Hai dao động điều hòa cùng phương có phương trình lần l
A.\({A^2} = {A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} + {\varphi _1}} \right)\).
B.\({A^2} = {A_1}^2 + {A_2}^2 - 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
C.\({A^2} = {A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
D.\({A^2} = {A_1}^2 - {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
A.\({A^2} = {A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} + {\varphi _1}} \right)\).
B.\({A^2} = {A_1}^2 + {A_2}^2 - 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
C.\({A^2} = {A_1}^2 + {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
D.\({A^2} = {A_1}^2 - {A_2}^2 + 2{A_1}{A_2}\cos \left( {{\varphi _2} - {\varphi _1}} \right)\).
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Hóa Học lớp 12
