Recent content by sc298

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    Comparing Stress in Pipes with High Pressure Fluid Inside and Outside

    Two situations: * A pipe with high pressure fluid inside - stress determined by hoop stress. * A pipe with high pressure fluid outside Suppose the pressure differences are the same in each situation, which would have less stress? Or are they equal? My first thoughts are that if the...
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    Joule's Mechanical Equivalent of Heat

    Can I take Joule's Mechanical Equivalent of Heat, J, as just unity when using SI considering it is just a conversion factor?
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    Joule's Mechanical Equivalent of Heat

    So if working in SI units I can just assume J to be unity?
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    Joule's Mechanical Equivalent of Heat

    As I understand it, J's MEoH is the calorific value of a substance. The standard value for this constant is given for raising 1 lb or kg of water by 1 degree. I am using equations which use J's MEoH but with other substances. The equations come from a book on steam turbines so they no doubt...
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    Pressure due to boiling a liquid

    Hero! Many thanks!
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    Pressure due to boiling a liquid

    I meant heat Liquid Nitrogen to 0C (273K)
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    Pressure due to boiling a liquid

    I am looking for an equation to determine the pressure produced by boiling a liquid. (On the net I can only find information on the effect that pressure has on boiling point) for example, the pressure produced by heating liquid nitrogen to 0K. Any help would be great! Thank you
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    How Much Torque Is Required to Start a Motor Used as a Generator?

    Hi everyone, I'm new here. I'm taking electronics engineering at exeter uni and I can't find an equation for my current project. Its to do with max efficiency from a Pelton wheel. I need to know how much torque it will take to turn a motor (used as a generator) from stationary (zero...