4MA1/2H Jun 2018, Question 11: Compound Measures
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 3 marks
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The question, in short
Calculate the density of a metal sphere with radius 1.5 cm and mass 109.6 grams, giving the result to 3 significant figures.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 3 marks
- 1Volume of a sphere = 4/3 × π × r³
- 2V = 4/3 × π × 1.5³ = 14.137... cm³
- 3Density = mass ÷ volume = 109.6 ÷ 14.137... = 7.752...
- 4To 3 significant figures: 7.75
Answer7.75
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