If a wire 30 cm long is extended to 30 5 cm by ... - JAMB Physics 2010 Question
If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire
A
0.75 J
B
7.50 J
C
75.00 J
D
750.00 J
correct option: a
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
= 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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