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Здравствуйте, уважаемые эксперты! Прошу вас помочь с задачками :
3. Шар массой m1 = 2 кг движется со скоростью v1 = 3 м/с и сталкивается с шаром массой 4 кг, движущимся ему навстречу со скоростью v2 = 4 м/с. Определить скорости шаров после прямого центрального удара. Удар считать абсолютно упругим.
5. Шарик массой 20 г подвешен на нерастяжимой нити. На какой минимальный угол надо отклонить шарик, чтобы при дальнейшем движении нить оборвалась, если максимально возможная сила натяжения нити равна 0.3 Н?
9. Два одинаковых металлических заряженных шара находятся на расстоянии r = 50см. Сила отталкивания шаров F1 = 100 мкН. После того как шары привели в соприкосновение и удалили друг от друга на прежнее расстояние, сила отталкивания возросла и стала равной F2 = 200 мкН . Вычислить заряды Q1 и Q2, которые были на шарах до их соприкосновения. Диаметр шаров считать много меньшим расстояния между ними.
3. Шар массой m1 = 2 кг движется со скоростью v1 = 3 м/с и сталкивается с шаром массой 4 кг, движущимся ему навстречу со скоростью v2 = 4 м/с. Определить скорости шаров после прямого центрального удара. Удар считать абсолютно упругим.
По закону сохранения импульса
или
а по закону сохранения кинетической энергии
или
причём
что после деления уравнения на уравнение даёт
Приравняв выражения и одно к другому, получим
(м/с) -- скорость первого шара после удара,
(м/с) -- скорость второго шара после удара.
4
Жаль, что только одна задачка((
Об авторе:
Facta loquuntur.
Форма ответа
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matyuhina_aleksa 
на уравнение 
даёт
и 
одно к другому, получим
(м/с) -- скорость первого шара после удара,
(м/с) -- скорость второго шара после удара.