Exercises for the cosmology block course

Though on exercises for the Cosmology Block course:

Day 1: Newtonian cosmology:
   Exercise: things to do with the collapsing top hat:
   -- explain that (in three days) we'll see that overdose parts of the Universe
can be treated as Newtonian Universes
  -- the collapsing sphere:
     -- toy-problem
     -- "virializing"
     -- properties
     -- application to the Milky Way:
        we take v_circ --> v_virial --> mass, size, etc..


Day 2: Friedman-Robertson Walker Universe
    -- code up, and plot, the angular diameter distances; luminosity distances
       as a function of cosmological parameters;
   -- what are the uncertainties implied by current Cosmol. parameter uncertainties
    -- application: what's size of a galaxy of 1kpc size at z=0.5,2,7