Cho cơ hệ gồm ba vật m1 = 2 kg, m2 = 3 kg, m3 = 4 kg lần lượt nối với nhau bằng hai sợi dây nhẹ không giãn, đặt trê mặt phẳng nằm ngang không ma sát như hình vẽ. Khi tác dụng lên m1 một lực kéo F = 18 N, lực căng tác dụng lên hai sợi dây và gia tốc chuyển động của cơ hệ là  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  _________ they leave before supper or do they have time to stay until my friends come?
   

• Choose the best answer for the following sentence:

  I think you __________ practise driving every day to become a safe driver.
   

• Choose the best answer for the following sentence:

  You __________ have my car if you like. I shan’t be using it tomorrow.
   

• Choose the best answer for the following sentence:

  ____________ you remember what you were doing at this time yesterday?
   

• Choose the best answer for the following sentence:

  Every time I miss the bus, it means that I ____________ walk to work.
   

• Choose the best answer for the following sentence:

  Every time when I missed the bus, I ___________ to return home late.
   

• Choose the best answer for the following sentence:

  The ring you found ___________ be returned to an old lady who had lost it.
   

• Choose the best answer for the following sentence:

  I didn’t have much time, but I __________ visit a lot of places of interest in London.
  
  

• Choose the best answer for the following sentence:

  I _________ understand this letter. Will you translate it for me?
   

• Choose the best answer for the following sentence:

  Daisy’s parents don’t let her go to late-night disco. She ___________ be at home
  at 9 o’clock in the evening.