\left. \begin{array} { l } { x = \frac{2 a}{b ^ {2} + 1} }\\ { \text{Solve for } y \text{ where} } \\ { y = \frac{\sqrt{a + x} - \sqrt{a - x}}{\sqrt{a + x} + \sqrt{a - x}} } \end{array} \right.
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A pipe of 5 cm diameter is carrying an oil of viscosity 0.8 stokes. If the Reynold’s number of oil flow is 1800, find the velocity at radius 0.6 cm from the wall.
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