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Calculation of mass in 2D

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Old   May 24, 2012, 07:33
Default Calculation of mass in 2D
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Hi everyone,

I have a small issue.

I'm using DEFINE_SDOF_PROPERTIES for the motion of e two dimensional particle.

I want to assign, in that function, the mass to the particle, but, I don't know how calculate it.

I know its density (1050 km/m^3) and radius (0,01 m), but, in 2D, the particle is a circle, then, I can calculate its surface and not its volume.

So, the question is: how to obtain the mass from density in 2D?

Is there anyone who knows the answer?

I hope I was clear.

Thanks in advance.
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Old   May 24, 2012, 07:36
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Filippo Maria Denaro
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Quote:
Originally Posted by Faby View Post
Hi everyone,

I have a small issue.

I'm using DEFINE_SDOF_PROPERTIES for the motion of e two dimensional particle.

I want to assign, in that function, the mass to the particle, but, I don't know how calculate it.

I know its density (1050 km/m^3) and radius (0,01 m), but, in 2D, the particle is a circle, then, I can calculate its surface and not its volume.

So, the question is: how to obtain the mass from density in 2D?

Is there anyone who knows the answer?

I hope I was clear.

Thanks in advance.
you must work assuming unitary lenght in the third direction... that means pi*(0.01)^2 x 1 is the equivalent volume of a cylinder of 1 m in the third direction.
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Old   May 24, 2012, 15:23
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Originally Posted by FMDenaro View Post
you must work assuming unitary lenght in the third direction... that means pi*(0.01)^2 x 1 is the equivalent volume of a cylinder of 1 m in the third direction.
You have just confirmed what I supposed!

Thanks!!!

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