# Centripetal force

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!

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rock.freak667
Homework Helper
Yes that formula is correct, can you arrange it so that M alone is on one side of the equation?

M=fc/r?

rock.freak667
Homework Helper
M=fc/r?
what happened to the v2?

Im not sure :(

FC=MV^2 / R

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

rock.freak667
Homework Helper
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?

I really have no idea :\

rock.freak667
Homework Helper
I really have no idea :\
If ab=c, what is b equal to ?

not too sure..

rock.freak667
Homework Helper
not too sure..
Do you know how rearrange equations to make one variable the subject of the formula?

Would it be

m = fc(r)/v^2

answer 1.1 x 103 kg ?

rock.freak667
Homework Helper
That should be correct.

That you so much! :):)