Question: A retaining wall is designed to hold back a soil with a unit weight of 120 lb/ft^3. The wall has a height of 20 ft

A retaining wall is designed to hold back a soil with a unit weight of 120 lb/ft^3. The wall has a height of 20 ft and a horizontal distance of 30 ft between the top of the wall and the highest point of the soil surface. The angle of internal friction of the soil is 30 degrees, and the cohesion of the soil is 200 lb/ft^2. Assuming the soil is in a drained condition, what is the minimum factor of safety against sliding for the retaining wall?

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