Con lắc lò xo dao động điều hòa trên mặt phẳng nằm ngang. Vật nhỏ có khối lượng 20 g. Lực kéo về cực đại bằng 3,2 N, tốc độ cực đại bằng cm/s. Độ cứng của lò xo bằng ?

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  She demanded that she ___________ allowed to meet her son in prison.
   

• Choose the best answer for the following sentence:

  __________ if you take the map with you.
    

• Choose the best answer for the following sentence:

  Don't worry. You _________ told if there's a change of the plan.
   

• Choose the best answer for the following sentence:

  There has been an accident on the motorway, ___________ long delays.
   

• Choose the best answer for the following sentence:

  The house is ________ need of a thorough clean.
   

• Choose the best answer for the following sentence:

  After a lot of difficulty, he ____________ to open the door.
   

• Choose the best answer for the following sentence:

  The teacher _________ them that she was going to hold a English-speaking club.
   

• Choose the best answer for the following sentence:

  I knew him _____________ I was a child.
   

• Choose one sentence that has the same meaning as the root one:

  His wife said it was quite unusual for him to read in bed
  
  

• Choose one sentence that has the same meaning as the root one:

  "I'll tell you about this tomorrow, Mary, " said Tom.