The force (F)-extension (λ), graph shows that the strain energy stored in the material under test, for an extension of 4 mm, is greater than which of the following values?
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a
80 mJ
b
60 mJ
c
40 mJ
d
None of these
answer is C.
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Detailed Solution
Area under the curve represents strain energy stored and it is greater than 40 mJ.Area under curve (straight line)= 12.F.l= 12.(20).(4×10-3)J = 40 mJ