Calculation of mass in 2D
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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Thanks!!! :) 
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