حلول التدريبات العملية الجاذبية - ديناميكا (دون الطاقة)

29. بב.22- ارتفاع أقمار الاتصالات.

القوة الوحيدة المؤثرة على القمر الاصطناعي هي قوة الجاذبية العامة.

نكتب معادلة الحركة الدائرية:

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نعبر عن نصف قطر مدار القمر الاصطناعي كمجموع نصف قطر الكرة الأرضية وارتفاع القمر الاصطناعي فوق سطح الأرض.

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نحسب ارتفاع القمر الاصطناعي بدلالة نصف قطر الكرة الأرضية وكتلتها.

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لذلك ، لكي تكون أقمار الاتصالات التي تتحرك حول الكرة الأرضية فوق نقطة ثابتة، يجب أن تتحرك على ارتفاع 35.84 مليون متر فوق سطح الأرض.