Задача №5.22

Условие

Трамвайная дверь отодвигается с трением в нижнем пазу. Коэффициент трения f не более 0,5. Определить наибольшую высоту h, на которой можно поместить ручку двери, чтобы дверь при отодвигании не опрокидывалась. Ширина двери l=0,8 м; центр тяжести двери находится на ее вертикальной оси симметрии.

Решение




Предыдущая задача №21
К валу приложена пара сил с моментом M=100 Н*м. На валу заключено тормозное колесо, радиус r которого равен 25 см. Найти, с какой силой Q надо прижимать к колесу тормозные колодки, чтобы колесо оставалось в покое, если коэффициент трения покоя f между колесом и колодками равен 0,25.
Следующая задача №23
Цилиндрический вал веса Q и радиуса R приводится во вращение грузом, подвешенным к нему на веревке; вес груза равен P. Радиус шипов вала r=R/2. Коэффициент трения в подшипниках равен 0,05. Определить, при каком отношении веса Q к весу P груза последний опускается равномерно.
Источник: Решебник Мещерского 12 класс
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1.1
1.2
1.3
1.4
1.5
2.1
2.2
2.3
2.4
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3.1
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4.1
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5.1
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6.1
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9.1
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10.1
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12.1
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17.1
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18.1
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19.1
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20.1
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23.1
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24.1
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25.1
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26.1
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27.1
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28.1
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29.1
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30.1
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31.1
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32.1
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32.107
33.1
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34.1
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35.1
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36.1
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37.1
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38.1
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39.1
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41.1
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42.1
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43.1
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44.1
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45.3
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46.1
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47.1
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48.1
48.5
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48.44
48.48
48.49
49.1
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53.5
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54.1
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55.2
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56.3
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56.9
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