9. Two identical satellites, A and B, are circling around Earth in circular orbits. Given the orbital radius of A is twice that of B, what is the ratio of the speed of A to the speed of B?
(A) 1
(B) √2
(C) 1/√2
(D) 2
(E) 1/2

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題目解析 這道題目考察的是兩個衛星在圍...
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