college physics

Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4ðr63/3]

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  1. Assumeing density is the same.

    MassA=density*4/3 PI ra^3
    MassB= density*4/3 PI rb^3

    divideing the second by the first

    8=(rb/ra)^3 It sure looks like the ratio of rb/ra is 2.

    check my work.

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    bobpursley

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