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If 5 kg of iron powder is cast into an iron ball, what is the diameter of the iron ball?
Volume of iron ball:

V=m/ρ

5 kg

= -

7800kg/m?

= 1/ 1560 m?

Let the diameter be d,

Because V=4πr? /3

So d = 2r = 2x? √(V×3/4π)

= 0.107m

Answer: The diameter is 0.107m.