Given:

$\begin{aligned} μ &=14 poise=1.4 Ns/m^2 \text{(Dynamic viscosity of oil)} \quad \text{(Since 10 poise}=1 Ns/m^2) \\ v&=2.5 m/s \text{(velocity of the top plate)} \\ h&=1.25 cm \text{(distance between the two plates)} \end{aligned}$

To find:

$\tau \text{(Shear stress in the oil)}$

Sol:

Now, we know by Newton’s law of viscosity for …