# One question on cercular motion

1. Oct 30, 2005

### kevinlikesphysics

just need to know what to do i keep getting different answers

[SFHS99 7.P.44.] A 13750 N car traveling at 47.0 km/h rounds a curve of radius 2.60 102 m.

(a) Find the centripetal acceleration of the car.

.66 m/s sqaured

(b) Find the force that maintains centripetal acceleration.
<this is what i cant get right here is what i got please tell me what to do>

N

9014.18

9006.38

1403.06

those are the answers i got can someone please tell me the right answer and how to get it thats alot and equation would be nice i have been using

ma = ma(v^2)/R

(c) Find the minimum coefficient of static friction between the tires and the road that will allow the car to round the curve safely

.067 = coef.

thanks

2. Oct 30, 2005

### Päällikkö

The equation you're using has a typo.
It's supposed to be ma = mv2 / R (without that extra a).

a) I got a different answer (R = 102m, if I understood the numbers right?)
b) and c) Could you show what you've tried, and why?