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Консультация № 186596
11.09.2012, 13:46
0.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Зависимость пройденного телом пути от времени задается уравнением S(t)=4+t2. Определить величину силы F, действующей на тело, если коэффициент трения тела о плоскость µ = 0,1, масса тела m=1 кг, а α=300.
Зависимость пройденного телом пути от времени задается уравнением S(t)=4+t2. Определить величину силы F, действующей на тело, если коэффициент трения тела о плоскость µ = 0,1, масса тела m=1 кг, а α=300.
Обсуждение
11.09.2012, 15:43
общий
это ответ
Здравствуйте, Massimo!
Направим ось абсцисс слева направо, а ось ординат снизу вверх. Начало этой неподвижной системы координат отнесём к любой точке, например, к той, в которой находился центр масс тела в начальный момент времени. Тело движется под действием следующих сил: тяжести
направленной вертикально вниз; неизвестной 
направленной соласно рисунку; реакции плоскости 
направленной вертикально вверх; трения 
направленной в сторону убывания абсцисс.
В проекциях на координатные оси второй закон Ньютона для данного тела запишется следующим образом:
откуда находим
Ответ: 3,25 Н.
С уважением.
Направим ось абсцисс слева направо, а ось ординат снизу вверх. Начало этой неподвижной системы координат отнесём к любой точке, например, к той, в которой находился центр масс тела в начальный момент времени. Тело движется под действием следующих сил: тяжести
направленной вертикально вниз; неизвестной направленной соласно рисунку; реакции плоскости направленной вертикально вверх; трения направленной в сторону убывания абсцисс.В проекциях на координатные оси второй закон Ньютона для данного тела запишется следующим образом:
откуда находим
Ответ: 3,25 Н.
С уважением.
5
Большое спасибо!!!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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