Stokes law is applicable if body has __________shape?
Correct answer: D. Spherical
- A. Rough
- B. Square
- C. Circular
- D. Spherical
Explanation
Stokes' law applies to a small spherical body moving slowly through a viscous fluid, where the drag force is F = 6π η r v. The likely mistake is choosing circular, because a circle is a two-dimensional shape whereas the body must be spherical.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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