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Консультация № 199330
15.10.2020, 22:23
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Здравствуйте! У меня возникли сложности с таким вопросом:
Через блок перекинута нить, на конце которой прикреплен груз массой 1 кг. Радиус блока 10 см. Рассчитать момент силы, действующей на блок, если груз опускается на нити с ускорением 2 м/с2.
a) 0,8 Нм. b) 1,0 Нм. c) 0,5 Нм. d) 2,0 Нм.
Через блок перекинута нить, на конце которой прикреплен груз массой 1 кг. Радиус блока 10 см. Рассчитать момент силы, действующей на блок, если груз опускается на нити с ускорением 2 м/с2.
a) 0,8 Нм. b) 1,0 Нм. c) 0,5 Нм. d) 2,0 Нм.
Обсуждение
20.10.2020, 22:21
общий
это ответ
Здравствуйте, alekseyslobodyanyuk20003!
По 2 закону Ньютона, на груз действуют силы mg и Т в противоположные стороны
в проекции на ось х
имеем
mg-T=ma - здесь Т - сила натяжения нити, под действием которой раскручивается диск
Тогда
Т=m(g-a) = 8 Н
Тогда момент силы Т, действующей на диск
М=Т*R = 0,8 Н*м
Удачи
По 2 закону Ньютона, на груз действуют силы mg и Т в противоположные стороны
в проекции на ось х
имеем
mg-T=ma - здесь Т - сила натяжения нити, под действием которой раскручивается диск
Тогда
Т=m(g-a) = 8 Н
Тогда момент силы Т, действующей на диск
М=Т*R = 0,8 Н*м
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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