On an exoplanet the surface acceleration due to gravity is

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

On an exoplanet the surface acceleration due to gravity is 15 m/s215\,\text{m/s}^2. Assuming the planet’s average density is 5.5×103 kg/m35.5\times10^{3}\,\text{kg/m}^3 (the same as Earth) and using G=6.67×10−11 N m2/kg2G = 6.67\times10^{-11}\,\text{N m}^2\text{/kg}^2, estimate the radius of the planet.

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