Drag is defined as the force exerted by the___________________?
Correct answer: D. Fluid on the solid in the direction of flow
- A. Fluid on the solid in a direction opposite to flow
- B. None of these
- C. Solid on the fluid
- D. Fluid on the solid in the direction of flow
Explanation
For a stationary solid in a flowing fluid, drag acts on the solid in the direction of fluid flow, opposing the relative motion of the solid through the fluid. Hence it is described as fluid force on the solid in the flow direction.
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