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Консультация № 165778
24.04.2009, 21:18
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Здраствуйте уважаемые эксперты прошу вашей помощи!
Задача Два конькобежца массами 80 и 50 кг, держась за концы длинного натянутого, неподвижно стоят на льду один против другого. Один из них начинает укорачивать шнур, выбирая его со скоростью 1 м/с. С какими скоростями будут двигаться по льду конькобежцы. Трением пренибречь
Задача Два конькобежца массами 80 и 50 кг, держась за концы длинного натянутого, неподвижно стоят на льду один против другого. Один из них начинает укорачивать шнур, выбирая его со скоростью 1 м/с. С какими скоростями будут двигаться по льду конькобежцы. Трением пренибречь
Обсуждение
Неизвестный
24.04.2009, 23:52
общий
это ответ
Здравствуйте, Mihenze!
v1 + v2 = 1 м/с;
Используем закон сохранения импульса: 0 = m1v1 + m2v2 - здесь скорости имеют разные знаки, так как направлены в противоположные стороны. Знак "-" мы опустим, так как он нам не очень нужен.
m1v1 = m2v2;
v1 = m2v2/m1;
v1 = 80v2/50;
v1 = 1,6v2;
v1 + v2 = 1 => 2,6v2 = 1 => v2 = 0,385 м/с; v1 = 0,615 м/с.
v1 + v2 = 1 м/с;
Используем закон сохранения импульса: 0 = m1v1 + m2v2 - здесь скорости имеют разные знаки, так как направлены в противоположные стороны. Знак "-" мы опустим, так как он нам не очень нужен.
m1v1 = m2v2;
v1 = m2v2/m1;
v1 = 80v2/50;
v1 = 1,6v2;
v1 + v2 = 1 => 2,6v2 = 1 => v2 = 0,385 м/с; v1 = 0,615 м/с.
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