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## Homework Statement

Can i use "pyramid" method to derive the equation of Moment Inertia solid sphere?

The pyramid is such we slice a watermelon.

Sorry for my bad english.

Regards.

## Homework Equations

2/5 MR^2

- Thread starter chocophysuny
- Start date

- #1

- 3

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Can i use "pyramid" method to derive the equation of Moment Inertia solid sphere?

The pyramid is such we slice a watermelon.

Sorry for my bad english.

Regards.

2/5 MR^2

- #2

- 266

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Welcome to Physics Forums,

Can i use "pyramid" method to derive the equation of Moment Inertia solid sphere?

Have you tried it? You must show what you have tried to get help on PF (forum rules).

Sunil

- #3

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- #4

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But my lecture say this method is easy enough to solve.

And, actually i confused to find the element of volume and element of MI.

So, in your opinion, this is not solvable?

- #5

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Yes, I've tried it. But i didn't find the solution.Hello chocophysuny,

Welcome to Physics Forums,

Have you tried it? You must show what you have tried to get help on PF (forum rules).

Sunil

I'm confused with the element of volume and element of pyramid

"To find MI from the element, we need element of volume and element of MI, isn't it?"

- #6

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I'm sorry, I didn't understand what you meant there."To find MI from the element, we need element of volume and element of MI, isn't it?"

- #7

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Maybe I misunderstand the proposed method. From your watermelon analogy, I assumed it involves slicing the sphere into thin wedges using planes through the axis of rotation. If so, I think you would then need to cut each wedge into laminae, either rectangular ones parallel to the axis or triangular ones orthogonal to the axis.But my lecture say this method is easy enough to solve.

And, actually i confused to find the element of volume and element of MI.

So, in your opinion, this is not solvable?

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