# Particle moving along path, change of angle of inclination

1. Jul 16, 2017

### Unicow

1. The problem statement, all variables and given/known data

2. Relevant equations
Equation given in question.

3. The attempt at a solution
The only thing I could think of was to try changing the y=3x^3 into polar coordinates but I didn't know where to go from there... Could I get some direction to how I should go about this, I'm sort of stumped as to how I should start this.

2. Jul 17, 2017

### Ray Vickson

Your "question" is unreadable. You should take the trouble to actually type it out here; many helpers would not look at posted images, even if they were readable.

3. Jul 21, 2017

### haruspex

You are given a hint to use curvature. Have you been taught any equations relating to that? See "curvature of a graph" at https://en.m.wikipedia.org/wiki/Curvature.
Or, from first principles, you know $\theta=\arctan (dy/dx)$. You could find how fast that changes as x changes and divide by how fast distance along the curve changes as x changes.

4. Jul 21, 2017

I agree.