Centripetal force

  • #1
Brittykitty
81
0
A 2.4 x 103 N force is necessary to keep a car and driver moving at a speed of 100 km/h through the middle of a highway curve that has a radius of 350 m. What is the mass of the car and driver?

Im really confused on this question, I was told the formula should be something like

FC=MV^2 / R

but how can I find the mass.

Help!
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,223
31
Yes that formula is correct, can you arrange it so that M alone is on one side of the equation?
 
  • #3
Brittykitty
81
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M=fc/r?
 
  • #5
Brittykitty
81
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Im not sure :(

FC=MV^2 / R

M=(FC)(V^2)/R?
 
  • #6
rock.freak667
Homework Helper
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Im not sure :(

FC=MV^2 / R

M=(FC)(V^2)/R?


From Fc=mv2/r

if you multiply both sides by r and then divide by sides by v2, what do you get?
 
  • #7
Brittykitty
81
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I really have no idea :\
 
  • #9
Brittykitty
81
0
not too sure..
 
  • #10
rock.freak667
Homework Helper
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not too sure..

Do you know how rearrange equations to make one variable the subject of the formula?
 
  • #11
Brittykitty
81
0
Would it be

m = fc(r)/v^2

answer 1.1 x 103 kg ?
 
  • #12
rock.freak667
Homework Helper
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That should be correct.
 
  • #13
Brittykitty
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That you so much! :):)
 

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