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Two parallel and opposite forces, each of magnitude `4000 N`, are applied tangentially to the upper and lower faces of a cubical metal block `25 cm` on a side. Find the angle of shear and the displacement of the upper surface relative to the lower surface. The shear modulus for the metal is `80 GPa`.

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The correct Answer is:
`8.0xx10^(-7) rad ,2.0xx10^(-7)m`
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