A cylindrical heater $(1-$cm$-$diameter, and $100-$m$-$long$)$ produces heat uniformly at a constant rate of $2{10}^4\frac{W}{m^3}.$ The surface of this heater is exposed to moving air at $35C$ blowing across at a rate of $12\frac{m}{s}.$ Determine

the surface temperature of this heater.