Hai dao động điều hòa cùng phương, cùng tần số. Tại thời điểm t, li độ của dao động thứ 1 là 15 mm thì li độ tổng hợp của hai dao động trên là 45 mm; li độ của dao động thứ 2 bằng:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  release              reserve             demand             nuclear

• Choose a word that has different stress pattern:

  infinite             potential               energy              plentiful

• Choose a word that has different stress pattern:

  exhausted             researcher              pollute              windmill

• Choose the best answer for the following sentence:

  He is the only student _____________ the maths problems yesterday.
   

• Choose the best answer for the following sentence:

  We're living in a house _____________ by green trees.
  
  

• Choose the best answer for the following sentence:

  The first person _____________ the classroom last Monday might know the reason.
  
  

• Choose one sentence that has the same meaning as the root one:

  Some students in my school got scholarship and John was the sixth of them
  
  

• Choose one sentence that has the same meaning as the root one:

  A waitress served me. She was impolite and impatient.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  consider               suitable              Asian              aside

• Choose one sentence that has the same meaning as the root one:

  The man told me to oil the car. I bought the car from him.