Find the center of mass of a rectangular material of length a and width b made up of a material of non-uniform density the density is such that when the rectangle is placed in the xy-plane, the density is given by ρ(x, y) = ρ0xy.

Which of the following statements are true for an isothermal process? check all that apply. - during an isothermal process, the work done by the gas equals the heat added to the gas. - during an isothermal process, the internal energy of the system changes. - an isothermal process is carried out at constant temperature. - an isothermal process is carried out at constant pressure. - an isothermal process is carried out at constant volume.