Hai dao động điều hòa cùng phương, cùng tần số, lệch nhau một góc 0,5π, dọc theo trục tọa độ Ox. Các vị trí cân bằng cùng có tọa độ x = 0. Tại thời điểm t, li độ của các dao động lần lượt là x1 = 4 cm và x2 = 3 cm, khi đó li độ của dao động tổng hợp bằng:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  He looked __________ when he heard the news.
  
  

• Choose the best answer for the following sentence:

  I think John is ___________ in love with a Japanese girl.
  
  

• Choose the best answer for the following sentence:

  In the past, the parents of the bride and the groom __________ on the marriage.
  
  

• Choose the best answer for the following sentence:

  A survey was conducted to find out the students’ attitudes __________love and marriage.
  
  

• Choose the best answer for the following sentence:

  When I come to school tomorrow, __________ .
  
  

• Choose the best answer for the following sentence:

  I telephoned David at 4.30, but ____________ .
  
  

• Choose the best answer for the following sentence:

  For the last ten years ________ in South Africa.
  
  

• Choose the best answer for the following sentence:

  I hope _________ by the end of the day.
  
  

   

• Choose the best answer for the following sentence:

  _________ while he has climbing it.
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

   The children have been doing their homework and by 10 o’clock they still hadn't finished.