Atmospheric air is in parallel flow (left(v_{infty}=15 mathrm{~m} / mathrm{s}, T_{infty}=15^{circ} mathrm{C} ight)) over a flat heater

Atmospheric air is in parallel flow \(\left(v_{\infty}=15 \mathrm{~m} / \mathrm{s}, T_{\infty}=15^{\circ} \mathrm{C}\right)\) over a flat heater surface that is to be maintained at \(140^{\circ} \mathrm{C}\). The heater surface area is \(0.25 \mathrm{~m}^{2}\), and the airflow is known to induce a drag force of \(0.25 \mathrm{~N}\) on the heater. What is the electrical power needed to maintain the prescribed surface temperature? What is the heat transfer coefficient?