Hai lực , có F₁ = F₂ = F có gốc trùng nhau. Đầu tiên 2 lực cùng hướng, một lực quay quanh gốc O. Độ lớn của hợp lực thay đổi theo góc α theo hình nào sau đây? (α là góc hợp bởi và  ).

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:

  She ________ to the station every day but then she suddenly decided to walk instead.         

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:   

  Fort Niagara was built by the French in 1762 on land ________ the Seneca Indians.         

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:  

  If I ________ following that other car too closely, I would have been able to stop in the time instead of running into it.         

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:  

  I’ve never had the slightest disagreement ________ him ________ anything.         

• Mark the letter A, B, C or D to indicate the correct answer to each of the following questions:

  A quick look would reveal that France has twice ________ computers.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  We ________for three hours and are very tire.          

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  You shouldn't _________to your teacher like that. It was very rude.           

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:  

  _______ non-verbal language is _______ important aspect of interpersonal communication.             

• Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions:   

  It is believed ________causes insomnia.         

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

  Modem art is on display at the Guggenheim Museum, a building with an unusually design.