Recent content by Katie1990

  1. K

    Why Does Tension Peak at Geostationary Height in a Space Elevator?

    I managed to solve this I had forgotten that tension has no direction, I had been cancelling tensions rather then summing them!
  2. K

    Why Does Tension Peak at Geostationary Height in a Space Elevator?

    Homework Statement I am tasked to summarise this paper http://chaos.swarthmore.edu/courses/PDG07/AJP/AJP000125.pdf I am struggeling to understand the statements of tension at the bottom of the first side namely For an element at geostationary height that is, at a distance from the...
  3. K

    What is the Speed of the CM Frame in Particle Decay?

    Homework Statement A particle of mass M, traveling horizontally through the laboratory, decays into two daughter particles, each of mass 0.4M. One of the daughters, A, is produced at rest in the Lab frame. Show that vcm , the speed with which the CM frame moves in the Lab frame, is equal...
  4. K

    Finding Entropy with three natural variables

    Homework Statement Given G =U −TS+PV −BaM show that S(T,Ba,P) = -(dG/dT)Ba,P Homework Equations The Attempt at a Solution I know how to proceed if there are two variables and attemped to use this giving dG = dU - TdS - SdT +PdV +VdP - BadM -MdBa Using central...
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    Heating an Ideal Gas: Why Burning Fuel is Equivalent to Reversible Heating

    The question asks me to explain why burning a fuel that is clearly not reversible is the same as if heat was supplied reversibly.
  6. K

    Heating an Ideal Gas: Why Burning Fuel is Equivalent to Reversible Heating

    Homework Statement I'm struggling to explain why for an ideal gas at constant pressure heating by burning fuel is equivalent to reversible heating. I know that all forms of work on a ideal gas are eqivalent but don't know why. Homework Equations The Attempt at a Solution