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Консультация № 112493
05.12.2007, 18:31
0.00 руб.
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1
1
Здравствуйте! У меня очень плохо с физикой (чесно), помогите пожалуйста решить несколько задач:
1)Железнодорожная платформа массой М=20т движется со скоростью V1= 1-9км/ч. Из орудия, установленного на платформе, выпущен снаряд массой mс со скоростью V2=700м/c относительно орудия. Определить скорость платформы после выстрела: 1) когда выстрел произведен в направлении движения платформы; 2) когда выстрел произведен в противоположном направлении. Трением платформы о рельсы пренебречь.
Приложение:
2)Движущийся вдоль своей оси с некоторой скоростью стержень имеет для наблюдателя из лабораторной системы отсчета длину l1=1м. При увеличении скорости тела в 4/3 раза длина стержня стала l2=0,75м. Найти собственную длину стержня.
1)Железнодорожная платформа массой М=20т движется со скоростью V1= 1-9км/ч. Из орудия, установленного на платформе, выпущен снаряд массой mс со скоростью V2=700м/c относительно орудия. Определить скорость платформы после выстрела: 1) когда выстрел произведен в направлении движения платформы; 2) когда выстрел произведен в противоположном направлении. Трением платформы о рельсы пренебречь.
Приложение:
2)Движущийся вдоль своей оси с некоторой скоростью стержень имеет для наблюдателя из лабораторной системы отсчета длину l1=1м. При увеличении скорости тела в 4/3 раза длина стержня стала l2=0,75м. Найти собственную длину стержня.
Обсуждение
Неизвестный
06.12.2007, 19:23
общий
это ответ
Здравствуйте, Margo!
1) Записываем закон сохранения импульса:
V1*(M+m)=V1*(после)*M+-V2*m , отсюда
V1*(после)=(V1*(M+m)-V2*m)/M(для выстрела по направлению движения) и V1(после)=(V1*(M+m)+V2*m)/M для выстрела в противоположную сторону относительно движения.
К сожалению в тексте вопроса не понятно численное значение V1 и массы снаряда, так что посчитайте сами.
1) Записываем закон сохранения импульса:
V1*(M+m)=V1*(после)*M+-V2*m , отсюда
V1*(после)=(V1*(M+m)-V2*m)/M(для выстрела по направлению движения) и V1(после)=(V1*(M+m)+V2*m)/M для выстрела в противоположную сторону относительно движения.
К сожалению в тексте вопроса не понятно численное значение V1 и массы снаряда, так что посчитайте сами.
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