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4 February, 00:07

The density of water is 1 gram per cubic centimeter. A more dense object will sink, and a less dense object will float. Will a marble with a radius of 1.4 cm and a mass of 9 grams sink or float in water?

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  1. 4 February, 00:22
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    Ah clever. So you need two formulas.

    1) Volume of the marble.

    4 (pi) r^3/3

    = 4 (pi) (1.4) ^3/3

    = 11.49 (approx)

    2) Formula for density.

    D = M / V

    = 9 / 11.49

    = 0.78

    0.78 < 1

    Therefore the marble will float.
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