alleryStart learning →A rider circles inside a cylindrical well of radius r with friction coefficient μ. Minimum speed to stay up is
A√(μrg)
B√(rg)
C√(rg/μ)
D√(μ/rg)
Answer & Solution
Correct answer: C. √(rg/μ)
Setting mg = μN with N = mv²/r gives v(min) = √(rg/μ).
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