- #1

PSOA

How do I get rid of infinitesimal mass element dm?

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- Thread starter PSOA
- Start date

- #1

PSOA

How do I get rid of infinitesimal mass element dm?

- #2

radou

Homework Helper

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How do I get rid of infinitesimal mass element dm?

I assume you're trying to derive the moment of inertia of a hollow sphere, but you should really be more specific when posting questions.

- #3

PSOA

- #4

BobG

Science Advisor

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In your case, you have a hollow sphere, so the mass will change in relation to the area (assuming the sphere has an infinitely small thickness). That would be g/cm^2, kg/m^2, etc.

That should allow you to change your variable to dr, the differential radius, since the volume and/or the area will depend upon the radius.

- #5

PSOA

But I need the constant sigma M/A (equivalent to density) which I do not know.

- #6

- 769

- 15

Maybe Integrate? I don't really understand your problem.

- #7

PSOA

I need to [tex]\int dm[/tex] for a spherical shell.

- #8

OlderDan

Science Advisor

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I need to [tex]\int dm[/tex] for a spherical shell.

Look at the thread that started this.

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