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Консультация № 188618
08.01.2016, 18:08
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Уважаемые эксперты! Пожалуйста, помогите решит:
Тело брошено с некоторой высоты горизонтально со скоростью 10 м/с. Через сколько секунд кинетическая энергия тела возрастет вдвое?
Тело брошено с некоторой высоты горизонтально со скоростью 10 м/с. Через сколько секунд кинетическая энергия тела возрастет вдвое?
Обсуждение
08.01.2016, 18:27
общий
это ответ
Здравствуйте, evgesha_018!
Если не учитывать сопротивление воздуха, то у тела, брошенного горизонтально с некоторой высоты, горизонтальная составляющая скорости
остаётся постоянной всё время полёта. Вертикальная составляющая скорости 
(ось ординат направим вниз) под действием силы тяжести увеличивается. Чтобы кинетическая энергия тела возросла вдвое, нужно, чтобы вертикальная составляющая скорости стала равной 
Нетрудно убедиться, что в этом случае действительно скорость тела составляет
а отношение кинетических энергий - начальной
и требуемой 
-
Требуемой величины вертикальная составляющая скорости тела достигнет через
С уважением.
Если не учитывать сопротивление воздуха, то у тела, брошенного горизонтально с некоторой высоты, горизонтальная составляющая скорости
остаётся постоянной всё время полёта. Вертикальная составляющая скорости (ось ординат направим вниз) под действием силы тяжести увеличивается. Чтобы кинетическая энергия тела возросла вдвое, нужно, чтобы вертикальная составляющая скорости стала равной Нетрудно убедиться, что в этом случае действительно скорость тела составляета отношение кинетических энергий - начальной
и требуемой -Требуемой величины вертикальная составляющая скорости тела достигнет через
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
09.01.2016, 21:24
общий
Адресаты:
Скорее всего, мне придётся изменить решение задачи. Я сообщу Вам об этом.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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