_ Forces acting on a particle settling in fluid are __________ forces.

1.	_ Forces acting on a particle settling in fluid are __________ forces.$?
A.	Gravitational & buoyant
B.	Centrifugal & drag
C.	Gravitational or centrifugal buoyant drag
D.	External, drag & viscous
Answer» D. External, drag & viscous

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_ Forces acting on a particle settling in fluid are __________ forces.$?

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