# Is my procedure correct to compute this moment of inertia J?

1. Jul 29, 2015

### Marvin94

Looking at the image below, we have the function

$z^2=\frac{r^2}{a} y$

revolving about y-axis. We know that y goes from 0 to "a". We also know the mass of the object (of uniform density). Do you think is my procedure correct? Do you get the same result?

2. Jul 29, 2015

### Marvin94

I did wrong calculation. The results should be

(2 m r^2) / 3

without "a".

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