Tại một nơi trên mặt đất, một con lắc đơn dao động điều hòa với chu kì 2s. Nếu chiều dài con lắc giảm đi 4 lần thì chu kì dao động của con lắc lúc này là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  ____________ people go to football matches now' than twenty years ago.
   

• Find a mistake in the four underlined parts of the sentence and correct it:

  My friend is still optimistic however many difficulties she has to overcome.

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

  Would you mind waiting outside the office?
  
  

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

  sperm                   percentage                      fertilizer                      diversity
  
  

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

  actual                               individual                            careful                          casual

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

  concern                            conserve                     water                 prefer 

• Choose a word that has different stress pattern:

  condition                habitat                       accident                 paragraph

• Choose a word that has different stress pattern:

  follow                        complete                            release                         increase

• Choose a word that has different stress pattern:

  seafood                         pollute                          mammal                       proper 

• Choose the correct sentence which is built from the words and phrases given:

  5 June 1911, Ho Chi Minh / leave / Vietnam / a French steamer / work / a kitchen helper / 
  find out the way / free / own country //.