CBSE Class 11-science Answered
(i) The curves differ as regards the following points :
(a) The linear portions of the curves being smaller, Hooke's law is not obeyed even for small stress.
(b) There is no permanent strain even for large stresses.
(c) The elastic region is larger in the present curves.
(d) During unloading, the same curve is not retraced in the present case.
(ii) We should use rubber B to absorb vibrations of the machinery. It is because of larger area of the curve that greater amount of vibrational energy can be dissipated.
(iii) We should use rubber A for making car tyres. Because the work done in case rubber A is lesser (lesser area of the curve), hence the car tyres of this rubber will not get excessively heated.