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【单选题】
半径为30cm的飞轮,从静止开始以0.5rad/s2的角加速度匀加速转动,则飞轮边缘上一点在转过240°时的切向加速度为和法向加速度分别为( )。A.
0.30m/s2,0.12πm/s2
B.
0.15m/s2,0.4πm/s2
C.
0.30m/s2,0.4πm/s2
D.
0.15m/s2,0.12πm/s2
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B.
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