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Консультация № 110355
21.11.2007, 08:31
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Помогите,пожалйста , решить задачу!
Тело, брошено под углом 30 град. к горизонту со скоростью 15 м/с Определить измение импульса силы.
Тело, брошено под углом 30 град. к горизонту со скоростью 15 м/с Определить измение импульса силы.
Обсуждение
Неизвестный
22.11.2007, 08:31
общий
это ответ
Здравствуйте, Немнонова Тамара Владимировна!
Тело, брошено под углом 30 град. к горизонту со скоростью 15 м/с Определить измение импульса силы.
Вообще-то задача сформулирована неправильно.
Нет такого понятия как изменение импулса силы, есть понятие как импульс силы.
Импульс силы упрощённо это произведение силы на время.
Время в Вашей задаче не указано.
Я полагаю, что это время полёта тела, а сила - сила тяжести.
Но так как у Вас не задана масса тела, то невозможно посчитать чему равна сила тяжести.
Решим в общем виде.
Вертикальная скорость v sin(φ) меняется за время полёта до -v sin(φ), т.е. на 2v sin(φ).
Изменение количества движения равно импульсу силы, т.е. 2mv sin(φ) = 2*m*15*sin(30) = 15m
Тело, брошено под углом 30 град. к горизонту со скоростью 15 м/с Определить измение импульса силы.
Вообще-то задача сформулирована неправильно.
Нет такого понятия как изменение импулса силы, есть понятие как импульс силы.
Импульс силы упрощённо это произведение силы на время.
Время в Вашей задаче не указано.
Я полагаю, что это время полёта тела, а сила - сила тяжести.
Но так как у Вас не задана масса тела, то невозможно посчитать чему равна сила тяжести.
Решим в общем виде.
Вертикальная скорость v sin(φ) меняется за время полёта до -v sin(φ), т.е. на 2v sin(φ).
Изменение количества движения равно импульсу силы, т.е. 2mv sin(φ) = 2*m*15*sin(30) = 15m
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