Question: A dry sand sample in triaxial test failed when the confining stress ( minor principle stress ) was 1 , 0 0 0 psf and

A dry sand sample in triaxial test failed when the confining stress (minor principle stress) was 1,000 psf and the axial stress (major principle stress) was 4,000 psf. What is the angle of internal friction for this soil? Please show graphically the top half of the Mohrs circle and the tangent failure plane.

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