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Консультация № 192012
05.12.2017, 15:50
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
.Колесо, вращаясь равнозамедленно, при торможении уменьшило свою скорость с 300 об/мин до 180 об/мин. За это время оно сделало 240 полных оборотов. Найти угловое ускорение колеса и время торможения.
.Колесо, вращаясь равнозамедленно, при торможении уменьшило свою скорость с 300 об/мин до 180 об/мин. За это время оно сделало 240 полных оборотов. Найти угловое ускорение колеса и время торможения.
Обсуждение
05.12.2017, 15:52
общий
Грузы массами 0,5 кг и 0,3 кг соединены нитью и перекинуты через невесомый блок, укреплённый на конце стола. Коэффициент трения груза о стол 0,15. Пренебрегая трением в блоке, определить: 1) ускорение, с которым движутся грузы; 2) силу натяжения нити.
05.12.2017, 17:04
общий
это ответ
Здравствуйте, polumisko91!
n1=300 об./мин -- начальная частота вращения колеса,
n2=180 об./мин -- конечная частота вращения колеса,
N=240 об. - количество оборотов колеса.
Уменьшая угловую скорость от [$969$]1=[$960$]n1/30 до [$969$]2=[$960$]n2/30 колесо осуществит угловое перемещение [$966$]=2[$960$]N за время
При этом угловое ускорение составит
n1=300 об./мин -- начальная частота вращения колеса,
n2=180 об./мин -- конечная частота вращения колеса,
N=240 об. - количество оборотов колеса.
Уменьшая угловую скорость от [$969$]1=[$960$]n1/30 до [$969$]2=[$960$]n2/30 колесо осуществит угловое перемещение [$966$]=2[$960$]N за время
t=2[$966$]/([$969$]1+[$969$]2)=120N/(n1+n2)=120[$183$]240/(300+180)=60 (с).
При этом угловое ускорение составит
[$949$]=([$969$]1-[$969$]2)/t=[$960$](6-10)/60=-[$960$]/15[$8776$]-0,21 (рад/с2).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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