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If a thin plate is held parallel to fluid stream the pressure drag on it is:

If a thin plate is held parallel to fluid stream the pressure drag on it is: Correct Answer Zero

Explanation:

Viscous forces and pressure forces are responsible for drag forces. There are two types of drag forces present pressure drag and skin friction drag. Pressure drag is due to the wake region behind the body and skin friction drag is due to the viscosity of the fluid.

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In case of flow over a thin plate placed parallel to a stream of flowing fluid, the flow separation (if occurs), would occur only towards the rear end and the wake is negligibly small. The resulting pressure drag will also be very small, approximate to zero.

On the other hand, pressure drag will be large when the thin plate is held perpendicular to the flow.

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