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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80 mJ

60 mJ

40 mJ

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

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