Question

an iron bar of length L cross section A and young's modulus y is heated from 0 degree Celsius to 100 degree Celsius if this bar is held so that it is not permitted to bend and to expand the force f that is developed proportional to ​

Answer 1

Answer:

A steel wire of uniform cross section of 1 sq mm is heated to 70

o

C and stretched by tying it two ends rigidly. Calculate the change in tension on the wire when temperature falls from 70

o

C to 35

o

C.

(Co-efficient of linear expansion of steel =1.1×10

−5

 C

−1

and Young's modulus is 2.0×10

11

Pa.)

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