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Консультация № 200074
10.01.2021, 13:10
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Шайба лежит на шероховатой доске. Массы доски и шайбы одинаковы, коэффициент трения скольжения шайбы по доске равен 0,3. По шайбе производят удар, действуя горизонтальной силой. После удара шайба движется по доске с начальной скоростью 2,9 м/с.
На какое расстояние переместится доска за время скольжения шайбы по доске? Ускорение свободного падения 10 . Доска находится на гладкой горизонтальной поверхности.
Большое спасибо
Шайба лежит на шероховатой доске. Массы доски и шайбы одинаковы, коэффициент трения скольжения шайбы по доске равен 0,3. По шайбе производят удар, действуя горизонтальной силой. После удара шайба движется по доске с начальной скоростью 2,9 м/с.
На какое расстояние переместится доска за время скольжения шайбы по доске? Ускорение свободного падения 10 . Доска находится на гладкой горизонтальной поверхности.
Большое спасибо
Обсуждение
17.01.2021, 11:43
общий
это ответ
Здравствуйте, maks.zverkov.05!
Пусть в момент удара шайба массой m движется с начальной скоростью v[sub]0[/sub], а в момент её остановки система тел "доска+шайба" общей массой m + m = 2m будет двигаться с некоторой скоростью v. Тогда согласно закону сохранения импульса mv[sub]0[/sub] = 2mv и v = v[sub]0[/sub]/2.
Сила трения, действующая на доску со стороны шайбы, постоянна и пропорциональна весу шайбы:
([$956$] - коэффициент трения). Под действием этой силы доска будет двигаться с постоянным ускорением
и достигнет скорости v, переместившись на расстояние
В данном случае для v[sub]0[/sub] = 2.9 м/с и [$956$] = 0.3 получим
м = 35 см.
Пусть в момент удара шайба массой m движется с начальной скоростью v[sub]0[/sub], а в момент её остановки система тел "доска+шайба" общей массой m + m = 2m будет двигаться с некоторой скоростью v. Тогда согласно закону сохранения импульса mv[sub]0[/sub] = 2mv и v = v[sub]0[/sub]/2.
Сила трения, действующая на доску со стороны шайбы, постоянна и пропорциональна весу шайбы:
([$956$] - коэффициент трения). Под действием этой силы доска будет двигаться с постоянным ускорением
и достигнет скорости v, переместившись на расстояние
В данном случае для v[sub]0[/sub] = 2.9 м/с и [$956$] = 0.3 получим
м = 35 см.
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