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Консультация № 196308
04.09.2019, 13:55
0.00 руб.
1
1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Под действием силы тяжести mg груза и силы F рычаг, показанный на рисунке, находится в равновесии. Вектор силы F перпендикулярен рычагу. Расстояния между точками приложения сил и точкой опоры, а также проекции этих расстояний на вертикальную и горизонтальную оси указаны на рисунке. Если модуль силы тяжести, действующей на груз, равен 1500 Н, то модуль силы F ⃗ равен:
1) 240 Н
2) 360 Н
3) 6000 Н
4) 7500 Н
Под действием силы тяжести mg груза и силы F рычаг, показанный на рисунке, находится в равновесии. Вектор силы F перпендикулярен рычагу. Расстояния между точками приложения сил и точкой опоры, а также проекции этих расстояний на вертикальную и горизонтальную оси указаны на рисунке. Если модуль силы тяжести, действующей на груз, равен 1500 Н, то модуль силы F ⃗ равен:
1) 240 Н
2) 360 Н
3) 6000 Н
4) 7500 Н
Прикрепленные файлы:
Обсуждение
07.09.2019, 10:02
общий
это ответ
Здравствуйте, dar777!
В общем случае, помимо указанных в условии задачи сил, на рычаг действуют реакции горизонтальной поверхности, на которую опирается левый конец рычага, и опоры (точки тела вращения). Реакция опоры не создаёт момента относительно этой опоры. Если предположить, что реакция горизонтальной поверхности равна нулю (левый конец рычага приподнят над горизонтальной поверхностью), то одно из условий равновесия рычага имеет следующий вид [1, с. 84]:
откуда получим, что
(Н).
Если же нормальная реакция горизонтальной поверхности не равна нулю, то имеющихся данных, по-моему, недостаточно для решения задачи.
Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
В общем случае, помимо указанных в условии задачи сил, на рычаг действуют реакции горизонтальной поверхности, на которую опирается левый конец рычага, и опоры (точки тела вращения). Реакция опоры не создаёт момента относительно этой опоры. Если предположить, что реакция горизонтальной поверхности равна нулю (левый конец рычага приподнят над горизонтальной поверхностью), то одно из условий равновесия рычага имеет следующий вид [1, с. 84]:
откуда получим, что
(Н).Если же нормальная реакция горизонтальной поверхности не равна нулю, то имеющихся данных, по-моему, недостаточно для решения задачи.
Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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