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Uniform Circular Motion NS FL #2

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agileduck

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One of the questions on NextStepTestPrep's Full Length MCAT #2 Physical Sciences Section has got me stumped. It's about uniform circular motion, and in the explanation the formula they give doesn't make sense.

As far as I know the formula should be v=2pir^2/T, but instead they have written v=2pir/T. This, of course,
throws off the whole calculation.

If we use the first formula v= 15 m/s, which we plug into the Fc equation getting 1650 N.
However, without squaring v=3.14 m/s, giving a total of 100 N.

I have attached screenshots!

Screen Shot 2016-04-24 at 8.14.23 AM.png
Screen Shot 2016-04-24 at 8.14.30 AM.png
 

popopopop

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Circumference = 2pir. Area = 2pir^2. I think you want to use circumference to find the velocity around.
 

Wolfpack93

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Do you know if this is still covered on the MCAT? I thought I saw something in Kaplan saying it wasn't on the new MCAT
 
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