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Uniform Circular Motion Question

  • #1
1. Homework Statement :
A body of mass 81.7g is moving in a circular path of radius 0.65m. If we calculate the centrifugal force on it to have a magnitude of 0.35N, what is the period of revolution? (2 decimals, UNITS!)(p = 3.14)


2. Homework Equations :
I'm given the following equations:
a = v^2/r
v = Circumference/Period = 2pi/T
a = 4pi^2r/T^2
F = Mg
F = ma
3. The Attempt at a Solution :
I took .35 = mv^2/r so .35 = 81.7v^2/.65 so v = .5276
then I took T = 2pir/v so T = 2pi(.65)/.5276 so T =7.736

I got this wrong when I entered it. I may have rounded wrong at the end or didn't do it right in the first place Any help would be appreciated.
 

Answers and Replies

  • #2
andrevdh
Homework Helper
2,128
116
The supplied mass is in grams.
 
  • #3
so I would divide the mass by 1000 then do what i did?
 
  • #4
Kurdt
Staff Emeritus
Science Advisor
Gold Member
4,812
6
Seems that way. Always take note of the units in questions and remember that standard formula are for SI units.
 
  • #5
andrevdh
Homework Helper
2,128
116
Yes. The S.I. unit of mass is kilograms.
 

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