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Practice question

Question

What is the reason a liquid’s terminal velocity depends on its radius when falling through a viscous medium?

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Explanation

Stokes’ law ( F = 6 π eta a v ) shows that viscous force is proportional to radius ( a ), while weight ( 4/3 π a³ rho g ) depends on a³ . At terminal velocity, these balance, making v propto a² .

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