1.

The mass of the earth is 6xx10^(24) kg and that of the Moon is7.4 xx10^(22) kg. The constant of gravitation G is 6.67 xx10^(-11) "Nm"^(2) "kg"^(-2) The potential energy of the system is-7.79xx10^(28)J The mean distance between the Earth and Moon is .......... metre.

Answer»

`3.80 xx10^(8)`
`3.37xx10^(8)`
`7..60xx10^(8)`
`1.90xx10^(2)`

SOLUTION :`U = (-GMM)/r rArr = 3.8 xx10^(8)m`


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