bmkendzior3598 bmkendzior3598 29-03-2024 Health contestada Direct shear test data of a sand are shown below: Area of sample = 20 in² Normal load at failure = 800 lb Shear stress at failure = 20 psi The angle of internal friction is most nearly: a) 30 degrees b) 35 degrees c) 40 degrees d) 45 degrees