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[" Droblems For Practice "],[" 1.A spher...

[" Droblems For Practice "],[" 1.A spherical mass of "20kg" lying on the surface of "],[" the earth is attracted by another spherical mass of "],[150kg" with a force equal to the weight of "0.25mg" ."],[" The centres of the two masses are "30cm" apart."],[" Calculate the mass of the earth.Radius of the earth "],[=6times10^(6)m" ."]

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