Một con lắc lò xo gồm vật nhỏ và lò xo nhẹ có độ cứng k, đang dao động điều hòa. Chọn mốc thế năng tại vị trí cân bằng. Khi chất điểm có li độ x thì thế năng của nó là ?

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  schoolbag                   decide                   replace                  escape

• Choose the best answer for the following sentence:

  In Hamlet, the opening scene ____________ place at night.

   

• Choose the best answer for the following sentence:

  John ______________ his first piece of music when he was ten years old.

   

• Choose the best answer for the following sentence:

  While Mai ____________ the meal, her brother _____________the house. 

   

• Choose the best answer for the following sentence:

  When I ______________ home, my parents _______________ to work.

   

• Choose the best answer for the following sentence:

  I ______________ this hat only once since I _______________ it.

   

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

  I haven't seen this kind of hat before.

   

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

  He read a newspaper during breakfast.

   

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

  year                  near                 wear                  gear

• Choose a word that has different stress pattern:

  celebrate                   refreshment                        restaurant                     relative