Recent content by andrea1313

  1. andrea1313

    Terminal Speed of Vessel in Vacuum and Weightlessness

    In vacuum and weightlessness, at the bottom of a cylindrical vessel (a cup), there is a layer of solid substance of molar mass μ. This substance sublimes slowly (evaporates from the solid phase into gaseous phase) and pushes thereby the vessel to the opposite direction. Estimate the terminal...
  2. andrea1313

    Black cube, maximal and minimal value of equilibrium temperature T

    How i use vectors, i dont't get it?
  3. andrea1313

    Black cube, maximal and minimal value of equilibrium temperature T

    So i had this problem and I want a rigourous solution. The answer should be : Tmin=(I/sigma)^(1/4) and Tmax=(sqrt(3I)/sigma)^1/4
  4. andrea1313

    Undergrad What is the Maximal Parallel Velocity of a Satellite in an Elliptical Orbit?

    so I have this problem from olympiad the maximum value of the satellite velocity component parallel to the high axis of the ellipse(a) and the answer should be vmax=a/b*sqrt(G*M/a). How to prove this?