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- One of the applications of Stoke's law is to calculate terminal velocity of a sphere in a quiescent fluid. Let us consider a sphere falling under gravity in stagnant fluid :
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(Fig. 26a) |
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| There are 3 forcess acting on the sphere |
- Gravity
- Buoyancy
- drag (viscous) forces
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| Therefore, |
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When the particle acquires a steady-velocity or it reaches a constant (terminal) velocity |
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 Therefore,
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