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Консультация № 196457
26.09.2019, 21:04
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Здравствуйте! Прошу помощи в следующем вопросе:
На железнодорожном сортировочном узле вагон массой m1=60т, движущийся по прямолинейному горизонтальному пути, догоняет другой вагон массой m2=40т, и сцепляется с ним. В результате абсолютного неупругого столкновения механическая энергия вагонов уменьшается на Q=10кДж. Найдите расстояние d между вагонами за время T=2c перед сцепкой? Действие сил трения считайте пренебрежимо малыми.
На железнодорожном сортировочном узле вагон массой m1=60т, движущийся по прямолинейному горизонтальному пути, догоняет другой вагон массой m2=40т, и сцепляется с ним. В результате абсолютного неупругого столкновения механическая энергия вагонов уменьшается на Q=10кДж. Найдите расстояние d между вагонами за время T=2c перед сцепкой? Действие сил трения считайте пренебрежимо малыми.
Обсуждение
27.09.2019, 20:09
общий
это ответ
Здравствуйте, Алексей!
Пусть
-- соответственно скорости вагонов с массами 
до удара, 
-- скорость сцепки вагонов с массой 
после удара. По закону сохранения импульса имеем 
откуда получим, что 
Кинетическая энергия вагонов до удара составляет 
кинетическая энергия сцепки вагонов после удара составляет 
Их разность составляет
-- скорость сближения вагонов до удара;
(м)
-- искомое расстояние.
Литература
Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Пусть
-- соответственно скорости вагонов с массами до удара, -- скорость сцепки вагонов с массой после удара. По закону сохранения импульса имеем откуда получим, что Кинетическая энергия вагонов до удара составляет кинетическая энергия сцепки вагонов после удара составляет Их разность составляет-- скорость сближения вагонов до удара;
(м)-- искомое расстояние.
Литература
Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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