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Q.

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

60 mJ

b

40 mJ

c

80 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)

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= 12.F.l

= 12.(20).(4×10-3)J = 40 mJ

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