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  1. Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁
  2. In R-L-C series circuit, the potential differences across each element is 20 V.
  3. If the number of radius of ²⁷Al is 3.6 Fermi, the approximate nuclear radius
  4. During mean life of a radioactive element, the fraction that disintegrates is
  5. An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min