Each item below can be used to measure the distances of astronomical objects. Rank them according to how far away each method works, from nearest to farthest. (That is, put the method that works only in our solar system at the far left, and the method that can be used for the most distant galaxies at the far right.) radar ranging parallax white dwarf supernovae Cepheids

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?