(II) A uniform disk turns at 3.3 rev/s around a frictionlesscentral axis. A nonrotating rod, of the same mass as the diskand length equal to the disk'sdiameter, is dropped onto thefreely spinning disk, Fig. 8–56.They then turn together aroundthe axis with their centerssuperposed. What is the angularfrequency in rev/s of thecombination?FIGURE 8-56Problem 72.

Given: Number of revolutions = 3.3 rev/s

Answered: (II) A uniform disk turns at 3.3 rev/s…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter11: Gravity, Planetary Orbits, And The Hydrogen Atom

Section: Chapter Questions

Problem 60P

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- (II) Two masses, m. nected by a rope that hangs over a pulley (as in Fig. 8–54). The pulley is a uniform cylinder of radius R = 0.311 m and mass 3.1 kg. Initially ma is on the ground and mg rests 2.5 m above the ground. If the system is released, use conservation of energy to determine the speed of mg just before it strikes the ground. Assume the pulley bearing 32.0 kg and mg = 38.0 kg, are con- R is frictionless. mB 2.5 m FIGURE 8-54 Problem 58.

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