Question: If a 15 cm diameter cast iron ball has a mass of 6.25 kg; then what diameter must a similar ball need in order

If a 15 cm diameter cast iron ball has a mass of

If a 15 cm diameter cast iron ball has a mass of 6.25 kg; then what diameter must a similar ball need in order to have a mass of 4.15 kg. Give your answer rounded to 3 significant digits.

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