c) A slightly moist sand sample is subjected to a normal force σ′=25KN in a direct shear test like the one shown below (

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c) A slightly moist sand sample is subjected to a normal force σ′=25KN in a direct shear test like the one shown below (Figure 1). If the strength parameters of the sand are c= 1KPa and φ=28∘, calculate the shear stress at failure if the soil sample is 12 cm×12 cm in plane and 3 cm in height. (5 marks) Figure 1: Diagram showing a direct shear box test