# Satellites in orbit

i solved it. thanks to all who responded

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shouldnt the answer be the same as the one in part a?

Apply the energy conservation.

andrevdh
Homework Helper
No, its speed needs to be increased at point 1 so that it matches the speed if it were in the elliptical orbit. This will then transfer it into the new elliptical orbit, or stated differently its energy need to be increased (kinetic) so that it matches the energy of the elliptical orbit at that point (the potential energy is the same at that point for both orbits).

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Galileo
Homework Helper
nick727kcin said:
a.)Consider a 1000 kg communication satellite that needs to be boosted from an orbit 300 km above the earth to a geosynchronous orbit 35,900 km above the earth. Find the velocity v_1 on the lower circular orbit.

this came out to be: 7730m/s
Can you show how you got that answer?

thanks for responding guys, and i got that answer by using this formula:

v= (sq. root) GM/(Re+h)

part a is definately right, though

Hootenanny
Staff Emeritus