Answer
$\frac{ Wv^2}{Fg}, \ \ 1900$
Work Step by Step
To solve the given equation for $r$, we divide both sides by $Fg$ as follows
$$
Fgr = Wv^2 \Longrightarrow r=\frac{ Wv^2}{Fg}
.$$
Now, by substitution, we have
$$
r=\frac{ Wv^2}{Fg}=\frac{ (24,000)176^2}{(12,000)(32)}=1936\approx 1900
.$$
