# Calculation of mass in 2D

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 May 24, 2012, 06:33 Calculation of mass in 2D #1 New Member   Join Date: Apr 2012 Posts: 17 Rep Power: 6 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.

May 24, 2012, 06:36
#2
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Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,520
Rep Power: 31
Quote:
 Originally Posted by Faby 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.

May 24, 2012, 14:23
#3
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Join Date: Apr 2012
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Quote:
 Originally Posted by FMDenaro 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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