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Консультация № 189890
16.10.2016, 16:53
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Здравствуйте! У меня возникли сложности с таким вопросом ( 4 ) :
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Обсуждение
17.10.2016, 10:22
общий
Адресаты:
Попробуйте сначала вывести формулу для силы давления на ось блока.
Об авторе:
Facta loquuntur.
Facta loquuntur.
17.10.2016, 17:02
общий
это ответ
Здравствуйте, anton74551!
"Вчерне" решение такое.
Рассмотрим движение груза массой
На него действуют сила тяжести 
направленная вниз, и сила натяжения нити 
направленная вверх. Груз при этом движется вниз с ускорением 
В проекции на ось, направленную вверх, получим
Аналогично для груза массой
Вычитая из равенства
равенство 
получим
Тогда, согласно уравнению
На невесомый блок действуют три силы: реакция
опоры оси, направленная вверх, и силы натяжения левой и правой ветвей нити 
Для блока
Блок действует на левое плечо рычажных весов с силой
направленной вниз и равной по величине
Вычислим разность между силами, действующими на левое и правое плечи рычажных весов:
Разность получилась отрицательной. Значит, при расторможенном блоке на правое плечо рычажных весов действует сила бОльшая, чем на левое. Поэтому чашка весов будет опускаться. Чтобы восстановить равновесие весов, нужно снять с чашки груз весом, равным абсолютной величине полученной разности.
"Вчерне" решение такое.
Рассмотрим движение груза массой
На него действуют сила тяжести направленная вниз, и сила натяжения нити направленная вверх. Груз при этом движется вниз с ускорением В проекции на ось, направленную вверх, получимАналогично для груза массой
Вычитая из равенства
равенство получимТогда, согласно уравнению
На невесомый блок действуют три силы: реакция
опоры оси, направленная вверх, и силы натяжения левой и правой ветвей нити Для блокаБлок действует на левое плечо рычажных весов с силой
направленной вниз и равной по величинеВычислим разность между силами, действующими на левое и правое плечи рычажных весов:
Разность получилась отрицательной. Значит, при расторможенном блоке на правое плечо рычажных весов действует сила бОльшая, чем на левое. Поэтому чашка весов будет опускаться. Чтобы восстановить равновесие весов, нужно снять с чашки груз весом, равным абсолютной величине полученной разности.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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