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Консультация № 179120
16.06.2010, 07:52
45.00 руб.
0
2
2
Помогите плиз щас экзамен надо решить как можно быстро((( Заранее спасибо
Колесо, вращаясь равнозамедленно, при торможении уменьшило свою частоту за 1 мин с 300 до 180 об./мин.Найти угловое ускорение колеса и частоту оборотов, сделанных им за это время
Колесо, вращаясь равнозамедленно, при торможении уменьшило свою частоту за 1 мин с 300 до 180 об./мин.Найти угловое ускорение колеса и частоту оборотов, сделанных им за это время
Обсуждение
16.06.2010, 08:22
общий
это ответ
Здравствуйте, Чемезов Сергей Михайлович.
Так как вращение равнозамедленное, то
N=(n1+n2)*t/2=(5+3)*60/2=240
Угловая скорость [$969$]=[$969$]0-[$958$]t
[$969$]0=n1*2п
[$969$]=n2*2п
[$958$]t=[$969$]0-[$969$]
[$958$]=([$969$]0-[$969$])/t=2п(n1-n2)/t
[$958$]=2*3.14*(5-3)/60=0.21 рад/с2
Так как вращение равнозамедленное, то
N=(n1+n2)*t/2=(5+3)*60/2=240
Угловая скорость [$969$]=[$969$]0-[$958$]t
[$969$]0=n1*2п
[$969$]=n2*2п
[$958$]t=[$969$]0-[$969$]
[$958$]=([$969$]0-[$969$])/t=2п(n1-n2)/t
[$958$]=2*3.14*(5-3)/60=0.21 рад/с2
5
Неизвестный
16.06.2010, 09:54
общий
это ответ
Здравствуйте, Чемезов Сергей Михайлович!
Переведем в систему СИ: t=1мин=60с; n1=300об/мин=5об/с; n2=180об/мин=3об/с
Поскольку вращение равнозамедленное, то число оборотов: N=[(n1+n2)*t]/2=240.
Угловая скорость:w=w0-E*t (1) , где w0=n1*2*пи; w=n1*2*пи, из формулы (1) выражаем E*t=w0-w, откуда
E=(w0-w)/t=[2пи*(n1-n2)]/t, подставляем числовые данные:
Е=[2*3,14*(5-3)]/60=0,21 рад/с2
Переведем в систему СИ: t=1мин=60с; n1=300об/мин=5об/с; n2=180об/мин=3об/с
Поскольку вращение равнозамедленное, то число оборотов: N=[(n1+n2)*t]/2=240.
Угловая скорость:w=w0-E*t (1) , где w0=n1*2*пи; w=n1*2*пи, из формулы (1) выражаем E*t=w0-w, откуда
E=(w0-w)/t=[2пи*(n1-n2)]/t, подставляем числовые данные:
Е=[2*3,14*(5-3)]/60=0,21 рад/с2
5
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