Ban đầu, người ta dùng một giá đỡ giữ vật ở vị trí lò xo không biến dạng. Cho giá đỡ chuyển động xuống dưới với gia tốc a = 2(m/s²). Tính biên độ dao động của vật. Lấy g = 10(m/s²).

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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:

  endangered                     threatened                      recovered                    advanced

• Choose the best answer for the following sentence:

  People have hunted animals ___________ food, hides, and ivory.
   

• Choose the best answer for the following sentence:

  The number of the world’s elephants is restricted ____________ some certain countries.
   

• Choose the best answer for the following sentence:

  A _____________ punishment is necessary to prevent poaching and cutting trees illegally.
   

• Choose the best answer for the following sentence:

  ____________ passenger pigeon, one of several species of extinct birds, was hunted
  to extinction over _____________ few decades.
   

• Choose the best answer for the following sentence:

  Since the 1600s, humans have rapidly increased _____________ rate of extinction because of population growth and resource consumption.
   

• Choose the best answer for the following sentence:

  Today, most of ___________ world’s habitats are changing faster than most spe-cies can evolve, or adapt to such changes.
   

• Choose the best answer for the following sentence:

  We need ____________ actions and interventions of the local authorities to prevent national parks from being destroyed by pollution.
   

• Choose the best answer for the following sentence:

  There was no scientific evidence that the catastrophic _______________ in Britain’s song-birds was due to the unwelcome attention of birds of prey.
   

• Choose the best answer for the following sentence:

  ______________ weapons have made more contribution to poaching and killing wild animals.