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【单选题】
小车以速度 v 沿直线运动,车上一轮以角速度 w 绕 O 转绕动,若以轮缘上一点 M 为动点,车厢为动坐标系,则 M 点的科氏加速度的大小为 __ _____ 。A.
2 w v
B.
2 w v cos
C.
0
D.
2 w v sin j 。
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B.
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D.
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