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Консультация № 196178
22.08.2019, 11:40
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
К телу массой m = 5 кг, первоначально покоившемуся на горизонтальной поверхности, прикладывают горизонтальную силу. Найдите проекцию vx (t )
скорости тела в момент времени =10 с в следующих
случаях:
а) поверхность гладкая, сила не изменяется со временем, её величина равна
F =20H,
направление действия силы неизменно;
б) поверхность шероховатая, коэффициент трения скольжения тела по поверхности равен = 0,4,
величина силы равномерно растёт со временем по закону
F=a* t , a=4Н/с,
направление действия силы неизменно.
Положительное направление оси OX совпадает с направлением действия силы. Ускорение свободного падения 2
g =10 м/с .
К телу массой m = 5 кг, первоначально покоившемуся на горизонтальной поверхности, прикладывают горизонтальную силу. Найдите проекцию vx (t )
скорости тела в момент времени =10 с в следующих
случаях:
а) поверхность гладкая, сила не изменяется со временем, её величина равна
F =20H,
направление действия силы неизменно;
б) поверхность шероховатая, коэффициент трения скольжения тела по поверхности равен = 0,4,
величина силы равномерно растёт со временем по закону
F=a* t , a=4Н/с,
направление действия силы неизменно.
Положительное направление оси OX совпадает с направлением действия силы. Ускорение свободного падения 2
g =10 м/с .
Обсуждение
24.08.2019, 10:24
общий
09.08.2021, 18:46
это ответ
Здравствуйте, irinasoboleva76!
В соответствии со вторым законом Ньютона имеем следующее:
а)
(м/с);
б)
(м/с).
Здесь
(с) -- момент времени, в который тело начнёт двигаться. В этот момент горизонтальная сила, действующая на тело, становится равной по величине максимальной силе трения покоя.
Литература
Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
В соответствии со вторым законом Ньютона имеем следующее:
а)
(м/с);б)
(м/с).Здесь
(с) -- момент времени, в который тело начнёт двигаться. В этот момент горизонтальная сила, действующая на тело, становится равной по величине максимальной силе трения покоя.Литература
Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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