A. $2,0 cm$ .                      

A. gia tốc biến đổi điều hòa sớm pha $\frac{\pi }{2}$  với vận tốc.

B. gia tốc biến đổi điều hòa ngược pha với vận tốc.

A. vị trí biên dương $(x=A)$ .                              

_______ her homework, she read her favorite book.

A. Having been finished

___________, they will have moved to another village.

A. When the police will arrive to help

A. biên độ; tần số; gia tốc.                                   

A. Quy tắc bàn tay trái.                                        

Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following queétions.

Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions.

A. expect B. attend C. behave D. wonder

A. Phụ thuộc vào khối lượng vật nhỏ.

B. Phụ thuộc vào gia tốc trọng trường nơi làm thí nghiệm.                      

A. chiều dài lò xo tại vị trí cân bằng.                   

A. tỉ lệ với bình phương biên độ và luôn hướng về vị trí biên.

B. tỉ lệ với độ lớn của li độ và luôn hướng về vị trí cân bằng.

We had reached the top of the mountain. We realized how far we had come.

A. No sooner had we reached the top of the mountain than we realized how far we had come.

B. Scarcely we had reached the top of the mountain did we realize how far we had come.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

David is unemployed, so he can't book this flight by himself.

A. Provided David were unemployed, he could book this flight by himself.

B. David could book this flight by himself if he were unemployed.

It's six years since I last went abroad.

A. I didn't go abroad six years ago.

Tom said, "I'll give you this book back tomorrow, Mary."

A. Tom said to Mary that she will give him that book back the next day.

B. Tom told Mary that he would give her that book back the next day.