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Консультация № 190616
03.03.2017, 14:00
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Уважаемые эксперты! Возникли затруднения с таким вопросом,прошу помочь:
Шарик для игры в настольный теннис радиусом r=15мм и массой m=5 г погружён в воду на глубину
h=30 см. На какую высоту выпрыгнет шарик,когда его отпустят? Сопротивлением воды и воздуха пренебречь.
Шарик для игры в настольный теннис радиусом r=15мм и массой m=5 г погружён в воду на глубину
h=30 см. На какую высоту выпрыгнет шарик,когда его отпустят? Сопротивлением воды и воздуха пренебречь.
Обсуждение
04.03.2017, 19:11
общий
04.03.2017, 19:11
Играть в настольный теннис нужно круглыми мячами оранжевого или белого цвета диаметром 40 мм и весом всего 2,5 грамма.
Об авторе:
Facta loquuntur.
Facta loquuntur.
04.03.2017, 19:49
общий
это ответ
Здравствуйте, moonfox!
Будем отсчитывать высоты и потенциальную энергию шарика от поверхности воды. Скорость шарика и его кинетическая энергия в начальной и конечной точках его пути равны нулю. По закону сохранения механической энергии потенциальные энергии шарика в начальной и конечной точках должны быть одинаковыми, потому что по условию задачи сопротивлением движению можно пренебречь. Тогда при плотности
воды и плотности 
шарика
При этом плотность шарика
(кг/м3).
Значит, шарик выпрыгнет на высоту
(см).
Будем отсчитывать высоты и потенциальную энергию шарика от поверхности воды. Скорость шарика и его кинетическая энергия в начальной и конечной точках его пути равны нулю. По закону сохранения механической энергии потенциальные энергии шарика в начальной и конечной точках должны быть одинаковыми, потому что по условию задачи сопротивлением движению можно пренебречь. Тогда при плотности
воды и плотности шарикаПри этом плотность шарика
(кг/м3).Значит, шарик выпрыгнет на высоту
(см).
5
Спасибо!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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