Forces acting on a particle settling in fluid are _____________ forces?
Correct answer: C. Gravitational or centrifugal buoyant drag
- A. Gravitational & buoyant
- B. Centrifugal & drag
- C. Gravitational or centrifugal buoyant drag
- D. External, drag & viscous
Explanation
A settling particle is acted on by its weight, buoyancy, and fluid drag; in centrifugal settling, the gravitational force is replaced or supplemented by centrifugal force. Option c is intended to list these forces, although its wording is poorly formatted.
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