Q. 7

Two persons pull a rope towards themselves. Each person exerts a force of 100 N on the rope. Find the Young modulus of the material of the rope if it extends in length by 1 cm. Original length of the rope = 2 m and the area of cross section = 2 cm2.

Answer :

1 × 108 N m-2

Given, Force,


Cross-sectional area of rope,


Length of rope,


Extension is rope,


We know, stress,


And strain is given by ,


Young’s modulus then becomes,



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HC Verma - Concepts of Physics Part 1