May $2013$

b$.$ If shear stress along a plane is $3\mathrm{.}469{10}^{-11}Pa$ cohesion between the two sides of the discontinuity is $1\mathrm{.}2{10}^{-11}Pa,$ stress acting normal to the plane of discontinuity is $0\mathrm{.}25x{10}^{-6}Pa,$ and water pressure in the discontinuity is $2\mathrm{.}31{10}^{-8}Pa.$ Find out the angle of Frictional resistance $({}_s)$ attributed to the plane of movement.

c$.$ With proper sketch state the different forces acting on a slope.

$[2]$