Задача №3.25
Условие
Кран для загрузки материалов в мартеновскую печь состоит из лебедки A, ходящей на колесах по рельсам, уложенным на балках передвижного моста B. К нижней части лебедки прикреплена опрокинутая колонна D, служащая для укрепления лопаты C. Какой вес P должна иметь лебедка с колонной, чтобы груз Q=15 кН, помещенный на лопате на расстоянии 5 м от вертикальной оси OA лебедки, не опрокидывал ее? Центр тяжести лебедки расположен на оси OA; расстояние каждого колеса от оси OA равно 1 м.Решение
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1.1
1.2
1.3
1.4
1.5
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
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2.13
2.14
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2.21
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2.25
2.26
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2.31
2.32
2.33
2.34
2.35
2.36
2.37
2.38
2.39
2.40
2.41
2.42
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2.44
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2.46
2.47
2.48
2.49
2.50
2.51
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2.53
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2.55
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
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3.13
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3.16
3.17
3.18
3.19
3.20
3.21
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3.25
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3.34
3.35
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4.1
4.2
4.3
4.4
4.5
4.6
4.7
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4.13
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4.53
4.54
4.55
4.56
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4.61
4.62
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4.64
4.65
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4.74
5.1
5.2
5.3
5.4
5.5
5.6
5.7
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5.42
6.1
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6.6
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7.1
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8.1
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8.39
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8.43
9.1
9.2
9.3
9.4
9.5
9.6
9.7
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9.12
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9.20
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10.1
10.2
10.3
10.4
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10.23
11.1
11.2
11.3
11.4
11.5
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12.1
12.2
12.3
12.4
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12.6
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12.11
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13.1
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13.4
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14.1
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15.1
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16.1
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16.41
17.1
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18.1
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18.41
19.1
19.2
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20.1
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20.4
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20.13
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21.2
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22.1
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23.1
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23.31
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23.35
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23.47
23.48
23.49
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23.51
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23.53
23.54
23.55
23.56
23.57
23.58
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23.60
23.61
23.62
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23.64
23.65
23.66
23.67
23.68
23.69
23.70
23.71
24.1
24.2
24.3
24.4
24.5
24.6
24.7
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24.10
24.11
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24.25
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24.31
24.34
24.35
24.36
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24.44
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24.46
25.1
25.2
25.3
25.4
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25.7
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25.18
26.1
26.2
26.3
26.4
26.5
26.6
26.7
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26.10
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26.25
26.26
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26.31
26.32
26.33
26.34
26.35
27.1
27.2
27.3
27.4
27.5
27.6
27.7
27.8
27.9
27.10
27.11
27.12
27.13
27.14
27.15
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27.17
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27.19
27.20
27.21
27.22
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27.24
27.25
27.26
27.27
27.28
27.29
27.30
27.32
27.33
27.34
27.35
27.36
27.37
27.38
27.39
27.40
27.41
27.42
27.43
27.44
27.45
27.46
27.47
27.48
27.49
27.50
27.51
27.52
27.54
27.55
27.58
27.59
27.60
27.61
27.62
27.63
27.64
27.65
28.1
28.2
28.3
28.4
28.5
28.6
28.7
28.8
28.9
28.10
28.11
28.12
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28.14
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28.18
28.19
28.20
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28.22
29.1
29.2
29.3
29.4
29.5
29.6
29.7
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29.9
29.10
29.11
29.12
29.13
29.14
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29.16
30.1
30.2
30.3
30.4
30.5
30.6
30.7
30.8
30.9
30.10
30.11
30.12
30.13
30.14
30.15
30.16
30.17
30.18
30.19
30.20
30.21
30.22
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30.24
30.25
30.26
30.27
30.28
30.29
30.30
31.1
31.2
31.3
31.4
31.5
31.6
31.7
31.8
31.9
31.11
31.13
31.14
31.15
31.16
31.17
31.18
31.19
31.20
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31.25
31.26
31.27
31.28
31.29
31.30
31.31
31.32
31.33
31.34
31.35
32.1
32.2
32.3
32.4
32.5
32.6
32.7
32.8
32.9
32.10
32.11
32.12
32.13
32.14
32.15
32.16
32.17
32.18
32.19
32.20
32.21
32.22
32.23
32.24
32.25
32.26
32.27
32.28
32.29
32.30
32.31
32.32
32.33
32.34
32.35
32.36
32.37
32.38
32.39
32.40
32.41
32.42
32.43
32.44
32.45
32.46
32.47
32.48
32.49
32.50
32.51
32.52
32.53
32.54
32.55
32.56
32.57
32.58
32.59
32.60
32.61
32.62
32.63
32.64
32.65
32.66
32.67
32.68
32.69
32.70
32.71
32.72
32.73
32.74
32.75
32.76
32.77
32.79
32.80
32.81
32.82
32.83
32.84
32.85
32.86
32.87
32.88
32.89
32.90
32.91
32.92
32.93
32.94
32.95
32.96
32.97
32.98
32.99
32.100
32.101
32.102
32.103
32.104
32.105
32.106
32.107
33.1
33.2
33.3
33.4
33.5
33.6
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33.10
33.11
33.12
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33.14
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33.16
33.17
33.18
33.19
33.20
33.21
33.22
34.1
34.2
34.3
34.4
34.5
34.6
34.7
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34.10
34.11
34.12
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34.29
34.30
34.31
35.1
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35.3
35.4
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36.1
36.2
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36.4
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36.14
37.1
37.2
37.3
37.4
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37.6
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37.11
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37.13
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37.33
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37.35
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37.37
37.38
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37.40
37.41
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37.43
37.44
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37.48
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37.54
37.55
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37.57
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37.59
38.1
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38.5
38.6
38.7
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38.31
38.32
38.33
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38.38
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38.53
39.1
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40.1
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41.1
41.2
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41.4
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42.1
42.2
42.3
42.4
42.5
42.6
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43.1
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43.3
43.4
43.6
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44.1
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45.3
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45.6
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46.1
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46.32
47.1
47.2
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48.1
48.5
48.6
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48.31
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48.38
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48.43
48.44
48.48
48.49
49.1
49.2
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49.4
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49.11
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53.5
53.12
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54.1
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54.5
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54.18
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54.22
54.32
54.33
54.35
55.2
55.3
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55.38
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55.44
56.3
56.7
56.9