Problem $9\mathrm{.}9$

$9\mathrm{.}10$ If the soil pressure under the footing of Problem $9\mathrm{.}9$ were limited to $2\mathrm{.}5ksf,$ what would be the new required dimensions for the square footing? $($Use $2-$in$.$ increments.$)$

$9\mathrm{.}11$ A hopper weighing $75kN$ is supported by three $19-$mm$-$diameter steel rods. Calculate the tensile stress developed in the rods, assuming that the rods support equal loads.

$9\mathrm{.}12$ A steel bar has a rectangular cross section $25mm$ by $100mm$ and an allowable tensile stress of $140$MPa. Calculate the allowable axial tensile load that may be applied.

maximum load $P$ that could be supported at the lower end of the wire. Allowable tensile stress is $24,000$ psi.

and two in the web. $($Neglect stress concentration.$)$just $9\mathrm{.}9$ and $9\mathrm{.}12$