Refer to Figure 15.53. Using the ordinary method of slices, find the factor of safety with respect

Question:

Refer to Figure 15.53. Using the ordinary method of slices, find the factor of safety with respect to sliding for the following trial cases:
a. H = 15.2m, ( = 45o, ( = 30o, ( = 70°, ( = 18.9 kN/m3,
( = 18°, and c' = 31 kN/m2
b. H = 8 m, ( = 45o, ( = 30o, ( = 80o, ( = 17 kN/m3,
(' = 20o, and c' = 27/m2