in an experiment to find the young modulus , the strain should not be more than 1 in 1000 , explain this statement
1
Expert's answer
2012-04-10T07:05:57-0400
Young's modulus is a ratio for metal - metal wire, metal rod, metal beam etc. Y = stress/strain {in the ELASTIC region of materials ie metals}
Strain = (Lf - Lo)/Lo,
where Lf is final length and Lo is initial length. If strain < 0.001 then (Lf - Lo)/Lo < 0.001
and from that
Lf - Lo < 0.001(Lo).
Keeping the "change in length" below 0.1% is necessary to prevent the "elastic limit" of the metal from being exceeded. IF a metal's elastic limit is exceeded "Young's modulus" no longer = stress/strain so any experiment to find its value that went beyond the elastic range would be void.
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