[tex]\displaystyle Se~da:\\ \\
t_0=0^\circ\\ \\
\frac{\Delta R}{R_0}=10\%=0,1\\ \\
\alpha=3,9\times 10^{-3}\\ \\
t=?^\circ\\ \\ \\
Formule:\\ \\
\alpha=\frac{\Delta R}{R_0\times \Delta t}\\ \\
\alpha=\frac{0,1}{\Delta t}\\ \\
t-t_0=\frac{0,1}{\alpha}\\ \\
t=\frac{0,1}{\alpha}+t_0\\ \\ \\
Calcule:\\ \\
t=\frac{0,1}{3,9\times 10^{-3}}+0\approx 25,64^\circ
[/tex]