The space between two flat plates is filled with oil .Each plate has 60cm x 40 cm x 10 cm) and the oil film thickness is 1 mm. When the plate are inclined 60° to the horizontal as shown in fig.(1). Find the velocity of the upper plate? The relative density of the upper plate is 50 and the angular deformation of fluid is 500 1/s.

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.