A mass of 11.0 kg is suspended from a rigid support by an aluminium wire of length 2.0m, diameter 2.0 mm and Young’s modulus 7.0 x 1011 Nm-2.  Determine the extension produced.  [ g = 10ms-2;  = 3.142]
This question was well attempted by most candidates however, some could not handle the arithmetic successfully.  Evaluation of the cross-sectional area where some conversion such as mm to m, mm2 to m2 are necessary posed difficulty for some candidates.