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Консультация № 194831
28.02.2019, 18:12
0.00 руб.
01.03.2019, 09:36
1
4
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Помогите решить задачу. Спасибо.
Частица движется так, что её радиус-вектор зависит от времени по закону
где
-- постоянные величины, 
-- единичные орты в декартовой системе координат. Через сколько секунд скорость частицы окажется перпендикулярной оси 
если 
c, 
м, 
м, 
рад/с.
а)
с; б) 
с; в) 
с; г) 
с; д) 
с.
Помогите решить задачу. Спасибо.
Частица движется так, что её радиус-вектор зависит от времени по закону
где
-- постоянные величины, -- единичные орты в декартовой системе координат. Через сколько секунд скорость частицы окажется перпендикулярной оси если c, м, м, рад/с.а)
с; б) с; в) с; г) с; д) с.
Прикрепленные файлы:
Обсуждение
01.03.2019, 08:17
общий
это ответ
Здравствуйте, nata!
Если
то
Вектор
перпендикулярен оси если его компонента вдоль оси 
равна нулю, а компоненты вдоль остальных осей не равны нулю одновременно, то есть
Решая уравнение (1), получим
с, 
с, 
с.
При любом из полученных корней неравенство (2) выполняется.
Из предложенных в условии задачи значений
подходит вариант б).
Если
то
Вектор
перпендикулярен оси если его компонента вдоль оси равна нулю, а компоненты вдоль остальных осей не равны нулю одновременно, то естьРешая уравнение (1), получим
с, с, с.При любом из полученных корней неравенство (2) выполняется.
Из предложенных в условии задачи значений
подходит вариант б).
5
Спасибо за решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
01.03.2019, 08:17
общий
Предлагаю дополнить сообщение, открывающее консультацию, текстом задания, набранным мной ниже.
Частица движется так, что её радиус-вектор зависит от времени по закону
где -- постоянные величины, -- единичные орты в декартовой системе координат. Через сколько секунд скорость частицы окажется перпендикулярной оси если c, м, м, рад/с.
а) с; б) с; в) с; г) с; д) с.
Частица движется так, что её радиус-вектор зависит от времени по закону
где
-- постоянные величины, -- единичные орты в декартовой системе координат. Через сколько секунд скорость частицы окажется перпендикулярной оси если c, м, м, рад/с.а)
с; б) с; в) с; г) с; д) с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
01.03.2019, 12:27
общий
Адресаты:
Сделано.
Об авторе:
We have but faith: we cannot know;
For knowledge is of things we see;
And yet we trust it comes from thee,
A beam in darkness: let it grow.
-----
https://www.linkedin.com/in/andreynkuznetsov
https://www.researchgate.net/profile/Andrey_Kuznetsov11
http://www.researcherid.com/rid/K-8824-2014
We have but faith: we cannot know;
For knowledge is of things we see;
And yet we trust it comes from thee,
A beam in darkness: let it grow.
-----
https://www.linkedin.com/in/andreynkuznetsov
https://www.researchgate.net/profile/Andrey_Kuznetsov11
http://www.researcherid.com/rid/K-8824-2014
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