a$)$

Three direct shear tests have been performed on a soil sample. What is the cohesion in psf$?$

$\backslash$table$[[{}_1=1700p,{}_1=1230,$ot$],[o_2=270,{}_2=1500,$out$],[{}_3=1370,{}_3=2000,$ost$],[,,],[,,\backslash$table$[[,,],[,,\backslash$table$[[,,],[,,],[,,],[,,],[,,],[,,]]]]]]$

b$)$

A clay soil subjected to an unconfined compression test fails at a pressure of $3000$ psf$.$ What is the shear strength of this soil in psf$?$

c$)$

A direct shear test was performed on a clean sand sample. Internal friction angle was found to be $38$ degrees. What is the cohesion in psf$?$