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.

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Expert Answer

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,

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GM; r.

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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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GM' 8':

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