Solve Problem $11-4$ on p$.227$ of the text, or see below:

$11-4.$ What is the total active earth pressure per foot of wall for the wall shown in Figure $11-39,$ using Rankine theory?

FIGURE $11-39$

Solve Problem $11-7$ on p$.228$ of the text, or see below:

$11-7.$ What is the total active earth pressure per foot of wall for the retaining wall in Problem $11-4,$ with an angle of wall friction between backfill and wall of $25,$ using Coulomb theory?

Solve Problem $11-11$ on p$.228$ of the text, or see below:

$11-11.$ A braced sheet pile to be used in an open cut i sand is shown in Figure $11-40.$ Assume that th sheet piles are hinged at strut levels $B$ and $C.$ Stru are spaced longitudinally at $2\mathrm{.}5-m$ center$-$to$-$cent spacing. Draw the lateral earth pressure diagram $fc$ the braced sheet pile system and compute the loas on struts $A,B,C,$ and $D.$