Предмет: Физика, автор: Ivan1321

Звук от источника до поверхности идет за 5с через какое время его услышат акволангист под водой на глубине 3м

Ответы

Автор ответа: Аноним

Скорость звука в воде (приблизительно):
V = 1500 м/с
Время распространения звука в воде:
t = S/V = 3/1500 ≈0,002 с

Общее время:
5 + 0,002 = 5,002 с

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Математика, автор: vigirl2021

Отрезок длины 9,5 см разделён на 5 равных частей. Найди расстояние между серединами крайних частей.СРОЧНО

6 лет назад

Предмет: Русский язык, автор: savre7

405. Подумайте, какие виды орфограмм вы не встретили в текстах предыдущих
упражнений? Создайте сводную таблицу «Орфограммы с буквами ь иЪ». Для этого
изучите приложение «Виды изученных орфограмм в конце учебника.
Орфограммы с буквами ьи
Наименование орфограммы
No
Примеры
1
2

6 лет назад

Предмет: Английский язык, автор: Heiton4ik

Graham: Oh, I fell asleep. Where are we?
Barbara: We're almost there.
Graham: No, no. I want it to look out of the window to see all the places we flew over. Why didn't you wake me up?
Barbara: You looked very tired. So I didn't want to,
Graham: I was asleep for over three hours. What can you see out of the window now?
Barbara: It looks like desert below, but I think we are near Los Angeles. We went over the Rockies a short time ago. The mountains were absolutely beautiful.
Graham: I can't believe I missed that. I really wanted to see the Rockies.
Barbara: Sorry, Graham. You can sit next to the window when we fly back to New York.
Graham: Thanks. Did you have something to eat? I know you were hungry.
Barbara: Yes. About an hour ago I ate chicken and rice. There was also a dessert, but it had pear in it. So I didn't touch it.
Graham: I'm really hungry now, too. I didn't have any breakfast this morning, either.
Barbara: We can buy something for you. When we get to the airport, you don't like chicken anyway. And the alternative was Spanish omelet, which looked disgusting.
Graham: What other things did you see out of the window? Did you see Chicago and the great legs?
Barbara: Yes, we flew right over Chicago. I could see little boats on the Lake. It was wonderful.
Graham: I can't believe I was sleeping. And I had a dream about flying too.
Barbara: They showed a great movie too. You know the one about Brad Pitt being the manager of the chocolate factory.
Graham: That's not Brad Pitt in that movie. I like that film too. I think we're starting to land.
Barbara: Yes, we aren't so high now. What are we going to do? When we get to Los Angeles,
Graham: We have to make a phone call to your father don't way.
Barbara: Right? Then let's go straight to the hotel to sleep. I'm exhausted.

Match the speakers to their words and write G for Graham and B for Barbara in front of each statement.
1. I couldn’t see the Rocky Mountains because I fell asleep. ……[1]
2. I ate chicken and rice for dinner. ……[1]
3. I saw Great Lakes of Chicago out of the window. ……[1]
4. I watched a Brad Pitt movie. ……[1]
5. Let’s call your father first. ……[1]
[5]

Reading. 2
Task 2. Read the text about the World Cup and decide whether each statement 1–5 is true or false. Write T(True) or F(False) in front of each statement.

Football World Cup
Every four years, in a different country around the world, there is a big sports competition, the FIFA World Cup. It is like Olympics but only for one sport. I think it is the most popular sport in the world!
The first World Cup was in 1930, in Uruguay. In the final game Uruguay beat Argentina and became the first World Cup winners. Thirteen countries played in the first World Cup. Now there are a variety of countries in the competition.
The first time people saw the World Cup on TV was in 1954 when Switzerland held the competition. Now about 3 billion people in countries all over the world watch the World Cup on TV.
Brazil is the most successful World Cup team. They are the only team that have played in every tournament. They have won it five times. Germany and Italy have both won 4 times. Argentina and Uruguay have won it two times. Do you know the results of England, France and Spain?
1. The football is similar to Olympics but it relates to one sport. ……[1]
2. Football is the most popular sport throughout the world. ……[1]
3. Now there are only several countries in the competition ……[1]
4. Germany is the luckiest country among all World Cup teams. ……[1]
5. Brazil’s team has taken part in every tournament. ……[1]

{5}

Writing 1
Task 3. Write a report about the holiday trip you remember.
Write at least 60-70 words in 2 paragraphs.

• where you went
• what place you stayed at
• how long was your holiday trip
• how you travelled
• what you enjoyed doing

[5]

Writing 2
Task 4. Thinking and write down answers on the questions.

1) Do you like any kinds of sports? What kind of sports can you play?
2) What sport is easy for you to play? Why?
3) What weird sports do you know? Why would you like to try it?
4) Is playing or doing sports good for you? Why?
5) Do you like to celebrate holidays with your family or with your friends? Why?

Можете пж помоч у меня СОЧ

6 лет назад

Предмет: Математика, автор: mamontova175

в загородном лагере за 3 летних месяца отдохнуло 700ребят. из них в июне 220 человек, а в июле 180. поставь вопрос и реши задачу

9 лет назад

Предмет: Биология, автор: olgamini163

1.По каким признакам классифицируют науки о животных?
2.Почему охранять животных и заботиться об их видовом многообразии должен каждый человек на Земле ?

9 лет назад