ANSWERS1. centripetal force, gravitational pull2. posigrade3. ellipse4. geocenter5. period6. 0,907. 58. geosynchronous or geostationary9. attitude10. spin, three-axis stabilization11. yaw, pitch, roll12. subsatellite point13. latitude, longitude14. azimuth, elevation15. apogee kick motor16. communications17. relay station18. earth station19. down link20. transponder21. microwave22. C23. X24. 10.95, 14.525. 50026. 12,3627. frequency reuse28. spatial isolation29. voice, video, computer or digital data30. low-noise amplifier31. signal amplification, frequency translation, power amplification32. mixer33. TWT34. double-conversion35. regenerative36. bandpass filter37. broadband, multichannel38. solar panels39. batteries 40. monitor, control41. jet thrusters42. baseband43. down converter44. 7045. demodulation, demultiplexing46. modulation, multiplexing47. FM, QPSK 48. up converter49. frequency synthesizers50. transistor, TWT, klystron51. backup power or uninterruptible power supply52. false53. communications54. film cameras, TV cameras, nfrared sensors, radar55. Global Positioning System (GPS), navigation56. weather forecasting, spying, earth resources, monitoring57. TV receptionCHAPTER 111. A2. A3. D4. B5. B6. C7. C8. B9. D10. C11. D12. B13. A14. B15. A16. D17. C18. B19. B20. B21. C22. D23. C24. B25. D26. B