---
title: "A person’s back is against the inner wall of spinning cylinder with no support under their feet. If the radius is R, find an expression for the minimum angular speed so the person does not slide down the wall. The coefficient of static friction is µs."
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url: "https://nerd-notes.com/ubq/21023/"
date_modified: "2025-09-23T04:51:46+00:00"
---

# A person’s back is against the inner wall of spinning cylinder with no support under their feet. If the radius is R, find an expression for the minimum angular speed so the person does not slide down the wall. The coefficient of static friction is µs.

A person’s back is against the inner wall of a spinning cylinder with no support under their feet. If the radius is \(R\), find an expression for the minimum angular speed so the person does not slide down the wall. The coefficient of static friction is \(\mu_s\).

If you haven’t studied angular velocity \(\omega\) yet, just find the minumum linear velocity \(v\).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/21023/*