Предмет: Физика, автор: skworeshnik

ПОМОГИТЕ ОТДАЮ ПОСЛЕДНИЕ БАЛЛЫ
Рассмотри схему! Выполни необходимые вычисления и заполни таблицу! Ответы округли до десятых! 1 1 проводник 2 проводник На всём участке цепи І. А U.B 40 ROM 5 25
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Приложения:

Ответы

Автор ответа: EmptyStack
1
Найдем сопротивление второго проводника : т.к проводники подключены последовательно, то сопротивление на всем участке цепи равно сумме сопротивлений каждого из проводников , тогда
R_2 = Rобщ - R_1
R_2 = 25 - 5 = 20 Ом
Далее найдем ток в цепи : при последовательном соединении проводников ток, протекающий через каждый из них - одинаковый , тогда по закону Ома :
I_2= U_2/R_2= 2 А
Учитывая вышесказанное получаем :
I_1 = I_2 = I общ = 2 А
Теперь найдем напряжение на каждом из проводников : при последовательном соединении напряжение всей цепи равно сумме напряжений на каждом проводнике , тогда по закону Ома :
U_1 = I_1*R_1 = 2* 5 = 10 В
U общ = U_1 + U_2 = 50 В


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1. Put the verbs in brackets into the correct form of the past simple or the past continuous.

To: Carlos
From: Alex
Hey Carlos,
I 1) was listening (listen) to the news as I 2) .............. (drive) to work and I 3) .................................. (hear) that the mine in your town 4) ............................... (collapse) earlier today. What 5) ............................... (happen)? Why 6) ................................... (the mine/
collapse)? 7) .......................................... (you/work) at the time? I hope people 8) ............................... (not/get) trapped down there. Anyway, please email me as soon as you can so I’ll know that you’re safe and sound. I 9) ..................... (try) to call you earlier, but your line 10) ................... (be) constantly busy.
Alex

2. Put the verbs in brackets into the correct form of the present perfect simple or the present perfect continuous.

1 A: Have the rescuers found (rescuers/find) the missing climbers yet?
B: No, although they ....................................... (look) for the last two days.
2 A: .................................................. (you/seen) the new cooking show on Channel 3?
B: No, I .......................................... (not/have) any free time to watch TV lately.
3 A: The volcanic eruption in Chile ..................... (force) the authorities to evacuate 22 villages.
B: What eruption? I ......................................... (not/hear) anything.
4 A: I ............................................ (try) to get in touch with you all morning.
B: I .................................... (run) around town all day doing some errands.

3. Put the verbs in brackets into the correct form of the present perfect simple, the present perfect continuous or the past simple.

Thanks to my work, I 1) have had (have) the chance to view some truly amazing sights over the years. I 2) ............................... (work) as a freelance nature and wildlife photographer for over two decades, and my job 3) ........................... (take) me to the four corners of the Earth. I 4) ............................. (photograph) everything from strange underwater creatures in the Pacific Ocean to rare bird species in the heart of the Amazon Rainforest. The change in my career 5) ..................... (come about) in 1999, when Mount Etna 6) ........................... (erupt). I was in Sicily visiting friends at the time, and the magnificent sight I 7) ............................. (witness) was the reason why I 8) ......................... (make) the decision to stop photographing animals and landscapes and go after the forces of nature. Since then, I 9) ........................ (shoot) stunning images of the 2004 tsunami disaster in Asia, the 2010 volcanic eruption in Iceland as well as several other events. So far I 10) ......................... (not/have) the opportunity to photograph tornados. It’s next on my list though and sure to be a challenge. Is my work dangerous?
Absolutely! My wife 11) ............................... (ask) me to go back to wildlife photography for the last two years now, because she fears for my safety. But I can’t give up the excitement this kind of photography 12) …..………….......…… (bring) into my life yet!


4. Underline the correct item.

1 Patrick hadn't attended/hadn't been attending a live concert before.
2 Jessica had been lying/had lain in the sun for hours and her skin was starting to go red.
3 Her phone had been ringing/had rung for a few minutes before she finally answered it.
4 John had grown/had been growing a beard and looked really different.
5 They had evacuated/had been evacuating the village hours before the tsunami hit.
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