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Statement of a problem № 2573

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As shown in Fig. 9-7, a cylindrical shell of inner radius r rotates at angular speed w. A wooden block rests against the inner surface and rotates with it. If the coefficient of static friction between block and surface is Ns, how fast must the shell be rotating if the block is not to slip and fall? Assume r = 150 cm and Ns=0.30.

Solution:
As shown in Fig. 9-7, a cylindrical shell of inner radius r rotates at angular s

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