The two square cross sections shown below $($Figure $1)$ are each subjected to a vertical shear force, $V.$ The side length of each cross section is $s=7\mathrm{.}00$

in and the side length of the hollowed$-$out portion of the second cross section is $r=2\mathrm{.}50in.$ The maximum allowable shear stress in each member is

${}_{\text{m}\text{a}\text{x}}=20\mathrm{.}0$ksi.

Express your answer to three significant figures and include appropriate units.

Part B $-$ Moment of the area $A^{\text{'}}$ about the neutral axis of the hollow square shaft

Express your answer to three significant figures and include appropriate units.

Part C $-$ Maximum applicable shear force on the solid square shaft

Determine the maximum applicable shear force on the solid square shaft, $V_{\text{m}\text{a}\text{x}}$

Express your answer to three significant figures and include appropriate units.

$\{\begin{array}{ccc}\text{:}{V}_{\text{m}\text{a}\text{x}}=++& & ?\end{array}$

Part D $-$ Maximum applicable shear force on the hollow square shaft

Determine the maximum applicable shear force on the hollow square shaft, $V_{\text{m}\text{a}\text{x}}.$

Express your answer to three significant figures and include appropriate units.

$V_{\text{m}\text{a}\text{x}}=+0?$