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An iron wire of 10 m long with a cross section area of 2.0 mm2 is...

  1. An iron wire of 10 m long with a cross section area of 2.0 mm2 is used to support a 400-kg load.  Its elongation is (in mm)    (a) 1.5   (b) 9.8    ( c) 15.8  (d) 37.9  ΔL/Lo =(F/A)/Y
  2. A wire 10 m long with a cross section area of 3 mm2 stretches by 12 mm when a 500-kg mass was suspended from it.  The Young’s modulus for this wire  is (in Pa)   (a) 1.5   (b) 9.8     ( c) 15.8     (d) 37.9                                        Y = (F/A)/(ΔL/Lo)
  3. When a pressure of 3 MPa is applied to a liquid, it contracts by 0.06%.  The bulk modulus of the liquid is (in MPa) (a) 50   (b) 300   (c) 600  (d) 5000     B = (F/A)/(ΔV/Vo)
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