Calculating Force of Static Friction on a Car

[Fire Slayer]

Homework Statement

When you take your 1100-kg car out for a spin, you go around a corner of radius 55m with a speed of 15m/s. Assuming your car doesn't skid, what is the force exerted on it by static friciton?

Homework Equations

f$$_{}c$$=ma$$_{}c$$
f$$_{}c$$=mv$$^{}2$$/r
$$\sumf=ma$$

The Attempt at a Solution

$$\sum$$f=ma
f$$_{}s$$=mv$$^{}2$$/r
f$$_{}s$$=300

300=$$\mu$$$$_{}s$$mg
300=$$\mu$$$$_{}s$$(1100)(908)
$$\mu_{}s$$=0.027

but apparantley it's supposed to be 4.5
what happened?

 

[learningphysics]

How did you get 300?

And why are you calculating the coefficient of friction? The question only asks for the force.