Recent content by JSmith123

  1. J

    Efficiency of a heat engine in a reversible cycle

    Homework Statement A heat engine operates in a reversible cycle with the following steps: (i) An ideal gas characterized by γ = 1.4 expands adiabatically, so that it cools from an initial temperature of 330°C to 30°C. (ii) It is compressed isothermally until it reaches its initial volume...
  2. J

    Calculating Pressure from Falling Sand Shower

    Oh jeez the area is just 1m^2? I can't believe I didn't notice that. Anyways, thanks for the help.
  3. J

    Calculating Pressure from Falling Sand Shower

    I see, but what is the area?
  4. J

    Calculating Pressure from Falling Sand Shower

    Homework Statement Grains of sand of mass 3.10 10-3 g each, fall from a height of 0.8 m on a sticky surface at a rate of 50 grains per second per cm^2. What pressure does this shower of sand exert on the surface, assuming that air resistance can be neglected? Homework Equations P=F/A...