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Please help with practice problem. Modulus of elasticity A 300 kg rock puts on an one-meter long aluminium column (E = 7 x 1010 N/m?)

Please help with practice problem.
Modulus of elasticity A 300 kg rock puts on an one-meter long aluminium column (E = 7 x 1010 N/m?) with radius 20 cm. (show in figure) Grock 1 AL Lo (a) Calculate the compressive strain of the column if a displacement of 10mm occurred. (b) What is the compressive force, Grock applied to the column

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