Hai con lắc đơn có chiều dài hơn kém nhau 30 cm. Trong khoảng thời gian Δt, con lắc thứ nhất thực hiện được 20 dao động toàn phần thì con lắc thứ hai thực hiện được 40 dao động toàn phần. Chiều dài của con lắc thứ nhất là :

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  competition                          delegation                          energetic                       successfully

• Choose a word that has different stress pattern:

  milkmaid                         rival                        title                           defend

• Choose a word that has different stress pattern:

  overwhelming                                participant                                facility                                 development

• Choose a word that has different stress pattern:

  solidarity                               determination                             personality                            agricultural

• Choose the best answer for the following sentence:

  Mr. Jackson was famous for his ________________ a change in the world tennis law.
  
  

• Choose the best answer for the following sentence:

  I admire the _____________ of the disabled to work his way through the sport training school.
  
  

• Choose the best answer for the following sentence:

  Even a professional footballer sometimes finds it hard to kick a ball into the ______________ net.
  
  

• Choose the best answer for the following sentence:

  The Vietnam football team and the Thai team have always _____________ been in the recent Sea Games.
  
  

• Choose the best answer for the following sentence:

  As other _________________ supporting the host team, we cheered and shouted when the team scored a goal.
   

• Choose the best answer for the following sentence:

  The young athlete was prevented from the match as the police found a ______________ of drugs hidden in his bags before the match began.