JEE Main Physics question

An astronaut on a strange planet finds that acceleration due to gravity is twice that on the surface of earth. Which of the following could explain this? [K CET 2010]

(A)Both the mass and radius of the planet are half that of earthCorrect
(B)Radius of the planet is half that of earth, but the mass is the same as that of earth
(C)Both the mass and radius of the planet are twice that of earth
(D)Mass of the planet is half that of earth, but radius is the same as that of earth

Answer: (A)

Solution

. Halving both and : \dfrac{G(M/2)}{(R/2)^2}\dfrac{G(M/2)}{R^2/4}\dfrac{2GM}{R^2}$=2g

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-154583