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Nội dung: <blockquote data-quote="ngoisaouocmo" data-source="post: 155254" data-attributes="member: 266982">Bài 76;<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />,lấy g=10= <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5Cpi%20%5E%7B2%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />=><img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5Comega%20=%5Csqrt%7B%5Cfrac%7Bg%7D%7B%5CDelta%20l_%7B0%7D%7D%7D=5%20%5Cpi" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20t_%7Bnen%7D=2%20%5Cfrac%7B%5CDelta%20%5Cvarphi%20%7D%7B%5Comega%20%7D=0,1%20%5CRightarrow%20%5CDelta%20%5Cvarphi%20=%5Cpi%20/4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20cos%5CDelta%20%5Cvarphi%20=%5Cfrac%7B%5CDelta%20l_%7B0%7D%7D%7BA%7D%20%5CRightarrow%20A=4%5Csqrt%7B2%7D=5,66" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Bài 77<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=mg/k=2,5cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> và <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20T=%5Cpi%20/10" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20t_%7Bdan%7D=2T/3=%5Cpi%20/15" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Bài 78 <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=0,02m=2cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />thời gian lò xo dãn t=2T/3=0,19=>DBài 79:A=10cm,<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=0,05m=5cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />thời gian lx nén là t=T/3=0,148Bài 80:<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=6" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />cmthời gian lx dãn là 2T/3 thì thời gian lx nén t=T-2T/3=T/3=>góc nến là 120 độ =>A=12 cmđộ dãn lớn nhất là <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D+A=6+12=18" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> =>BBài 81<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20t_%7Bnen%7D=%5Cfrac%7B2%5CDelta%20%5Cvarphi%20%7D%7B%5Comega%20%7D=T/4" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />mà <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5Comega%20=%5Cfrac%7B2%5Cpi%20%7D%7BT%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CRightarrow%20%5CDelta%20%5Cvarphi%20=%5Cpi%20/4%5CRightarrow%20A=%5Cfrac%7B%5CDelta%20l_%7B0%7D%7D%7Bcos%5CDelta%20%5Cvarphi%20%7D=%5Csqrt%7B2%7D%5CDelta%20l_%7B0%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />Bài 82 <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=2,5cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />thời gian lx dãn t=2T/3=0,21Bài 83:<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=1,5" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />,  <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20t_%7Bnen%7D=T/3=%3Et_%7Bdan%7D=2T/3" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> (thời gian lx ko bị nén chính là thời gian lx dãn)Bài 84x=3cm,lấy g=10=<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5Cpi%20%5E%7B2%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />   <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20A%5E%7B2%7D=x%5E%7B2%7D+%5Cfrac%7Bv%5E%7B2%7D%7D%7B%5Comega%20%5E%7B2%7D%7D=16%20%5CRightarrow%20A=4cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> với <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=1cm%20=%3Ex=2cm" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />pt <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20x=4cos%2810%5Cpi%20t+%5Cpi%20/3%29" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />=>t=T/4=0,05 tại t=o x=2  .Tại t=0,05 x=<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20-2%20%5Csqrt%7B3%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />  quãng đg S=2+<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%202%5Csqrt%7B3%7D" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />=5,46=>ABài 86 CBài 85.<img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20l_%7B0%7D=4cm%20%5CRightarrow%20%5Comega%20=5%5Csqrt%7B10%7D=5%20%5Cpi" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20%5CDelta%20%5Cvarphi%20=%5CDelta%20t.%5Comega%20=2%5Cpi%20/3" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> <img src="https://codecogs.izyba.com/png.latex?%5C150dpi%20S_%7Bmin%7D=2A%281-cos%5Cfrac%7B%5CDelta%20%5Cvarphi%20%7D%7B2%7D%29=%3EA=8" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />vận tốc cực đại v=125,66</blockquote>

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