問題詳情
42. A synchronous satellite revolves around the Earth in acircular orbit.
(A)Its acceleration is zero because its speed is constant.
(B)Its acceleration is zero because its velocity is constant.
(C)Its speed varies because its acceleration is constant.
(D)Its acceleration and its velocity are both not constant.
參考答案
答案：D
難度：非常困難0
統計：A(1),B(1),C(3),D(0),E(0)