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Консультация № 195921
29.06.2019, 03:20
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Футбольный мяч массой 500 г падает с крыши десятиэтажного дома высотой 30 м. Время падения мяча 2,65 с. Скорость в точке падения 22,6 м/с. Определить среднюю силу сопротивления при движении мяча.
Футбольный мяч массой 500 г падает с крыши десятиэтажного дома высотой 30 м. Время падения мяча 2,65 с. Скорость в точке падения 22,6 м/с. Определить среднюю силу сопротивления при движении мяча.
Обсуждение
29.06.2019, 09:46
общий
это ответ
Здравствуйте, dar777!
Действие силы
сопротивления, направленной противоположно силе 
тяжести, на мяч массой 
падающий с высоты 
приводит к тому, что кинетическая энергия 
мяча в точке падения меньше, чем кинетическая энергия в той же точке при действии только силы тяжести, на величину работы 
силы сопротивления на перемещении мяча, то есть
откуда получим
(Н).
При этом ускорение мяча составляет
(м/с2),
а время падения
(с),
что, учитывая погрешности, связанные с округлением промежуточных результатов, совпадает со значением
указанным в условии задачи.
Литература
Аксенович Л. А. и др. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Действие силы
сопротивления, направленной противоположно силе тяжести, на мяч массой падающий с высоты приводит к тому, что кинетическая энергия мяча в точке падения меньше, чем кинетическая энергия в той же точке при действии только силы тяжести, на величину работы силы сопротивления на перемещении мяча, то естьоткуда получим
(Н).При этом ускорение мяча составляет
(м/с2),а время падения
(с),что, учитывая погрешности, связанные с округлением промежуточных результатов, совпадает со значением
указанным в условии задачи.Литература
Аксенович Л. А. и др. 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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