Question $1(15$ points$)$

Perform the following mass$-$to$-$weight or weight$-$to$-$mass conversions for each of the parts:

Convert a total mass density $($r$)$ of $2000$ kg$/$m$3$ to a unit weight.

Find the unit weight of solids, knowing that the specific gravity of the solid is $2\mathrm{.}70.$

Express the results in SI units $($kN$/$m$3)$

Find the unit weight of solids, knowing that the specific gravity of the solid is $2\mathrm{.}72.$

Express the results in English units $($lbs$/$ft$3)$