PHYSICS

JAMB 2010 - Question 11

Physics 2010 JAMB Past Questions - Question 11: if a wire 30cm long is extended to 30.5cm by a force 300N. Find the strain energy of the wire.

Choose the correct answers from the options given.
if a wire 30cm long is extended to 30.5cm by a force 300N. Find the strain energy of the wire.
A:
B:
C:
D:
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Correct Answer

D

Explanation

Energy stored in a stretched wire (strain energy)
= average force x extension
= (1)/2 Fe
= (1)/2 x 300 N (30.5 - 30.0) x 10-2 m
= (300)/2 x 0.5 x 10-2 = 0.75J

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