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MHT CET202122 Sep 2021Evening ShiftPhysicsGravitationActual

Two satellites of equal mass are launched in circular orbits at heights ' R ' and ' 2 R ' above the surface of the earth. The ratio of their kinetic energies is ( R = radius of the earth)

Options

  1. A1:3
  2. B3:2
  3. C4:9
  4. D9:4

Correct answer

B. 3:2

Step-by-step solution

Kinetic energy of a satellite is given by K E = GMm 2 r The two satellites are of the same mass aligned & K E 1 r & ( K E )₁ ( ~K E )₂ = r ₂ r ₁ = 3 R 2 R = 3 2 aligned

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