Предмет: Физика, автор: sabr1nka17

На какую высоту может выпрыгнуть из воды дельфин, если его скорость в воде равна 36 км/ч?

Ответы

Автор ответа: koliaver

v=10 м/с => mv^2/2 = mgh ; h = v^2/2g; h = 5 (м)
Ответ: 5 м. (Ого, это считай до начала 3 этажа в некоторых зданиях...))

sabr1nka17: Большое спасибо тебе!!

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Read the text to find out what the man was and why he came to the house next door only at night.

Ron Lake lived in a rather small house in a wide street, leading to the river. It was their city's main street and Ron's house wasn't far from the bridge. If the windows were open at night, when everything was dark and quiet, he could hear many dilferent sounds from the river. One dark night Ron couldn't sleep and he couldn't understand why, He heard noises but they were not usual, He woke up his two brothers, Sid and Alan, because he was afraid. "What has happened?" asked Sid. "It's night and everybody is in bed." "Look over there," said Ron. The boys came to the windows. "Look at the honse near the church, " said Ron. The boys looked at the lhouse and couldn't believe their eyes. There was light in it. "Oh, dear" sald Sid. "Nobody has lived in this house for a long time!" "I have never seen anyone there either," said Alan "Who could it be?" asked Sid, "There is a burglar there!" said Ron. Suddenly the house became dark. "Watch the doors!" said Sid. A man came out the back door. "Look! Here he is. He must be a burglar or maybe a spy!" said Alan. The man came to the traffic lights, turned left and then the boys couldn't see him any more. "We can't catch him now," said Ron."Let's go to the house Omortow. The next day the boys went to the house. Both the front door and he back door were locked. Everything seemed all right. They ouldn't hear a thing. They looked through the window. There was no- dy in The boys watched the house for some time and then went home. Al night when it got dark the boys saw a fall man in the street. He walked up to the house and went in. "I don't think he is burg lar, Sid said. "He has got a key to the hofse." "Maybe he is ispy," said Ron. "Let's go and see what he is doing." The boys walked up to fthe house. They could see thaf the fire was already yat ning in one of the rooms, and that there was a big box on the ate table But fhe boys couldn't see the man. "What shall we to asked Alan Suddenly they saw a log next to the road. The boys put it up against the wall, below the window, but when Alan began to climb he fell down and there was a loud noise. The door opened and they saw the man, and the man saw the boys. "Who are you?" he asked. "Do you live near here?" "Yes, we do," answered Sid. "And what about you?" The man smiled. "I think that I'm your neighbour. My name is Mr Collins. I am an arehitect. I have bought this house. My family is going to live here after their trip to Scotiand. But I want to finish some things in the house and build some things in the garden, so I come here after work." "That sounds great," said the boys. "We hope we'll see a lnt of you. Well, goodbye." "I'm sure you wilf. Goodbye, boys," said Mr Collins and he shut the door. The children started laughing as they waiked back to their house. "A burglarf" said Ron. "A spy!" smiled Sid. "I wonder if le has a son of my age," said Ron. "We could become friends."

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