Question

Asked Dec 17, 2019

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An exoplanet has twice the mass and half the radius of the

Earth. Find the acceleration due to gravity on its surface, in

terms of g, the acceleration of gravity at Earth’s surface. (a) g

(b) 0.5g (c) 2g (d) 4g (e) 8g.

Step 1

Option (e) is correct

Explanation is as follows.

The expression for the acceleration due to gravity *g* on the earth’s surface is given by,

Step 2

Here *ME *is the mass of the earth and *rE *is the radius of the earth. *G* is the gravitational constant.

For an exoplanet with given radius *r’* and ...

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