For problems $2\mathrm{.}1-2\mathrm{.}5,$ determine the cracking moments for the sections shown if f$\text{'}$c $=4000$ psi and fr $=7\mathrm{.}5\backslash$lambda sqrt$($f$\text{'}$c$),$ normal weight concrete, $\backslash$lambda $=1\mathrm{.}0$ Problem $\backslash (2\mathrm{.}4$Problem $2\mathrm{.}4\backslash )$