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Консультация № 188246
26.11.2015, 03:02
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Здравствуйте! Прошу помощи в следующем вопросе:Теннисный мяч упруго ударяется об стену и отскакивает со скоростью 10 м/сек. Масса мяча 100 г., время взаимодействия со стеной 0,01 сек. Найти силу, с
которой стена воздействует на мяч
которой стена воздействует на мяч
Обсуждение
26.11.2015, 14:50
общий
это ответ
Здравствуйте, Сидорова Наталья!
Если на тело действует сила F в течение времени [$916$]t, то изменение импульса тела равно иимпульсу силы: [$916$]p = F[$916$]t. При постоянной массе тела изменение импульса определяется только изменением скорости: [$916$]p = m[$916$]v. Следовательно,
В данном случае m = 100 г = 0.1 кг, [$916$]v = 20 м/с (если считать, что мяч ударяется об стену под прямым углом с той же скоростью 10 м/с, что и отскакивает от неё), [$916$]t = 0.01 с, и сила воздействия стены будет равна
Если на тело действует сила F в течение времени [$916$]t, то изменение импульса тела равно иимпульсу силы: [$916$]p = F[$916$]t. При постоянной массе тела изменение импульса определяется только изменением скорости: [$916$]p = m[$916$]v. Следовательно,
В данном случае m = 100 г = 0.1 кг, [$916$]v = 20 м/с (если считать, что мяч ударяется об стену под прямым углом с той же скоростью 10 м/с, что и отскакивает от неё), [$916$]t = 0.01 с, и сила воздействия стены будет равна
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