Consider as a system the sun with saturn in a circular orbit around it. find the magnitude of the change in the velocity of the sun relative to the center of mass of the system during the time saturn completes half an orbit. assume the mass of the sun is 5.68 x10^29 kg, the mass of saturn is 5.68 x10^26 kg, its period is 9.29 x10^8 s, and the radius of its orbit is 1.43 x 10^12 m. ignore the influence of other celestial objects.?

Explanation:

If the sun considered as x=0 on the axis to put the center of the mass as a:

solve to r1

Now convert to coordinates centered on the center of mass.  call the new coordinates x' and y' (we won't need y').  Now since in the sun centered coordinates the angular momentum was  

where T = orbital period

then L'(x',y') = L(x) by conservation of angular momentum.  So that means

Since

then

spare some change and give it to the poor

explanation:

plz : ((

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.