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    Dangers listening to radio on phone?

    I know talking on the mobile phone has potential risks but just wondering if it's the same with listening to the radio? (Wired earphones)
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    How to convert extension to strain graph?

    Okay please bear with me here. Perhaps an example will explain this the best: Let's say the extension in graph is numbered: 20,21,22,23,24,25 Now let's say the initial length is 20 and final is 25. Strain = change in length/initial length. So to get each for strain I tried 5/20, 5/21, 5/22...
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    convert to stress strain graph?

    I Really need help with this! I have a Force v Length (mm) graph. How do I convert this to a stress and strain graph? I know Stress is Force/Area BUT how do I find the area of this? i am given the original and final diameter, original and final length as well as the force v length graph. Thanks...
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