Предмет: Физика, автор: miyocfletcher122

Задача 1. Плотность спирта 0,8 г/см3. Какова будет высота столба спирта при давлении 2,4 кПа?
Задача 2. Рассчитайте давление оказываемое клеем на дно банки, в которой он содержится, если известно, что плотность клея 1500 кг/ м3. Высота банки 9 см.
Задача 3. Определите высоту столба воды, который уравновешивается атмосферным давлением 700 мм рт. ст..
Задача 4. Определите высоту горы, если у ее подножия барометр показывает давление 780 мм рт. ст., а на ее вершине — 610 мм рт. ст.
Задача 5*. В U – образную трубку налили сначала ртуть. Затем в левое колено была налита вода, а в правое – масло. Известно, что высота столба воды – 85 см, а уровень ртути в правом колене на 2,5 см выше, чем в левом. Какова высота столба масла?

Ответы

Автор ответа: Summerhill
1
Задача 1.

Дано:

ро=0,8 г/см^3

p=2,4 кПа

g=10 Н/кг

Найти:

h-?

СИ: 2400 Па; 800 кг/м^3

Формулы: р=роgh=} h=p/(po×g)

Решение:

1)h=2400 Па/(800 кг/м^3×10 Н/кг)=0,3м

Задача 2.

Дано:

ро=1500 кг/м^3

h=9 см

g=10 Н/кг

Найти:

p-?

СИ: 0,09 м

Формулы: p=pogh

Решение:

1)p=pogh=} 1500 кг/м^3×10 Н/кг×0,09 м=1350 Па

Задача 3.

Дано:

pатм.=700 мм рт.ст

g=10 Н/кг

ро=1000 кг/м^3

Найти:

h-?

СИ:

Формулы: р=роgh=} h=p/(po×g)

Решение:

1)р=роgh=} h=p/(po×g)= 700 мм рт.ст/(1000 кг/м^3×10 Н/кг)=0,07 м

Задача 4

Дано:

р1=780 мм рт.ст

р2=610 мм рт.ст

∆h=12 м ∆p=1 мм рт.ст

Найти:

h.горы-?

Формулы: ∆h=12 м ∆p=1 мм рт.ст

Решение:

1) 780 мм рт.ст - 610 мм рт.ст= 170 мм рт.ст

2) 12 м.×170 мм рт.ст=2040 м

Задача 5.

Дано:

hводы=85 см

hртути в правом колене на 2,5 см выше, чем в левом.

ро.ртути=13600 кг/м^3

ро.масла=900 кг/м^3

СИ: 0,85 м; 0,025 м

Решение:

h.масла=10^3×0,85-13600×0,025/900=0,57м=57см
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Economy wasted trip



An Englishman who was in France wanted to go back to England by sea. But he

had very little money. He had so little money that he could pay only for the ticket. As he

knew that the trip would last only two days, he decided not to eat during these days.

As he took a ticket and got on the ship the next morning, he tried not to hear the

bell for breakfast. When dinner time came, he was very hungry; but he didn’t go to the

dining-room. In the evening he was still more hungry, but when the waiter came to

invite him to have supper, the Englishman said that he was ill.

The next day the Englishman was half-dead and couldn’t stand the hunger any

longer. “I shall go and eat even if they kick me out into the sea”, said he to himself. So

he went to the ship dining-room and had his dinner. In the evening he had supper but

was very much afraid of his future because he didn’t pay for the meals. At last he

addressed the waiter and said: “Bring me the bill, please”. – “What bill?” asked the

waiter. – “For the supper and dinner I had in your dining-room”. – “Don’t trouble, Sir.

You paid for your meals when you bought the ticket”.

I. Choose the correct variant (a,b or c).

1) The Englishman wanted to go back to England...

a. by air

b. by sea

c. by car

2) The Englishman decided not to go to the dining-room because...

a. he wasn’t hungry

b. he cooked meals himself

c. he had no money to pay for meals

3) When the waiter came to invite him to have supper...

a. the Englishman said that he was ill

b. the Englishman pretended that he was sleeping

c. the Englishman didn’t answer

4) The Englishman was afraid of his future because…

a. the meals were bad

b. he didn’t pay for the meals

c. the storm had begun

II. Mark the statements: True or False.

1. The Englishman had very little money. _____

2. The Englishman wasn’t hungry during the journey. ______

3. The next day the Englishman went to the dining-room to have dinner. ______

4. The Englishman had to pay for the meals. ______