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Консультация № 191405
30.09.2017, 16:47
0.00 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:Движущаяся по гладкой горизонтальной поверхности
шайба налетает на покоящуюся шайбу. После абсолютно упругого центрального удара шайбы движутся в противоположных направлениях со
скоростями, отличающимися по абсолютной величине в n=5 раз.
Найдите отношение k=M/m масс покоившейся и налетающей шайб.
шайба налетает на покоящуюся шайбу. После абсолютно упругого центрального удара шайбы движутся в противоположных направлениях со
скоростями, отличающимися по абсолютной величине в n=5 раз.
Найдите отношение k=M/m масс покоившейся и налетающей шайб.
Обсуждение
05.10.2017, 17:47
общий
это ответ
Здравствуйте, 12kim!
Пусть
и 
- скорости налетающей шайбы до удара и после удара соответственно, 
- скорость покоящейся шайбы после удара. Примем направление движения налетающей шайбы до удара за положительное направление оси. В проекциях на эту ось, в соответствии с законом сохранения импульса, получим
По закону сохранения кинетической энергии
Разделив
на 
получим
Подставив
в получим
Если
то 
тогда из 
получим
Если
то 
тогда из получим
Пусть
и - скорости налетающей шайбы до удара и после удара соответственно, - скорость покоящейся шайбы после удара. Примем направление движения налетающей шайбы до удара за положительное направление оси. В проекциях на эту ось, в соответствии с законом сохранения импульса, получимПо закону сохранения кинетической энергии
Разделив
на получимПодставив
в получимЕсли
то тогда из получимЕсли
то тогда из получим
Об авторе:
Facta loquuntur.
Facta loquuntur.
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