Một con lắc lò xo gồm lò xo có khối lượng không đáng kể, có độ cứng  (N/m) gắn với quả cầu có khối lượng m, Cho quả cầu dao động với biên độ 5 (cm). Động năng của quả cầu ở vị trí ứng với li độ 3 (cm) là?

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Một số câu hỏi khác có thể bạn quan tâm.

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

  Everyone knows that smoking effects your health.

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

  Either parents are able to sign the form.

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

  photos               social                    another                     broke

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

  introduce                   solution                    honor                     computer

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

  early                 near                   hear                     appear

• Choose the best answer for the following sentence:

  My little son! It’s time you ______________________ to bed.

   

• Choose the best answer for the following sentence:

  Either spring_________ summer is a good time to visit our region.

   

• Choose the best answer for the following sentence:

  The woman ______________ I told you works in our school.
  
  

• Choose the best answer for the following sentence:

  Pam is the friend ________ she lives.
  
  

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

  Fiona has a beautiful voice and plays the guitar very well.