The surface temperature $(T_4)$ for a sold can be calculated using the formula $$ where $T_{}$ is the ambient temperature, $f_{\text{r}\text{e}\text{s}}$ is the rate of heat generation, $h$ is the heat transfer coefficient, $V$ is the volume of the sold.

$T_1=-T_2-\frac{t_3^2}{t_3^2}$

$F_1-F_2\frac{6_2^2}{2^2}$

$T_1=T_2-\frac{t_2{r}^2}{r^2}$

$Y_1=Y_2\frac{3_2^2}{{32}^2}$

the frust cotion

the second extion

the third option

the fourth aption