Angle due to angular acceleration

[notsam]

Homework Statement

A curve of radius 54.7 m is banked so that
a car of mass 2.4 Mg traveling with uniform
speed 51 km/hr can round the curve without
relying on friction to keep it from slipping on
the surface.At what angle is the curve banked? The
acceleration due to gravity is 9.8 m/s2 .
Answer in units of degrees.

Homework Equations

a=v^2/r, tan(theta)=o/a, f=ma, f=mv^2/r

The Attempt at a Solution

Ok so here's what I think. The basic equation should look something like this. ma=mv^2/r except its at an angle so. Maybe tan(theta)ma=mv^2/r?

 

[tiny-tim]

hi notsam!

(try using the X² icon just above the Reply box )

Ok so here's what I think. The basic equation should look something like this. ma=mv^2/r except its at an angle so. Maybe tan(theta)ma=mv^2/r?

come off it!

to pass the exams, you need to give a proper explanation …

now which direction do you think you should be taking components in (and why)?