2026 IGCSE Additional Mathematics May/June 0606/22 Q12

2026 IGCSE Additional Mathematics May/June 0606/22 Q12

4 marks

A sphere has volume \(V\text{ cm}^3\) and radius \(r\text{ cm}\).

Given that \(r\) varies with time \(t\), find \(V\) at the instant when \(\dfrac{\mathrm dV}{\mathrm dt}=9\dfrac{\mathrm dr}{\mathrm dt}\).[4]

Solution:

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Answer:\(\dfrac9{2\sqrt\pi}\text{ cm}^3\), assuming \(\dfrac{\mathrm dr}{\mathrm dt}\ne0\) at that instant.

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