A space vehicle is in circular orbit about the earth. The mass of the vehicle is

Question

A space vehicle is in circular orbit about the earth. The mass of the vehicle is 2850 kg. The radius of the orbit is 2RE. It is desired to transfer the vehicle to a circular orbit of radius 4RE.


(B) An efficient way to accomplish the transfer is to use a semielliptical orbit (known as a Hohmann transfer orbit), as shown. What velocity changes are required at the points of intersection, A and B? Express the change in speed as the percentage of the speed just before the change.

Got 865 m/s for A and 726 m/s for B what does it mean by percentage?

(C) For the Hohmann transfer orbit, calculate the kinetic energy just before point A, just after point A, just before point B and just after point B. Express the results as a ratio to the kinetic energy of a circular orbit of radius 2RE.

Explanation / Answer

The diagram is not visible, still i will try. The change required is always calculated to initial value , as i can't calculate the values, i am assuming yours are right. change = 865-726 = 139 m/s So percentage change = 139*100 / 865 = 16 %

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