Convert 2.5gmm-2 to kgm-2​

Most short-period comets do not have randomly oriented orbits because

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

What property of an object determines its inertia?