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Physics/How much friction force must the brake apply to the rim to bring the disk to a halt in 3.0 s?


James wrote at 2012-11-10 20:49:16
Just FYI your value for R should be 0.2m, as opposed to your entered 0.4m, in the solution. So the right answer should not be 5.85N.  


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James J. Kovalcin


I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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