-
Очень срочно!
візок масою 80 кг рухається зі швидкістю 1,5 м/с. спортсмен масою 60 кг біжить назустріч візкові зі швидкістю 5 м/с. визначити швидкість візка після того, як спортсмен застриюнув на нього.
Ответы 1
-
Начальная сумма импульсов:M*V - m*v = 80*1,5 - 60*5 = -180 кг*м/сКонечный импульс:(M+m)*U = (80+60)*U = 140*UПриравниваем:140*U = - 180 U = - 180 / 140 ≈ -1,3 м/с (тележка движется в противоположном начальному направлению)
-
Автор:
aishaweeks - 6 лет назад
-
0
-
-
Добавить свой ответ
Еще вопросы
-
сколько будет 25х10х6х10~2(в минус второй степени)
помогите пожалуйста) -
придумай и запиши опорные слова для высказывания о том где можно найти информацию о путешествии информацию можно найти? 5 слов
-
Предмет:
Литература -
Автор:
kaylynnbarron676 - 6 лет назад
-
Ответов:
1 -
Смотреть
-
-
с=СРОЧНО
1.Какой вид изображения представлен на рисунке? Выберите один ответ: развертка чертеж аксонометрическая проекция план
2.Формулировка задачи может быть....
Выберите один или несколько ответов:
открытой
производтвенной
условной
закрытой
-
Предмет:
Другие предметы -
Автор:
belenhaley - 6 лет назад
-
Ответов:
1 -
Смотреть
-
-
Поставить F или Т
Less than two hundred years ago, no one ever dreamed there was such a thing as dinosaur. Today, everyone knows about dinosaurs. They are especially popular with children. Even young children who can barely write their own names are often familiar with such dinosaur names as Tyrannosaurus, Stegosaurus, and Triceratops.
People have known of dinosaurs for only about 150 years. Before then, no one dreamed there had ever been such creatures. The word “ dinosaur” didn’t even exist.
Anyone who chanced to dig up a fossil dinosaur bone or tooth might have thought it had come from an elephant – or perhaps from a dragon or giant! There were few if any people who could look at a bone and tell what sort of animal it had come from.
But by 150 years ago there were a good many scientists who could examine a bone or a tooth and tell exactly what kind of animal it had come from. Some of these man were very interested in the fossil remains of ancient animals. And they began to discover a number of fossils that they knew had come from reptiles – scaly skinned creatures such as lizards, snakes and crocodiles. But most reptiles of today are rather small, and these fossil reptile bones and teeth were enormous!
In a book written in 1824, an Englishman named William Buckland described a huge fossil jaw that had been dug up near an English town. He called this creature Megalosaurus, which means “ giant lizard ”. It was the first dinosaur to be named. During the next few years, fossils of other ancient reptiles were found and named. Scientists now realized that a great many different kinds of giant reptiles must have lived long ago. A name was needed for these reptiles, just as there is a name for every other group of animals that are alike. In 1841, the English scientist Richard Owen suggested these huge, terrible-seeming reptiles should be called dinosaurs. The word was made up from Greek words “deinos “, which means “terrible”, and sauros”, which means “lizard”. As it turned out, this really wasn’t good name, because dinosaurs were not lizards.
1) People have known of dinosaurs for about 150 years.
2) Three hundred years ago there were few people who could tell what sort of animal the bones belonged to.
3) By 150 years ago the scientists learned to tell exactly what kind of animal it had come from.
4) The first dinosaur to be named was Triceratops.
5) William Buckland was the first man to name the creature Megalosaurus.
6) The word “dinosaur” was suggested by Richard Owen
7)The name "dinosaur" meant "terrrible lizard"?-
Предмет:
Английский язык -
Автор:
foster21 - 6 лет назад
-
Ответов:
1 -
Смотреть
-
Топ пользователей
-
Fedoseewa27
35934 -
Askold
2792 -
Pikachu
2228 -
hobbesbowers
2116 -
kaylynnbarron676
1818 -
女fei
1240 -
yulia-kaplina
1158 -
Poinntt
946 -
Bars
930 -
Queenmagic18
770
How much to ban the user?
1 hour
1 day
100 years