# Homework Help: Revolution of a curve along a axis

1. Oct 22, 2009

### kazthehack

1. The problem statement, all variables and given/known data
given z =y3 revolved around the y axis what is the equation of the surface and then graph.

2. Relevant equations

3. The attempt at a solution
I have no idea how to approach this, i tried searching around the net but nothing came out. pls help.

2. Oct 22, 2009

### lanedance

start with the equation of a circle of radius z = y^3, with centre on the y axis & in a plane perpindicular to the y axis

3. Oct 22, 2009

### kazthehack

^ what i need is a step by step solution and i learn to solve other problems if i see how it is done.

4. Oct 22, 2009

### lanedance

sorry, you have to try - i'm happy to walk you through it if you attempt, but I'm not just going to do it all for you

5. Oct 26, 2009

### tiny-tim

Hi kazthehack!

Start with a single point z =y03 (for a fixed value y0) revolved around the y axis …

what is the equation of that?

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