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Консультация № 185841
17.04.2012, 09:14
76.16 руб.
0
3
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Большая и маленькая лодка массой m1=2.0*1000 kg и m2=0.5*1000 kg, плывут вдоль прямой в одном направлении.
В момент когда лодки приблизились, с большой лодки на маленькую было сброшено тело массой m3=100 kg.
В результате, маленькая лодка остановилась, скорость большой изменилось до v1=2.0 m/s, направление осталось прежним.
Изначальная скорость маленькой лодки была v20=1.2 m/s.
Если не учитывать силу сопротивления воды, найти изначальную скорость большой лодки.
Большая и маленькая лодка массой m1=2.0*1000 kg и m2=0.5*1000 kg, плывут вдоль прямой в одном направлении.
В момент когда лодки приблизились, с большой лодки на маленькую было сброшено тело массой m3=100 kg.
В результате, маленькая лодка остановилась, скорость большой изменилось до v1=2.0 m/s, направление осталось прежним.
Изначальная скорость маленькой лодки была v20=1.2 m/s.
Если не учитывать силу сопротивления воды, найти изначальную скорость большой лодки.
Обсуждение
17.04.2012, 11:05
общий
это ответ
Здравствуйте, Arman Muratuly!
Снова воспользуемся законом сохранения импульса: суммарный импульс системы не меняется, т.е.
.
Откуда выражаем искомую начальную скорость первой лодки:
м/c.
Снова воспользуемся законом сохранения импульса: суммарный импульс системы не меняется, т.е.
.Откуда выражаем искомую начальную скорость первой лодки:
м/c.
17.04.2012, 12:18
общий
Условие задачи допускает неоднозначную трактовку, потому что не указано, что следует понимать под массой 
большой лодки: массу собственно лодки или массу лодки вместе с телом.
В первом случае, согласно закону сохранения импульса механической системы получаем
Во втором случае получаем
большой лодки: массу собственно лодки или массу лодки вместе с телом.В первом случае, согласно закону сохранения импульса механической системы получаем
Во втором случае получаем
Об авторе:
Facta loquuntur.
Facta loquuntur.
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