4. Tables of materials properties list density, in units of kg/m3, when the interna- tional system of units (ST) is used and list specific weight, in units of lb/in" when the U.S. customary system of units are used. Write a user-defined MAT LAB function that converts density to specific weight. For the function name and arguments, use [sw] = DenToSw (den). The input argument den is the density of a material in kg/m3, and the output argument sw is the specific weight in lb/m3. Use the function in the Command Window to: sw-den / 2-0 (a) Determine the specific weight of steel whose density is 7860 kg/m3 (b) Determine the specific weight of titanium whose density is 4730 kg/m3