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Gravitational fields (A-level only)

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Question 38

A deep-space probe measures the gravitational potential at the surface of a homogeneous, spherical exoplanet, Astraea-X, to be $- U$ .

A second homogeneous, spherical exoplanet, Astraea-Y, is discovered with 0.8 times the density and 2.5 times the radius of Astraea-X.

What is the gravitational potential at the surface of Astraea-Y?

$- 2 U$

$- 4 U$

$- 5 U$

$- 10 U$

Gravitational fields (A-level only) Questions

A Level
Physics
Gravitational fields (A-level only)