For Problems $2\mathrm{.}1$ to $2\mathrm{.}5,$ determine the cracking moments for the sec

sections shown if $f_c^{\text{'}}=4000$ psi and $f_r=7\mathrm{.}5\sqrt[\phantom{2}]{f_c^{\text{'}}},$ normal$-$weight concrete, $=1\mathrm{.}0.$