Предмет: Физика, автор: katehappiest

Импульс тела.Импульс силы.Закон сохранения импульсов. Нужна полная информация по этой теме.

Ответы

Автор ответа: Felix1234
5
Импульс тела это физическая векторная величина равная произведению массы тела на его скорость
Импульс силы обусловлен ускорением или воздействием силы

stark07: Импульс тела. Закон сохранения импульса. Реактивное движение
Импульс силы и импульс тела
Как было показано, второй закон Ньютона может быть записан в виде

Ft=mv-mvo=p-po=Dp.
Векторную величину Ft, равную произведению силы на время ее действия, называют импульсом силы. Векторную величину р=mv, равную произведению массы тела на его скорость, называют импульсом тела.

В СИ за единицу импульса принят импульс тела массой 1 кг, движущегося со скоростью 1 м/с, т.е. единицей импульса является килограм
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Предмет: Английский язык, автор: salievaelina
Помогите пожайлуста Выберите правильные предлоги:

1. Let’s translate this article … Russian
a. in b. into c. on
2. Let’s listen…the latest news.
a. for b. into c. in
3. He gets …the institute by bus.
a. to b. into c. in
4. He is free… Mondays
a. on b. in c. at
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a. in b. at c. on


Выберите правильные обстоятельства:



6. I haven’t finished my drawing…
a. yet b. just c. already
7. I have… been to London
a. never b. since c. now
8. She has… painted the picture.
a. yet b. just c. already
Выберите вспомогательный глагол:

9. … he meet us at the station tomorrow?
a. will b. does c. is
10. … you finished writing your article yet?
a. were b. did c. have
11. What magazine… you looking through when we came into the hall?
a. did b. were c. are
12. This problem… discussed at our last meeting.
a. will be b. was c. had
13. When …they come back?
a. did b. have c. were
14. …it still raining? Yes, it is.
a. is b. does c. will
15. …your sister want to buy a new television?
a. has b. is c. does






Выберите правильную форму глагола:

16. Oh, I am sorry. I didn’t … you at first.
a. understanding b. understood c. understand
17. He was so tired that he couldn’t …us.
a. to join b. joined c. join
18. Have you written the letter yet?- No, I haven’t. I…still…it.
a. have written b. am writing c. was writing
19. Did she… her plan last month?
a. fulfills b. fulfill c. fulfilled
20. Does your son … to watch TV?
a. likes b. liked c. like
21. My father… home at 5 o’clock yesterday.
a. was coming b. has come c. came
22. At 5 o’clock I … to the news on the radio.
a. was listening b. listened c. have listened
Какой вспомогательный глагол следует употребить для образования вопросительной формы?

a. do b. did c. does d. had
23. We played football yesterday.
24. They had to stay at home.
25. These workers combine work and studies.
26. He goes on business to St.Petersburg.
Выберите английские эквиваленты для слов, стоящих в скобках:

27. Foreign languages (изучаются) by the students.
a. have learnt b. are learnt c. are learning
28. (Умеете) you play tennis?
a. must b. can c. may
29. I (не смогу) to help you.
a. shall not allowed b. shall not be able c. shall not have
30. They(должны были) to take part in the competition.
a. must be b. had c. had to be
31. He(сможет) go skiing.
a. will have to b. will allow c. will be able to
32. We (пришлось) to stay at home because it was raining.
a. were able to b. had to c. could
33. Do you speak(какой-нибудь) foreign language?
a. some b. any c. something
34. (Все) knows him.
a. everything b. somebody c. everybody
35. Did(кто-нибудь) ring me up?
a. somebody b. anybody c. anything




36. This project is the(самый лучший) in our group.
a. better b. best c. worst
37. This flat(менее) comfortable than ours.
a. worse b. least c. less
38. The 21st of June is the(самый длинный) day in the year.
a. warmer b. longer c. longest
39. Did you hear(что-нибудь) ?
a. everything b. something c. anything
40. He did not tell me (ничего).
a. nothing b. something c. anything
41. He rang(никому) up.
a. anybody b. nobody c. somebody
42. (Их) work is not interesting.
a. them b. theirs c. their
43. I can’t see(их).
a. them b. they c. their
44. I live in this house. There is a bus stop in front of (ним).
a. him b. it c. its
45. I have not met(его) sister.
a. his b. him c. its
46. I don’t hear(его).
a. him b. his c. he


Найдите синонимы или определения к указанным словам:



47. usually( a. as a rule b. seldom c. often)
48. to continue(a. to make pleasant b. to go on c. to enjoy)
49. to arrive( a. to come b. to visit c. to introduce)
50. to receive (a. to get b. to divide c. to depend)
51. recently( a. a year ago b. not long ago c. some time later)
52. to watch(a. to get interested b. to look attentively c. to devote)
53. to leave( a. to attend b. to come in c. to go away)


Выберите пары слов- антонимов:

54. a. famous-unknown b. outstanding-good c. thick-white
55. a. to make progress- to forget b.to get light-to get dark c. to be born-to live
56. a. far-near b. happy-favourite c. to dance-to sing
57. a. to be well -to be untidy b. to ask-to answer c. to be glad-to be free
58. a. to read- to agree b. to miss classes-to attend classes c. to translate-to repeat
59. a. to make-to do b. a lot of-few, little c. to combine-to miss
60. a. to learn-to forget b. to do-to finish c. to ask-to discus