Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Global Edition
Rotational Motion
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8-1: Angular Quantities
8-2 and 8-3: Constant Angular Acceleration; Rolling
8-4: Torque
8-5 and 8-6: Rotational Dynamics
8-7: Rotational Kinetic Energy
8-8: Angular Momentum
8-9: Angular Quantities as Vectors

Problem 19
  1. 46 rev/min246 \textrm{ rev/min}^2
  2. 46 rpm46 \textrm{ rpm}
Giancoli 7th "Global" Edition, Chapter 8, Problem 19 solution video poster

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By flsktkd on Tue, 4/25/2017 - 1:04 PM

angular position should be in radians, so it's 23*2*3.14 not 23 revolutions.

By Mr. Dychko on Fri, 4/28/2017 - 7:22 PM

Hi flsktkd, thanks for the comment. Putting angular position in radians is often the better choice, and it's the official best unit for expressing angular position, that's true. However, revolutions are still used frequently since it's a unit that people can better understand. When looking at the tachometer in a car, it shows the engine speed in revolutions per minute, for example. Since this question asks for the final angular speed in rpm, it makes sense to use revolutions throughout, although it doesn't specify units for part (a) so I suppose it would be fine to use radians per second squared there.

Best wishes,
Mr. Dychko

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