Question

The ratio of kinetic energy of a body orbiting near the earth's surface and the kinetic energy of the same body escaping then what is earth's gravitational field

Answer 1

Answer:

For any orbit we must have the centripetal force equal to the gravitational force. So this gives:

2=2

where in this case is Earth’s mass, the satellite mass, the satellite speed, and the satellite distance from the Earth’s centre. Hence the kinetic energy of the satellite is:

=122=22=22=2

Now the kinetic energy needed to escape gravity is that needed to cancel the satellite’s gravitational potential energy with respect to Earth which is;

=−

Hence we can see that the satellite requires a kinetic energy of 2, ie: twice its existing orbital kinetic energy

Explanation:

Answer 2

0.5 is it's right answer.....