Air at \(25^{\circ} \mathrm{C}\) flows normal to the axis of an infinitely long cylinder of \(1.0-\mathrm{m}\) radius. The approach velocity is \(100 \mathrm{~km} / \mathrm{hr}\). Find the rotational velocity of the cylinder so that a single stagnation point occurs on the lower-most part of the cylinder. Assume potential flow.