Một con lắc đơn có chiều dài dây treo ℓ = 45 cm, khối lượng vật nặng là m = 100 g. Con lắc dao động tại nơi có gia tốc trọng trường g = 10 m/s². Khi con lắc đi qua vị trí cân bằng, lực căng dây treo bằng 3 N. Tốc độ của vật nặng khi nó đi qua vị trí này là:      

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  If I _____________ a car, I would drive to work.
  
  

• Choose the best answer for the following sentence:

  You ___________ life much easier if you smile more often.
  
  

• Choose the best answer for the following sentence:

  If you ____________ as I told you, you would have succeeded.
  
  

• Choose the word that has the underlined part pronounced differently from the rest: 

  box                    hospital                      local                        shop 

• Choose the word whose stress is on the third syllable:

  picturesque                     industrial                     paragraph                      Internet

• Choose the best answer for the following sentence:

  Our house is right in the country. There are plenty of nice places to walk in the _____ area.
  
  

• Choose the best answer for the following sentence:

  It wasn’t I who stole the jewels. You’ve made a ___________ mistake.
  
  

• Choose the best answer for the following sentence:

  I couldn’t decide between the two records, so I bought ____________ of them.
  
  

• Choose the best answer for the following sentence:

  Have you told ____________ about the letter?
  
  

• Choose the best answer for the following sentence:

  I would never borrow money from ____________ .