To solve this problem, we first need to define density.

Density is the ratio of mass and volume of a substance.

Density is expressed as:

$\overline{){\mathbf{\rho}}{\mathbf{=}}\frac{\mathbf{m}}{\mathbf{V}}}$, where **ρ** is the density, **m **is the mass, and **V** is volume.

From this equation, we can get the mass of the sphere to be:

$\overline{){\mathbf{m}}{\mathbf{=}}{\mathbf{\rho}}{\mathbf{V}}}$

Two spheres are cut from a certain uniform rock. One has radius 4.50 cm. The mass of the other is five times greater. Find its radius.

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