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A rock sample is placed in a strength-testing machine at atmospheric pressure and is compressed axially...

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Physics

A rock sample is placed in a strength-testing machine atatmospheric pressure and is compressed axially to failure. A forceof 12,000 Ibf was required for rock failure, and the cross-sectional area of the sample were 2.0 sq in. The sample failedalong a plane that marks a 35 angle with the direction ofcompressional loading A) Construct the Mohr's circle using the twoprincipal stresses present B) Compute the shear stress presentalong the plane of failure C) Compute the normal stress to theplane of failure. D) Compute the angle of internal friction. E)Compute the cohesive resistance of the material. F)Label theparameters computed in the previous four steps on the Mohr's circleconstruction. Using the Mohr criterion, compute the compressionalforce required for rock failure if the sample is placed under a5,000-psi confining pressure.

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