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  1. At what angle should the two forces 2P and √2 P act,so that the resultant force is P√10?
  2. Light propagates rectilinearly because of its
  3. A source of light is placed at a distance of 50 cm from a photocell and the stopping
  4. A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where
  5. Number of spectral lines in hydrogen atom is