Предмет: Физика, автор: ivan6574

Площадь листа железа 1m^2, толщина 1 мм, масса 7.8 кг. Определить плотность железа

Ответы

Автор ответа: DedStar

Ответ:

Объяснение:

Дано:

S = 1 м²

h = 1 мм = 1·10⁻³ м

m = 7,8 кг

_______________

ρ - ?

1) Рассчитаем объем железного листа:

V = S·h = 1·1·10⁻³ = 1·10⁻³ м³

Плотность железа:

ρ = m / V

ρ = 7,8 / (1·10⁻³) = 7 800 кг/м³

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TASK 1
Установите соответствие между темами A-E и текстами 1-4 и занесите свои ответы в таблицу. Используйте каждую букву только один раз. В задании одна тема лишняя.
A. The vitamin makes you happy.
B. Tastes differ.
C. You can’t live without food.
D. Different ways of getting the vitamin.
E. Vitamins and the ABC.
Healthy Food
1. Eating is fun, especially when you are hungry. Most people have a favourite food. Some people enjoy eating sweet things like cakes, chocolates and ice cream. Other people enjoy savoury foods like cheese and meet. Enjoying eating is our body’s way of making sure that is gets the things it needs to work properly.

2. Food helps us to keep warm, talk, run and do all the other things we do. It helps us to grow and stay healthy.

3. Vitamins also help us to be healthy. Scientists name vitamins after the alphabet. All of them are very important, for example: vitamin C keeps our skin and gums healthy. It is found in fresh fruit and green vegetables, such as oranges, blackcurrants, lettuce. Brussels sprouts and spinach also contain a lot of vitamin C.

4. Vitamin D helps our bones to grow strong and hard, and we are able to make it for ourselves if our skin gets enough sunlight. But we can also get vitamin D if we eat fish, milk, butter, cheese and margarine. Some people buy pills and tablets containing vitamins. But most of us get more than enough of them from our food.

TASK 2.
Преобразуйте слова, напечатанные заглавными буквами в конце предложений, так чтобы они
грамматически соответствовали содержанию предложения.
1. This _______ was born in the 17-th century. WRITE
2. Tom’s _______ is nice. DECORATE
3. We read ________ information yesterday. USE
4. The book is difficult to read. It is _______. EASY
5. The weather is _______ today. SUN

TASK 3.
Выберите из трех предложенных вариантов один правильный.
1. My friends … at the airport yesterday.
a) were b) was c) have been
2. I just … a ticket to London.
a) bought b) have bought c) did buy
3. He … to Paris next week.
a) have flown b) has flown c) will fly
4. You … it this year.
a) did b) have done c) has did
5. Look! It … .
a) snows b) is snowing c) snowed