Ok I have the answer:
Formula:
W = ½ force x extension
Answer:
W = ½ × 60 N × 2.81×10-3m = 8.43×10-2J or 84 mJ
One last question and its why it took me so long to work it out. Why is the strain of 0.0025 mentioned when it does not seem to be relevant when working out this answer.
A steel wire diameter 0.50mm and length 1.84m is suspended vertically from a fixed point and used to support a 60N weight hung from the lower end of the wire. The Young modulus for steel is 2.0 x 10^11 N m-2
a) The extension of the wire
b) The elastic energy stored in a wire given the...