Density of an object = its mass / its volume --> Mass = density x volume Since you have the density in (Kg / m^3), then the mass will be in Kg and the volume should be in (m^3). Convert the measures of the object from inch to meter, multiply them by each others to find the volume and then multiply the result to the density to find the mass.
9 months ago
Last edited at 12:15AM on 7/10/2013
Alright, first I'm gonna start by stating the formula for mass. It is m=d*v. Okay, now we are going to see that density, or d, is already given. Second, how to find volume? It is length*width*height and that is also given. So just plug it in. m=5kg/m*(5*4*2). After calculating that, it is m=200kg/m