Ответ по предмету Физика: При каких условиях за непрозрачным телом наблюдается одна тень с нечёткими границами?

Предмет: Химия, автор: Аноним

К 10 г 5%-го раствора нитрата бария добавили 10 г 5%-го раствора серной кислоты.Определите массу образовавшегося осадка.

7 лет назад

Предмет: Математика, автор: playmakvin

а) найдите 15% числа 36.
б) найдите число, 15% которого равны 36.
И напишите решение пожалуйста.

7 лет назад

Предмет: Английский язык, автор: akerke09563

ПОМОГИТЕЕ СРОЧНО ПЛИИЗ
1. The University of Bologna __since 1167

a) have been

b) has been

c) was

d) be

e) is

2. Many famous people __ from Bologna especially in law and science.

a) have graduated

b) has graduated

c) graduates

d) graduated

e) graduates

3. John Bruce __three million euros in a lottery

a) has won

b) won

c) win

d) was winning

e) wins

4. Let`s go out. The rain __

a) stopped

b) has stopped

c) stops

d) stop

e) will stop

5. __the train stopped, all the passengers got off.

a) While

b) When

c) As

d) Then

e ) During

6. I didn`t interrupt him because he __ to the teacher.

a) were speaking

b) was speaking

c) spoke

d) is speaking

e ) speaks

7. What __ Tom`s wife __ when she heard the news?

a) are / saying

b) was /saying

c) has /said

d) did/say

e) is/saying

8. His friend never ¬__ by train again.

a) travelled

b) didn`t travel

c) was travelling

d) is travelling

e ) did travel

9. As he ¬¬¬__down the street, he __ a voice in his head

a) was walking /was hearing

b) was walking/heard

c) is walking/heard

d) has walked/ were hearing

e) walked/heard

10. When she got home, she __ dinner.

a) was making

b) had made

c) made

d) has made

e) makes

11. After the teacher finished, the students __ some questions.

a) were asking

b) asked

c) are asking

d) have asked

e) did ask

12. Max __ his car to work when it happened.

a) was driving

b) is driving

c) drives

d) drove

e) driven

13. While we __ for the bus, it started to rain.

a) were waiting

b) are waiting

c) waited

d) wait

e) is waiting

14. When I got home, my mom and dad__ coffee in the kitchen.

a) are having

b) were having

c) had

d) have

e ) had had

15. I__a student for two years.

a) am

b) have been

c) was

d) were

e) was been

16. Obama __ a president in 2009

a) became

b) become

c) has become

d) is becoming

e) becomes

17. I don`t have enough time for __ computer games.

a) have played

b) was playing

c) is playing

d) playing

e) played

18. The greenhouse__ is an increase in the amount of carbon dioxide.

a) effect

b) protection

c) pollution

d) recycle

e ) environment

19. The energy generated by the __ is both very efficient.

a) windmill

b) protection

c) pollution

d) recycle

e) environment

20. The Japanese __ more than half their waste paper.

a) deforestation

b) gases

c) pollution

d) recycle

e) environment

21. The most important problem is gradual __ of the surface of the Earth.

a) pollution

b) warming

c) deforestationв

d) gases

e) dust

22. Climate change and human activities, such as intensive agriculture and industry, are two main causes of ___.

a) pollution

b) warming

c) deforestation

d) gases

e) dust

23. I’ve drunk milk every ___ day of my life, and it’s never done me any harm.

a) single

b) one

c) particular

d) individual

e) good

24. I like Mary for her friendly smile and her ___ of humour.

a) manner

b) sense

c) way

d) impression

e) feelings

25. The wonderful smell of freshly ___ coffee hit us as we entered the store.

a) smashed

b) pressed

c) ground

d) crushed

e) done

26. I really hope you can find a __ to this problem.

a) result

b) solution

c) conclusion

d) way

e) answer

27. Sleep and rest are incredibly __ for your well-being

a) health

b) important

c) good

d) enough

e) much

28. Young people typically __ at least 8 hours of sleep a night to feel and function well..

a) want

b) see

c) need

d) know

e) show

29. Good sleep __learning, concentration and memory.

a) improves

b) shows

c) takes

d) feels

e) drives

30. We often feel ¬¬__ when we eat too much food that is not healthy for us.

a) sick

b) happy

c) surprised

d) responsible

e) well

31. You need to learn how to __ care of yourself.

a) make

b) do

c) take

d) have

e ) get

32 . There are a lot of things you need to do to take care __ yourself.

a) of

b) after

c) about

d) on

e) with

33. As we grow, we have to use our experience about the world to keep ourselves __ .

a) silent

b) away

c) occupied

d) clean

e) safe

34. You cannot ¬¬¬¬__ more than a few days without food or water.

a) go

b) sleep

c) survive

d) walk

e) take

35. You should ¬¬¬¬__ things such as too much caffeine or sugar

a) do

b) survive

c) produce

d) organize

e) avoid

36. There is even evidence that exercise makes our brains __ more efficiently too!

a) walk

b) live

c) do

d) work

e) have

37. I tried to __ in the dictionary.

a) look after

b) look at

c) look back

d) look up

e) look for

38. He __ the dog with interest

a) look after

b) look at

c) look back

d) look up

e) look for

39. Angie doesn’t like to__ on her past. She keeps her on the future.

a) look after

b) look at

c) look back

d) look up

e) look for

40. I am waiting __ you at the station

a) at

b) about

c) for

d) after

e) to

7 лет назад

Предмет: Геометрия, автор: Джека0

найдите величину двугранного угла при основании правильной четырёхугольной пирамиды, если её боковые рёбра наклонены к плоскости основания под углом 60◦

10 лет назад

Предмет: Геометрия, автор: Джека0

Найдите высоту правильной треугольной пирамиды, у которой боковая поверхность = 60√3 см², а полная поверхность = 108 √3см².

10 лет назад

При каких условиях за непрозрачным телом наблюдается одна тень с нечёткими границами?

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