800}=1,28\times 10^{-6}m^3[/tex]