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  1. The acceleration due to gravity near the surface of a planet of radius R and density d
  2. The mean radius of the earth is R, its angular speed on its own axis is ?
  3. The operation of a nuclear reactor is said to be critical, if the multiplication
  4. The magnetic flux linked with a coil at any instant t is given by ?, find emf
  5. A siren emitting sound of frequency 800 Hz is going away from a static listener