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13 June, 20:48

The gravitational self potential energy of a solid ball of mass density ρ and radius R is E. What is the gravitational self potential energy of a ball of mass density ρ and radius 2R in terms of E?

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  1. 13 June, 21:11
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    It will be

    E = mgh.

    where h and g are constant thus

    m can be written as 4/3πr^3*density

    E = 4/3πr^3 * density

    E? = 4/3π (2R) ^3 * density

    = 4/3π8r^3

    thus the e will be 4/3π8r^3 * density/4/3πr^3*density nd thus you get 8E ...
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