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Exam preparation: Proportional reasoning

How can you to approach proportional reasoning questions on Paper 1a? A special type of question There is a style of Paper 1a (multiple choice) question that has become especially popular in recent years. Here's an example: Planet X has diameter D and density ρ. Planet Y has diameter 2D and density ρ/4. The gravitational field strength on the surface of Planet X is g. What is the gravitational field strength on the...

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