WB JEE 2019 | Gravitation Question 7 | Physics

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

Assume that the earth moves around the sun in a circular orbit of radius R and there exists a planet which also move around the sun in a circular orbit with an angular speed twice as large as that of the earth. The earth of the orbit of the planet is

$${2^{ - 2/3}}$$ R

$${2^{ 2/3}}$$ R

$${2^{ - 1/3}}$$ R

$${R \over {\sqrt 2 }}$$

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

The ratio of accelerations due to gravity g₁ : g₂ on the surfaces of two planets is 5 : 2 and the ratio of their respective average densities $${{\rho _1}}$$ : $${{\rho _2}}$$ is 2 : 1. What is the ratio of respective escape velocities v₁ : v₂ from the surface of the planets?

5 : 2

$${\sqrt 5 }$$ : $${\sqrt 2 }$$

5 : 2$${\sqrt 2 }$$

25 : 4

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