Two satellites are in circular equatorial orbits of different altitudes. Satellite A is...

Two satellites are in circular equatorial orbits of different altitudes. Satellite A is in a geosynchronous orbit (one with the same period as the earth’s rotation so that it “hovers” over the same spot on the equator). Satellite B has an orbit of radius r_B = 30 000 km. Calculate the velocity which A appears to have to an observer fixed in B when the elevation angle is (a) 0 and (b) 90^o. The x-y axes are attached to B, whose antenna always points toward the center of the earth ( -y-direction). Consult Art. 3/13 and Appendix D for the necessary orbital information.