[Vật lý 12] Bài tập

N

nguyen_van_ba

Giải:
Xét trong 1T:
[TEX]t_{gian}=2t_{nen}\\t_{gian} + t_{nen} =T\\\Rightarrow t_{nen}=\frac{T}{3}\\\Rightarrow \alpha =120\\\Rightarrow x=A\cos 60 =\frac{A}{2}\\\Rightarrow \Delta l=A-x=\frac{A}{2}\\\Rightarrow A=2\Delta l\\\Rightarrow a_{max}=\omega ^2A=\frac{k}{m}.2\Delta l[/TEX]
Mà tại vtcb:
[TEX]mg=k\Delta l\\\Rightarrow \frac{k}{m}=\frac{g}{\Delta l}\\\Rightarrow a_{max}=2g[/TEX]
 
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