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  1. Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
  2. A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
  3. The unit of electric permittivity is
  4. The excess pressure inside one soap bubble is three times that inside a second soap bubble
  5. A Galilean telescope has an objective of focal length 100 cm and magnifying power 50