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Консультация № 190970
08.05.2017, 16:56
0.00 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Под каким углом α к горизонту следует бросить камень с начальной скоростью v0=20 м/с, чтобы за время дельта t = 0,2с после старта вектор скорости камня:
а) уменьшился по величине на |дельта v| = 1,0 м/с,
б) повернулся на угол дельта ф=1 ?
Под каким углом α к горизонту следует бросить камень с начальной скоростью v0=20 м/с, чтобы за время дельта t = 0,2с после старта вектор скорости камня:
а) уменьшился по величине на |дельта v| = 1,0 м/с,
б) повернулся на угол дельта ф=1 ?
Обсуждение
10.05.2017, 15:58
общий
это ответ
Здравствуйте, vlaad!
Если построить треугольник скоростей
учитывая, что первые два вектора имеют одинаковые горизонтальные составляющие, а вертикальная составляющая второго вектора есть геометрическая сумма вертикальной составляющей первого вектора и вектора 
причём 
(м/с), то для проекций векторов на горизонтальную и вертикальную оси получим
Возводя эти равенства в квадрат и складывая, получим
Здесь рассматривалась задача, которая отличается от второй части задачи, сформулированной Вами, только значением
Чтобы вычислить искомый угол, приходится решать сложное уравнение. Однако другого способа решения я не вижу и могу предложить Вам только этот. Я надеюсь, что Вы сумеете самостоятельно выполнить вычисления.
Если построить треугольник скоростей
учитывая, что первые два вектора имеют одинаковые горизонтальные составляющие, а вертикальная составляющая второго вектора есть геометрическая сумма вертикальной составляющей первого вектора и вектора причём (м/с), то для проекций векторов на горизонтальную и вертикальную оси получимВозводя эти равенства в квадрат и складывая, получим
Здесь рассматривалась задача, которая отличается от второй части задачи, сформулированной Вами, только значением
Чтобы вычислить искомый угол, приходится решать сложное уравнение. Однако другого способа решения я не вижу и могу предложить Вам только этот. Я надеюсь, что Вы сумеете самостоятельно выполнить вычисления.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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