Atmospheric air is in parallel flow (left(u_{infty}=10 mathrm{~m} / mathrm{s}, T_{infty}= ight.) (15^{circ} mathrm{C}) ) over a

Atmospheric air is in parallel flow \(\left(u_{\infty}=10 \mathrm{~m} / \mathrm{s}, T_{\infty}=\right.\) \(15^{\circ} \mathrm{C}\) ) over a flat heater surface that is to be maintained at a temperature of \(90^{\circ} \mathrm{C}\). The heater surface area is \(0.25 \mathrm{~m}^{2}\), and the airflow is known to induce a drag force of \(0.15 \mathrm{~N}\) on the heater. What is the electrical power needed to maintain the prescribed surface temperature?