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Find the distance by which a 43cm diameter, 8.7m tall concrete column is compressed when it supports a 12400kg load

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    Young's modulus E is defined as:
    E = stress/strain = (F/A) / (ΔL/L)
    Young's modulus for condrete is E =20-100 Gpa.
    ΔL=F•L/A•E=4•m•g•L/π•D²•E,

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