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Two spheres are cut from a certain uniform rock. One has radius 4.95 cm. The mass of the other is seven times greater. Find its radius.

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- #1

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Two spheres are cut from a certain uniform rock. One has radius 4.95 cm. The mass of the other is seven times greater. Find its radius.

- #2

jcsd

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[tex]\rho = \frac{m}{V}[/tex]

Where m is mass and V is volume

The volume of a sphere is:

[tex]V = \frac{4\pi}{3} r^3[/tex]

Where r is the radius.

These are the only two formulas you need.

- #3

Tide

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Does this look familiar?

[tex]\frac {R_1}{R_2} = \left(\frac{M_1}{M_2}\right)^{\frac{1}{3}[/tex]

[tex]\frac {R_1}{R_2} = \left(\frac{M_1}{M_2}\right)^{\frac{1}{3}[/tex]

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- #5

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Okay, nevermind, I got the answer at 9.469

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