Bài 5: Tổng hợp 2 dao động điều hòa cùng phương, cùng tần số

$A=\sqrt{A_1^2+A_2^2+2A_1^{ }A_2^{ }\cos\left(\phi_2-\phi_1\right)}$

$A=\sqrt{A_1^2+A_2^2-2A_1^{ }A_2^{ }\cos\left(\phi_2-\phi_1\right)}$

$A=\sqrt{A_1^{ }+A_2^{ }+2A_1^{ }A_2^{ }\cos\left(\phi_2-\phi_1\right)}$

$A=\sqrt{A_1^{ }+A_2^{ }-2A_1^{ }A_2^{ }\cos\left(\phi_2-\phi_1\right)}$

 $\tanφ_{ }=\frac{A_1\sin\theta_1+A_2\sin\theta_2}{A_1\cos\theta_1+A_2\cos\theta_2}$  

 $\tanφ_{ }=\frac{A_1\sin\theta_1-A_2\sin\theta_2}{A_1\cos\theta_1-A_2\cos\theta_2}$  

 $\tanφ_{ }=\frac{A_1\cos\theta_1+A_2\cos\theta_2}{A_1\sin\ \theta_1+A_2\sin\theta_2}$  

 $\tanφ_{ }=\frac{A_1\cos\theta_1-A_2\cos\theta_2}{A_1\sin\ \theta_1+A_2\sin\theta_2}$  

$\left|A_1-A_2\right|\le A\le A_1+A_2$

$A=A_1+A_2$

$A=A_1-A_2$

$A=\sqrt{A_1^2+A_2^2}$

$\left|A_1-A_2\right|\le A\le A_1+A_2$

$A=A_1+A_2$

$A=A_1-A_2$

$A=\sqrt{A_1^2+A_2^2}$

$\left|A_1-A_2\right|\le A\le A_1+A_2$

$A=A_1+A_2$

 $A=\left|A_1-A_2\right|$ 

$A=\sqrt{A_1^2+A_2^2}$

$\left|A_1-A_2\right|\le A\le A_1+A_2$

$A=A_1+A_2$

 $A=\left|A_1-A_2\right|$ 

$A=\sqrt{A_1^2+A_2^2}$

(2n + 1) π/4 với n = 0, ±1, ±2...

(2n + 1)π/2 với n = 0, ±1, ±2...

(2n + 1) π với n = 0, ±1, ±2...

2nπ với n = 0, ±1, ±2...

(2n + 1) π/4 với n = 0, ±1, ±2...

(2n + 1)π/2 với n = 0, ±1, ±2...

(2n + 1) π với n = 0, ±1, ±2...

2nπ với n = 0, ±1, ±2...

5 cm.

2 cm.

21 cm.

3 cm.

4 cm.

8 cm.

6 cm

15 cm.