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The edge of an aluminium cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall. A mass of 100 kg is then attached to the opposite face of the cube. The shear modulus of aluminium is 25 GPa. What is the vertical deflection of this face?

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Edge length, L = 10 cm = 0.1 m

Weight attached = 100 kg

F = (100 × 9.8) N = 980 N

A = L2 = 0.1 × 0.1 m2

= 0.01 m2

= 3.92 × 10-7 m

∴ the deflection is 3.92 × 10-7 m.

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