The (volume) density of an object is its mass divided by its volume. This is typically expressed with the greek letter ρ (rho), so that ρ = m/V . Let ρal be the density of aluminum and ρfe be the density of iron. Suppose a metal sphere of aluminum has the same mass as a metal sphere of iron. If the aluminum has a radius R, what must the radius of the iron be? (You will need to look up the volume of a sphere

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