Một vật dao động điều hòa, có phương trình li độ (x tính bằng cm, t tính bằng s). Kể từ thời điểm t = 0, thời điểm vật qua vị trí có li độ theo chiều âm lần thứ 2017 là:

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  You should stop wasting your time and doing something useful instead.         

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Her passion for helping people have motivated her to found her own charity organization.          

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:
  

  Life that we know it is based on  the element carbon.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  It’s thirty years since this thirty-storeys building was built.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Most bacteria has strong cell walls much like those of the plants.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Each of the students in the accountant class has to type their own research paper this semester.         

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

  The Concord can fly across (A) the Atlantic without (B) refueling (C) and carrying (D) 11 tons of freight.         

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

   On (A) the floor of the Pacific Ocean is (B) hundreds of (C) flat-topped mountains more than (D) a mile beneath sea level.         

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

  Drying (A) food by means of (B) solar energy is an ancient process applying (C) wherever climatic conditions make it possible. (D)         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Most bacteria has strong cell walls much like those of the plants.