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Q7. A steel bar is 1.1 m long and 60 mm diameter. An axial hole 38 mm diameter is to be drilled from one end to such a depth that the extension of the drilled part is twice the extension of the solid part when an axial tensile force is applied. Calculate EACH of the following:

(a) The required depth of the drilled hole;

(b) The strain energy in the bar when an axial tensile load of 20 kN is applied.

Note: Modulus of Elasticity for steel = 210 GN/m²