# Centripetal force

Brittykitty
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!

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

Brittykitty
M=fc/r?

Homework Helper
M=fc/r?

what happened to the v2?

Brittykitty
Im not sure :(

FC=MV^2 / R

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

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?

Brittykitty
I really have no idea :\

Homework Helper
I really have no idea :\

If ab=c, what is b equal to ?

Brittykitty
not too sure..

Homework Helper
not too sure..

Do you know how rearrange equations to make one variable the subject of the formula?

Brittykitty
Would it be

m = fc(r)/v^2

answer 1.1 x 103 kg ?

Homework Helper
That should be correct.

Brittykitty
That you so much! :):)