Find the minimum force required to drag a hard polythene plate of area `2 m^(2)` on a thin film of oil of thickness `0.25 cm` and `eta= 15` poise. Assume the speed of the plate is `10 cm s^(-1)`.

Explanation

To find the minimum force required to drag a hard polythene plate on a thin film of oil, we can use the formula for viscous force:

\[ F = \mu \cdot A \cdot \frac{v}{h} \]

where:
- \( F \) is the force,
- \( \mu \) is the viscosity of the fluid,
- \( A \) is the area of the plate,
...