1.

A satellite revolving close to earth has a K.E., E. What energyshould be given to it so make it escape the gravitational pull of earth?

Answer»

`(E )/(2)`
`E`
`(E )/(sqrt(2))`
`2 E`

Solution :Energy of satellite when REVOLVING CLOSE to earth is `E=(1)/(2)mv_(0)^(2)` and energy required to escape the gravitational pull is
`E.=(1)/(2)mv_(e )^(2)=(1)/(2)m(sqrt(2)v_(0))^(2)=2((1)/(2)mv_(0)^(2))`
`therefore E.=2E`
`therefore ` Additional energy to be given
`=E.-E=2E-E=E`
Thus correct choice is (b).


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