Page 92 - CITS - WCS - Mechanical

WORKSHOP SCIENCE - CITS

5 A force of 1000 kg is applied axially on rod of 12 mm diameter the original length is 100 mm. If modulus of
elasticity is 2 x 10 kg/cm . Calculate the stress and strain developed in the rod.
2
12
6 A steel wire 3.2 mm diameter and 3.65 metre long stretches by 2.03 mm under the load of 115 kg. Calculate
the stress and young’s modulus of elasticity.
7 A mass of 10 kg is hung from a vertical wire 300.25 cm long and 0.0005 sq. cm cross section. When the load
is removed the wire is found to be 300 cm long. Find the modulus of elasticity for the wire material.
8 A steel rod of 1.5 cm diameter and 8 metres long pulled by a forced of 80
kg at both ends. Find out the expansion and strain on the rod. The coefficient of elasticity
E = 2.10×10 kg/cm .
2
6
9 A wire of length 3.5 m and diameter 0.35 mm is stretched by a force of 2kg weight. If the elongation is 4 mm.
Calculate the young’s modulus of the material of wire.
10 A mass of 1kg is suspended from a metal wire 100 cm long and 0.5 mm diameter. An increase in length of wire
equal to 2 mm is observed. Calculate the young’s modulus of wire.

11 A 4 metre long copper wire of diameter 3 mm is used to support a mass of 50kg. What will be the elongation
of the wire. Young’s modulus of elasticity for copper is 7x10 N/mm .
10
2

79

CITS : WCS - Mechanical - Exercise 7 CITS : WCS - Mechanical - Exercise 7