Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 315 / 4 / d / Solution Created 2026-09-24 Updated 2026-09-25
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The mass fractions of the planet are
(1)
On an exoplanet bulk-composition ternary diagram with iron, silicate, and hydrogen vertices, it lies in the interior on the line of equal iron and silicate fractions, one fifth of the way from the iron-silicate edge toward the hydrogen vertex.
Neglecting its atmosphere and minor volatile reservoirs, Earth lies on the iron-silicate edge at approximately
(2)
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