A student is trying to determine some information about a metal sphere. He weighs a piece of metal sphere and it weighs 8.25g. When a student places it into a graduated cylinder containing water, the liquid levels rises from 6.25 mL to 10.47 mL. Part 1: What is the density of the metal sphere? Part 2: what is the radius of the metal sphere in mm?

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A: The unit conversion from feet to cm is shown below.