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Цилиндрическое тело объемом 0,04 м³ плавает в воде погрузившись на половину своего объема. Если на Данное тело положить шарик, то под водой будет находится 3/4 всего объема цилиндра. Определить массу шарика.
Ответы 1
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Дано:
Объем цилиндра V = 0,04 м³
Половина объема цилиндра погружена в воду, то есть Vпогр = 0,5V
Плотность воды ρв = 1000 кг/м³
Решение:
Согласно закону Архимеда, сила Архимеда равна весу вытесненной жидкости. То есть, Fарх = mвg = ρвVпогрг, где mв - масса вытесненной воды, g - ускорение свободного падения.
Масса цилиндра mц = Fарх / g = ρвVпогр = 1000 * 0,02 = 20 кг.
Когда на цилиндр кладут шарик, под водой находится 3/4 объема цилиндра. Значит, Vпогр’ = (3/4)V.
Следовательно, масса цилиндра и шарика вместе mц+ш = Fарх’ / g = ρвVпогр’ = 1000 * 0,03 = 30 кг.
Масса шарика mш = mц+ш - mц = 30 - 20 = 10 кг.
Ответ: Масса шарика равна 10 кг.
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Автор:
lil girlhahq - 1 год назад
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7. The Mad Tea Party
Alice looked around and saw the Cheshire Cat in a tree, with a big smile on its face.
“Excuse me,” she said, “can you tell me which way to go?"
“Where do you want to get to?" asked the cat.
“I don't know,” said Alice. “Where can I go?”
“A Hatter lives over there,” said the cat. He pointed one way. “And a March Hare lives over there." He pointed the other way. “You can visit either of them. They’re both mad."
“I don’t want to visit mad people," said Alice.
“Well, I’m sorry,” said the cat, "but we’re all mad here! I’m mad. You’re mad. Goodbye!"
The cat slowly disappeared, starting with its tail, until Alice could only see its smile.
“I’m going to visit the March Hare,” Alice said, and she walked through the wood until she came to the March Hare’s house.
When she saw the house, Alice knew* she was in the right place. There was fur on the roof, and the chimneys looked like long ears.
There was a long table under a tree in the March Hare's garden. The Hatter and the March Hare were at the table. There was a Dormouse between them. It was fast asleep.
Alice sat in one of the chairs. “Hello!" said the March Hare. “Have some lemonade!”
Alice looked at the table. There wasn’t any lemonade. There was only tea.
“I can’t see any lemonade," she said.
“There isn’t any,” said the March Hare.
"Then it was rude to offer it to me," said Alice.
"It was rude to sit down at my table,” said the March Hare. “I didn't invite you.”
“There are plenty of chairs." said Alice.
Nobody spoke* for a few minutes. Then the Hatter asked, "What day of the month is it?”
“It's the fourth,” said Alice.
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“It was very good butter," said the March Hare.
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"Of course not!” said the Hatter. “Does your watch tell you what year it is?"
“No,” said Alice, "because the year stays the same for a long time.”
“Exactly!” said the Hatter. “Now, I want a clean cup! Let’s all move round the table!”
They all moved to the next seat. Now Alice had a dirty cup in front of her.
"I don’t think she said.
"Then don’t talk!" said the Hatter.
Alice was so angry that she walked away from the table. “What a stupid tea party!" she said.
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5.Where do you think Alice is going to go now?
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