Предмет: Физика, автор: Alinchik7980

определите давление керосина на дно цистерны, если уровень керосина в цистерне 2м. Плотность керосина 800кг/м3

Ответы

Автор ответа: ruskalimullin
0
определите давление керосина на дно цистерны, если уровень керосина в цистерне 2м. Плотность керосина 800кг/м3
Автор ответа: ruskalimullin
0
По формуле давления:
р=po*g*h. ( p-давление, ро - плотность жидкости (керосина=800кг/куб. м.) , h-высота столба=2м, g -ускорение свободного падения=10м/c^2).
р=800*10*2=16000Па. (16кПа).
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Write the correct verb forms and explain your choice (Present Simple, Present Continuous, Past Simple).

1. They (watch) TV at the moment.
2. My mum __ (not cook) dinner last night.
3. What your sister (to do) every Sunday? – She (to meet) with her friends.
4. She (write) letters to her mother every week.
5. I (go) to bed at ten o'clock yesterday.  
6. You (interrupt) me. I hate it.
7. I __ (walk) to school because there weren't any buses.
8. They __ (not dance) at the party.
9. My brother __ (travel) to Ireland last summer.
10. Where your uncle (to work)? – He (to work) at school.
11. He usually (to sleep) well. But last night he (to sleep) badly.
12. Your friend (to do) his homework now?
13. You (to get) up early on Sunday? – Yes. But last Sunday I (to sleep) till ten o’clock.
14. I __ (lose) my watch in the park.
15. How many lessons you (to have) every day?
16. Your brother (to be) a teacher? – Yes, he (to become) a teacher two years ago.
17. Father (sit) on the sofa now.
18. Listen. The telephone (ring).
19. I (be) a student, I (study) at the University.
20. When you (to leave) the office yesterday?
21. His brother (to come) yesterday? – No, he (not to come). He (to be busy).
22. Look at Tom. He (ride) a horse.
23. Tom (not play) computer games yesterday.
24. Her father (not to watch) TV at the moment. He (to sleep) because he (to be) tired.
25. He often (watch) birds in autumn.
26. Don’t ask me now. I (write) an exercise.
27. She (to be) ill now. She (to eat) an ice-cream yesterday.
28. My sister (not to play) the piano now. She (to play) the piano in the evening.
29. I (to sit) in the waiting room at the dentist’s now.
30. My father (not to work) at the shop.