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Find the minimum radius of a planet of m...

Find the minimum radius of a planet of mean density `5500kgm^(-3)` and temperature `400^(@)C` which has retained oxygen in its atmosphere. Density of oxygen at STP `=1.424kgm^(-3). G=6.6xx10^(-11)Nm^(2)kg^(-2)`

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The correct Answer is:
`4.15xx10^(5)m`
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