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ДАМ 25 БАЛІВ! За допомогою важеля піднімають вантаж вагою 200 Н на висоту 1 м. При цьому сила, прикладена до другого плеча важеля, виконала роботу 3 кДж. Визначте ККД важеля
Ответы 1
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Ответ:
Объяснение:
η=F*h / A = 200*1 / (3000)=0.067*100% =6.7 %
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Автор:
esther23 - 5 лет назад
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Test 6
1. When the light ... I was sitting in the armchair reading a book.
a) goes out c) go out
b) had gone out d) went out
2. I thought I ... this film before, but I hadn't.
a) saw c) had seen
b) seen d) have seen
3. Why haven't you brought me the letters for signature? ... them yet?
a) Don't you type c) Haven't you typed
b) Didn't you type d) Will you type
4. She wasn't sure whether she ... the door of her flat.
a) locked c) had locked
b) has locked d) didn't lock
5.1... my homework all morning and haven't finished it yet.
a) am doing c) have been doing
b) do d) did
6. The inspector suspected that the thief ... a special key for opening this door.
a) uses c) had used
b) has used d) will use
7. I was very tired. When I ... to bed, I fell asleep immediately.
a) got c) had got
b) has got d) will get
8. The Vikings ... to North America a thousand years ago.
a) sail c) had sailed
b) sailed d) have sailed
9. Thank you for your offer, but I ... not to accept it.
a) decide c) have decided
b) has decided d) decided
10. You ... through your old photograph album for half an hour already.
a) look c) have looked
b) are looking d) have been looking
11. Nobody knows where his picture is. Perhaps, it ... .
a) was stolen c) has been stolen
b) will be stolen d) stolen
12. I agree. You ... apologize for not inviting him to your birthday party.
a) can't c) shouldn't
b) mustn't d) may not
13. Actually, today I feel ... than I did yesterday.
a) bad c) worst
b) worse d) the worst
14. ... people who are unemployed often feel depressed.
a) The с) А
b) - d) That
15. Who was the first astronaut who landed on ... Moon?
a) the с) а
b) - d) those
16. What happened at the end of the film? - I'm sorry to say, but I haven't seen ... film.
a) a c) -
b) the d) those
17. This is ... interesting exhibition I've ever visited.
a) more c) less
b) most d) the most
18. Would you mind waiting ... minutes?
a) few c) little
b) a few d) a little
19. I'm ... interested in languages than in mathematics,
a) much c) little
b) many d) less
20. The students often translate English texts ... Russian.
a) to c) into
b)in d) on
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