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Консультация № 173415
19.10.2009, 09:53
0.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Помогите, пожалуйста, решить задачу: 
2. 20. Камень, привязанный к веревке длиной l = 50 см, равномерно вращается в вертикальной плоскости. При какой частоте вращения ν веревка разорвется, если известно, что она разрывается при силе натяжения, равной десятикратной силе тяжести, действующей на камень?
Должно получиться: 2,1 с-1.ачу:
2. 20. Камень, привязанный к веревке длиной l = 50 см, равномерно вращается в вертикальной плоскости. При какой частоте вращения ν веревка разорвется, если известно, что она разрывается при силе натяжения, равной десятикратной силе тяжести, действующей на камень?
Должно получиться: 2,1 с-1.ачу:
Обсуждение
22.10.2009, 15:47
общий
это ответ
Здравствуйте, kot31.
Дано:
l= 50 см = 0,5 м
Ткр=10mg
Найти:
fкр
Решение:
Второй закон Ньютона:
mg+T=ma
Тогда, в проекции на ось х
T-mg=ma
C учетом условия
10mg-mg=ma
9g=a
a=[$969$]2*l
[$8658$] [$969$]=[$8730$](9g/l) = 13.4 c-1
f=[$969$]/2*pi = 2.1 Гц
Удачи
Дано:
l= 50 см = 0,5 м
Ткр=10mg
Найти:
fкр
Решение:
Второй закон Ньютона:
mg+T=ma
Тогда, в проекции на ось х
T-mg=ma
C учетом условия
10mg-mg=ma
9g=a
a=[$969$]2*l
[$8658$] [$969$]=[$8730$](9g/l) = 13.4 c-1
f=[$969$]/2*pi = 2.1 Гц
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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