Two fixed, horizontal, parallel plates are spaced 0.4 in. apart. A viscous liquid (left(mu=8 times 10^{-3} mathrm{lb} cdot mathrm{s} / mathrm{ft}^{2}, S G=0.9 ight)) flows

Two fixed, horizontal, parallel plates are spaced 0.4 in. apart. A viscous liquid \(\left(\mu=8 \times 10^{-3} \mathrm{lb} \cdot \mathrm{s} / \mathrm{ft}^{2}, S G=0.9\right)\) flows between the plates with a mean velocity of \(0.5 \mathrm{ft} / \mathrm{s}\). The flow is laminar. Determine the pressure drop per unit length in the direction of flow. What is the maximum velocity in the channel?