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Консультация № 201387
07.09.2021, 15:17
0.00 руб.
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Здравствуйте! Прошу помощи в следующем вопросе:
Три длинные доски с массами m, 2m и 3m покоились (одна на другой, сложенные «стопкой», — см. рисунок) на гладкой горизонтальной поверхности. По «средней» доске нанесли резкий удар, сообщив ей скорость 3 м/с, направленную точно вдоль досок. Коэффициент трения между верхней доской и средней равен 0,3, а коэффициент трения между средней доской и нижней равен 0,2.
1) Через какое время после удара проскальзывание досок друг по другу полностью прекратится?
2) Какой станет скорость досок после этого?
Три длинные доски с массами m, 2m и 3m покоились (одна на другой, сложенные «стопкой», — см. рисунок) на гладкой горизонтальной поверхности. По «средней» доске нанесли резкий удар, сообщив ей скорость 3 м/с, направленную точно вдоль досок. Коэффициент трения между верхней доской и средней равен 0,3, а коэффициент трения между средней доской и нижней равен 0,2.
1) Через какое время после удара проскальзывание досок друг по другу полностью прекратится?
2) Какой станет скорость досок после этого?
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