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FayeWong

New Member

• 6/7/16

• #2

Hình như bài này đáp án là 400. Pi/3 hay sao chứ, biên đô A=10cm

 

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Nguyễn Văn Phú

New Member

• 6/7/16

• #3

$KA=2$
$\dfrac{1}{2}KA^{2}=0,1$
$\Rightarrow A=10cm. K=20 \ \text{N}/\text{m}$
Fđh=1N $\Leftrightarrow x=5cm$
vẽ đường tròn suy ra w=$\dfrac{\dfrac{2\pi }{3}}{0,1}=\dfrac{20\pi }{3}$
vMax=wA=$\dfrac{200\pi }{3}\Rightarrow A$ đúng

 

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tan sang

New Member

• 8/7/16

• #4

2T/3 = 0.1 suy ra T=0.3/2=0.15 chu sao lai la 3/0.1 vay?

 

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Nguyễn Văn Phú

New Member

• 8/7/16

• #5

tan sang đã viết:

2T/3 = 0.1 suy ra T=0.3/2=0.15 chu sao lai la 3/0.1 vay?

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Nó quét cung 2pi/3 suy ra thời gian T/3 mà bạn.

 

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tan sang

New Member

• 8/7/16

• #6

Vay la F cuc dai =1 N do la khong tinh chieu am ha ban?

 

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Nguyễn Văn Phú

New Member

• 8/7/16

• #7

 

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tan sang

New Member

• 11/7/16

• #8

Ok cam on ban

 

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