How to find energy stored in a wire

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To find the energy stored in a stressed wire, start by calculating the force exerted using the weight of the wire, which is 1000 tonnes or 1,000,000 kg, multiplied by gravitational acceleration (9.8 m/s²). Next, determine the cross-sectional area of the wire using the tensile strength (1000 MPa) and the stress formula (σ = P/A). The volume can be found by dividing the weight by the density of high tensile steel. It's important to note that while the wire stretches, its weight remains constant, but its dimensions change. The discussion emphasizes the need for clarity on the equations and properties of the material involved.
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There are 1000 tonnes of high tensile steel wire stressed to 1000MPa. How much energy is stored in the steel?



\sigma = P/A



First I multiplied the 1000 tonnes (1000000kg) by 9.8m/s^2. Then I found the volume by dividing the weight by the original weight. I don't know what to do next. I am not even sure if i am going in the right direction or which equation i should use. Any help is appreciated.
 
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If something streaches, its weight does not change. It gets thinner but longer. Hint: Find the volume by using metal properties.
 

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