1.

How much energy must be spent to pull the satellite in Q. No. 304 out of the earth's gravitational field? (If the earthshrink suddenly to half its present size.)

Answer»

`(GmM)/(2(R+H)^(2))`
`(GmM)/(4(R+h)^(2))`
`(GmM)/(2(R+h))`
`(GmM)/(4(R+h))`

Solution :`r_(1)=h_(1)+(R)/(2)+(R)/(2)`
`r_(1)=h_(1)+R`


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