Calculation of mass in 2D
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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