Trái Đất quay quanh trục bắc - nam với chuyển động đều mỗi vòng 24h. a. Tính tốc độ góc của Trái Đất. b. Tính tốc độ dài của một điểm trên mặt đất có vĩ độ beta = 45 độ. Cho R = 6370km. c. Một vệ tinh viễn thông quay trong mặt phẳng xích đạo và đứng yên đối với mặt đất (vệ tinh địa tĩnh) ở độ cao h = 36500km. tính tốc độ dài của vệ tinh.

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