Предмет: Физика, автор: zhaksylyk2013

Железнодорожный вагон массой 20 т, скатываясь с сортировочной горки со скоростью 0,3 м/с, сталкивается с неподвижным вагоном массой 25 т. Какова скорость вагонов после автосцепки?

Ответы

Автор ответа: Physicist0

2

Дано:
m=20*10^3 кг
u=0,3 м/с
М=25*10^3 кг
u'-?
Решение.
Запишем закон сохранения импульса.
m1u0+M2u2=m1u1+M2u'
Теперь перепишем для нашей ситуации,учитывая,что масса будет общая после сцепки и равна будет m'=(m1+M)
m1u1=(M+m1)u'
u'=m1u1/m1+M
u'=20*10^3*0,3/20*10^3+25*10^3=0,133 м/с.
Ответ:0,133

saloev: Импульс P=m*v-основная формула ;

Physicist0: я знаю,но тут нам нужен закон сохранения импульса

saloev: m1*v1=(m1+m2)*v2

Physicist0: чувак я решал также как пишешь сейчасты

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Русский язык, автор: УдарникДен

Сочинение рассуждение на тему если бы у меня не было интернета (180 слов)

1 год назад

Предмет: Английский язык, автор: лиза4854884483

Помогите решить все задания буду очень благодарна

1 год назад

Предмет: Английский язык, автор: Anastasia310795

переведите текст. Our University Perm State Humanitarian Pedagogical University is the oldest higher school of this type in the Urals. It was founded in 1921 and the number of students was small. During the next years our University grew greatly. Nowadays a great number of students enter every year its thirteen faculties: the Faculty of Mathematics, of Philology, of Physical Culture, of Primary Schooling, of Psychology and Pedagogy of Childhood, of Natural Sciences, of History, of Information Technology and Economics and others. In five buildings of the University there are a lot of facilities: lecture halls, computer classrooms, research laboratories, a rich library, some readingrooms, a big conference hall. The staff of professors and lecturers is great and includes many outstanding scientists who make a contribution to their fields of knowledge. Pedagogical University provides higher education for future teachers. There are full-time students, part-time students and external students at our University. Part-time and external students combine work and learning. Many full-time students and postgraduates are provided with hostel accommodations and receive state grants. The course of studies for future Bachelors lasts 4 or 5 years; some students can study another 2 years to earn a Master's degree. The academic year begins in September and ends in July. Each academic year has two terms and at the end of each term students take credit-tests and terminal examinations in different subjects. There are many subjects on the curriculum: Pedagogy, Psychology, Philosophy, Foreign language, History of Russia, etc. Students attend lectures and seminars. They are also engaged in scientific work and write their research papers. All students have teaching practice at a number of schools and kindergartens in Perm. At the end of the course of study students take final examinations and submit a graduation paper. 1.2. Определите, являются ли следующие утверждения а) истинными; б) ложными; в) не содержатся в тексте. Используйте фразы “It’s right”, “It’s wrong”, “There is no information”. a) Perm State Humanitarian Pedagogical University is the oldest higher school in the Urals. b) There are 13 faculties at the University nowadays. c) The Faculty of Physics, of Natural Sciences, of Information Technology and Economics are housed in the main building. d) Our University provides higher education for future engineers. e) Full-time students usually combine work and learning. f) The course of studies for future Bachelors lasts six years. g) Students take credit-tests and terminal examinations twice a year. 1.3. Запишите понятие, которое объясняется в дефиниции. a) the method of teaching when students listen to a professor and write down; b) students who combine work and learning; c) the place where books and other literary materials are kept; d) a sum of money to finance educational study; e) the testing of knowledge of students without giving any definite mark; f) a period in which a break is taken from studies for rest, travel, or recreation; g) the method of teaching when students in small groups discuss with a professor theories and exchange information; h) any of the divisions of the academic year at the University.

1 год назад

Предмет: Математика, автор: Аноним

Математика
5 класс
Перевести эти единицы в современные.
1 дюйм = 2 см 5 мм
1 фут = 12 дюймов =30 см
1 ярд = 3 фунта = 90 см
1 миля = 1609 м

7 лет назад

Предмет: Химия, автор: mancityu17p141f2

какой объем водорода выделится при растворении 15 г цинка в избытке соляной кислоты?

7 лет назад