Question

The density of the newly discovered planet 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 is R, the radius of the planet would be

• A. 4R
• B. $\frac{1}{4}$ R
• C. $\frac{1}{2}$ R
• D. 2R

Answer 1

Answer: (C)

$\frac{1}{2}$ R

Answer 2

If the density of a newly discovered planet is twice that of Earth and the acceleration due to gravity at the surface of the planet is equal to that at the surface of Earth, then the radius of the planet would be 2R.