Một con lắc lò xo dao động điều hoà theo phương thẳng đứng với tần số góc = 20rad/s tại vị trí có gia tốc trọng trường g = 10m/s², khi qua vị trí x = 2cm, vật có vận tốc v = 40cm/s. Lực đàn hồi cực tiểu của lò xo trong quá trình dao động có độ lớn         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  “Diana is a wonderful ballet dancer.” “She ______________ since she was four.”
   

• Choose the best answer for the following sentence:

  “What a beautiful dress you’re wearing!” “Thank you. It ___________ especially for me by a French tailor.”
   

• Choose the best answer for the following sentence:

  Edward was new on the job, but he quickly fit himself into the _____________ routine of the office.
   

• Choose the best answer for the following sentence:

  The Mayan Indians ____________ an accurate and sophisticated calendar more than seven centuries ago.
  
  

• Choose the best answer for the following sentence:

  When I woke up and looked outside, the landscape had changed. The ground had been lightly ___________ with a dusting of snow during the night.
   

• Choose the best answer for the following sentence:

  We can’t even walk in the storm. Let’s wait in the hallway where we’ll be ____________ the strong winds until things quiet down.
   

• Choose the best answer for the following sentence:

  Last night a tornado swept through Rockville. It ___________ everything in its path.
   

• Choose the best answer for the following sentence:

  Be sure to wash the vegetables thoroughly. A lot of pesticides residue _____________ on unwashed produce.
   

• Choose the best answer for the following sentence:

  Dynamite __________ by Alfred Bernard Nobel.
   

• Choose the best answer for the following sentence:

  This exercise may __________ with a pencil.