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Задать вопрос экспертам

Консультация № 200679

19.04.2021, 17:12

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0 1 1

Образование

Здравствуйте! У меня возникли сложности с таким вопросом:
Вентилятор вращается со скоростью, соответствующей 900 об / мин. После выключения вентилятор, вращаясь равнозаме́дленно, Сделал до остановки 75 об. Работа сил торможения равна 44,4 Дж. Найти: 1) момент инерции вентилятора; 2) момент силы торможения.

Обсуждение

давно

Посетитель
226425
1567

19.04.2021, 22:08

общий

это ответ

Здравствуйте, ushatalal!
f=900 об/мин=15 об/с = 15 Гц
следовательно
[$969$]_o=2[$960$]f = 30[$960$] c^-1
[$969$]=0
N=75
Следовательно, угол поворота
[$966$]=2[$960$]N=150[$960$]
А_торм=44,4 Дж
Найти:
J; M
Решение:
1. Кинетическая энергия в момент начала торможения
W_k=(1/2)*J*[$969$]_o²
W_k=A_торм
Следовательно
J=2*A_торм/[$969$]_o² = 2*44,4/(30[$960$])² = 0,2 кг*м[sup]2[/sup]
2. Из условия вентилятор вращался равнозамедленно, следовательно момент тормозящей силы был постоянным, тогда работа тормозящей силы
A_торм=M*[$966$]
Отсюда
M=A_торм/[$966$] = 44,4/150[$960$] = 0,1 Н*м
***
Удачи

Об авторе:
С уважением
shvetski

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