Một vật dao động điều hòa với phương trình x = 6cos4πt (cm), gia tốc của vật thời điểm t = 5 s là:

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Một số câu hỏi khác có thể bạn quan tâm.

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

  cloud                 found                     would                    around

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

  town                    bowl                     how                       cow

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

  group                      couch                         mouse                    house

• Choose a word that has different stress pattern:

  technical                    introduce                      villager                   family

• Choose the best answer for the following sentence:

  She demanded that she ___________ allowed to meet her son in prison.
   

• Choose the best answer for the following sentence:

  __________ if you take the map with you.
    

• Choose the best answer for the following sentence:

  Don't worry. You _________ told if there's a change of the plan.
   

• Choose the best answer for the following sentence:

  There has been an accident on the motorway, ___________ long delays.
   

• Choose the best answer for the following sentence:

  The house is ________ need of a thorough clean.
   

• Choose the best answer for the following sentence:

  After a lot of difficulty, he ____________ to open the door.