Một chất diểm dao đông điều hòa với chu kì 0,5π s và biên độ 4 cm. Vận tốc của chất điểm tại vị trí cân bằng có độ lớn bằng ? 

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Do you know where the _____________ director of the theatre is?
   

• Choose the best answer for the following sentence:

  At last she could not succeeded ___________ acting, which made the director very angry.
   

• Choose the best answer for the following sentence:

  The play is ___________. We are all ____________ to see it.
   

• Choose the best answer for the following sentence:

  The problem of violence on screen is ____________, so many people who are ____________ with it are very ___________. 
   

• Choose the best answer for the following sentence:

  The director is ___________ English but his wife is ____________ Swede.
  
  

• Choose the best answer for the following sentence:

  I am bored up with watching ___________ films all ____________ time.
   

• Choose the best answer for the following sentence:

  It is __________ films that help us widen our knowledge of cultures, coun-tries, and people.
   

• Choose the best answer for the following sentence:

  I would rather read books _____________ go to the cinema.
   

• Choose the best answer for the following sentence:

  Which is ___________, films or plays?
   

• Choose the best answer for the following sentence:

  These teenagers ____________ action movies to cartoons.