問題詳情
5. 一人造衛星繞著地球運行的軌道半徑為 R，速 率 為 v。若 此 人 造 衛星的軌道半徑變為 2R時，則其運行速率為 v的多少倍？
(A) 
(B) 
(C) √2
(D) 2
參考答案
無參考答案
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