Problem 523 | Friction
Problem 523
A force of 400 lb is applied to the pulley shown in Fig. P-523. The pulley is prevented from rotating by a force P applied to the end of the brake lever. If the coefficient of friction at the brake surface is 0.20, determine the value of P.
![Lever and pulley system to form a brake](http://www.mathalino.com/sites/default/files/images/523-pulley-and-lever.gif)
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