Математический маятник длиной 2,45 метра совершил 100 колебаний за 314 секунд. Каково ускорение свободного падения в этом месте?

Заранее большое спасибо)  

 

 

реши уравнения и сделай проверку а)62-(116+ч):5+34=34 б) 540:(а*3-60)=6

Собственная скорость катера равна 20,4 км.ч, скорость течения реки 3,2 км.ч. Когда катер прошел по течению реки 2,5 часа , до пристани осталось еще 16,3 км.. Сколько километров проплыл катер до пристани?

Complete the sentences as in the example.

(he/see)

-has he seen her?

-Yes, he has seen her. He saw her a minute ago.

1. (he / come) -....................................................................................

-Yes, he .......................................... . He .................................... an hour ago.

2. (she / read)

-........................................................ the book?

-Yes, I ............................ the book. I .......................................... it two days ago.

3. (she / translete)

-.......................................... the text?

-Yes, she ................ the text. She .......................... it ten menutes ago.

4. (they / meet)

- ......................................... the teacher? 

-Yes, they ............................ the teacher. They ................................. him five minutes ago.

5. (he / build)

-........................................... a bridge?

-Yes, he.............................. a bridge. He ............................................... it ten minutes ago.

6. (they / have) -.................................... lunch?

- Yes, they ........................................ lunch. They ............................. lunch ten minutes ago.

7. (the taxi / come)

- ............................................................ ?

- Yes, it .............................................. . It ........................................................ a minute ago.

8. ( he / see)

- .................................................. Red Square?

- Yes, he ..................................................... Red Square. He ............................................................... it two days ago.

9.( the lesson / begin)

- ..........................................................

- Yes, the lesson .................................. . It ........................ five minutes ago.

10. (it / drink)

- ................................................. the milk?

- Yes, it ...................... the milk. It .............................................. the milk two minutes ago.