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NEET2004PhysicsGravitationActual

The density of a newly discovered plant is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth R , the radius of the planet would be:

Options

  1. A2 R
  2. B4 R
  3. C1 4 R
  4. D1 2 R

Correct answer

D. 1 2 R

Step-by-step solution

We know that: aligned g= G M R^2 & = G 4 3 R^3 R^2 & = 4 3 G R aligned New according to the question aligned g_ planel & =g_ earh R_ planel & = R_ earth 2 aligned

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