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vuongthienlong118
2 năm trước
Một con lắc đơn dao động điều hoà với biên độ góc $\alpha_{o}=5^{o}$. Động năng của con lắc gấp hai lần thế năng tại vị trí con lắc có li độ góc bằng A. $\alpha= ±1,19^{o}$ B. $\alpha= ±2,89^{o}$ C. $\alpha= ±3,59^{o}$ D. $\alpha= ±5,79^{o}$
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