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  1. Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
  2. A hemispherical bowl of radius R is rotating about its axis of symmetry
  3. The heart of a man pumps 5 litres of blood through the arteries per minute at
  4. The electric current in AC circuit is given by the relation i-3 sinωt+4 cos ωt.
  5. A black hole is an object whose gravitational field is so strong that even light