Tại một nơi, chu kỳ dao động điều hòa của một con lắc đơn là 2,0 s. Sau khi tăng chiều dài của con lắc thêm 21 cm thì chu kỳ dao động điều hòa của nó là 2,2 s. Chiều dài ban đầu của con lắc này là

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Một số câu hỏi khác có thể bạn quan tâm.

• Remember to ........... your shoes when you come to a Japanese house.

• To Americans, it is impolite to ask someone about age, ___________ and salary

• Choose the correct answer. She tried her best to ............. a family of five on her own.

• This year Hue festival ,,,,,,,,,,,,,,,,,,,,,,,,thousands of tuorists from many countries in the world.

• In some Asian countries, the groom and bride …….. their wedding rings in front of the altar.

• She must have been sleepless last night. Otherwise, her eyes........... so bloody now.

• ....... that we had to ask a police officer for directions.

• ......... at his lessons, he couldn't catch up with his classmates.

• She must have been sleepless last night. Otherwise, her eyes........... so bloody now.

• Some researchers have just ___ a survey of young people’s points of view on contractual marriage.