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Консультация № 195801
04.06.2019, 16:34
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1
Здравствуйте! У меня возникли сложности с таким вопросом:
Вагон катится вдоль горизонтального участка дороги. Сила трения составляет 20% от веса вагона. К потолку вагона на нити подвешен шарик массой 10 г. Определить: 1) силу, дей¬ствующую на нить; 2) угол отклонения нити от вертикали. [1) 0,10 Н; 2) 11°35']
Вагон катится вдоль горизонтального участка дороги. Сила трения составляет 20% от веса вагона. К потолку вагона на нити подвешен шарик массой 10 г. Определить: 1) силу, дей¬ствующую на нить; 2) угол отклонения нити от вертикали. [1) 0,10 Н; 2) 11°35']
Обсуждение
05.06.2019, 10:44
общий
это ответ
Здравствуйте, dar777!
Под действием силы трения, направленной в сторону, противоположную направлению движения вагона, тот имеет ускорение a, которое тоже направлено в сторону, противоположную направлению движения. В системе отсчёта, связанной с Землёй, на шарик действуют сила тяжести mg и сила T натяжения нити. Их равнодействующая имеет направление ускорения a вагона и имеет абсолютную величину ma=0,2mg. Следовательно,
1) T=[$8730$]((mg)2+(0,2mg)2)=mg[$8730$](1+0,22)=20*10-3*9,81*[$8730$]1,04[$8776$]0,20 (Н) (сила, действующая на нить, равна по величине силе натяжения нити);
2) [$945$]=arctg(0,2mg/(mg))=arctg(0,2)[$8776$]11[$186$]19'.
Под действием силы трения, направленной в сторону, противоположную направлению движения вагона, тот имеет ускорение a, которое тоже направлено в сторону, противоположную направлению движения. В системе отсчёта, связанной с Землёй, на шарик действуют сила тяжести mg и сила T натяжения нити. Их равнодействующая имеет направление ускорения a вагона и имеет абсолютную величину ma=0,2mg. Следовательно,
1) T=[$8730$]((mg)2+(0,2mg)2)=mg[$8730$](1+0,22)=20*10-3*9,81*[$8730$]1,04[$8776$]0,20 (Н) (сила, действующая на нить, равна по величине силе натяжения нити);
2) [$945$]=arctg(0,2mg/(mg))=arctg(0,2)[$8776$]11[$186$]19'.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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