$3-$ Given: $H=12ft,=120$ pcf$,c^{\text{'}}=0$ and ${}^{\text{'}}=30$ deg., $=85$ deg., $=10$ deg., and $=20$ deg. Calculate Coulomb active lateral force per unit length of the wall, and its location and direction.

$4-$ Given: $H=12ft,=120$ pcf$,c^{\text{'}}=0$ and ${}^{\text{'}}=30$ deg., $=85$ deg., $=10$ deg., $=20$ deg., $k_h=0\mathrm{.}20,k_v=0.$ Calculate earthquake active lateral force per unit length of the wall.

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