Задача №28.5

Условие

Для определения массы груженого железнодорожного состава между тепловозами и вагонами установили динамометр. Среднее показание динамометра за 2 мин оказалось 106 Н. За то же время состав набрал скорость 16 м/с (вначале состав стоял на месте). Найти массу состава, если коэффициент трения f=0,02.

Решение




Предыдущая задача №4
Гирька М привязана к концу нерастяжимой нити MOA, часть которой OA пропущена через вертикальную трубку; гирька движется вокруг оси трубки по окружности радиуса MC=R, делая 120 об/мин. Медленно втягивая нить OA в трубку, укорачивают наружную часть нити до длины OM1, при которой гирька описывает окружность радиусом R/2. Сколько оборотов в минуту делает гирька по этой окружности?
Следующая задача №6
Каков должен быть коэффициент трения f колес заторможенного автомобиля о дорогу, если при скорости езды v=20 м/с он останавливается через 6 с после начала торможения.
Источник: Решебник Мещерского 12 класс
Добавить в избранное
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
2.12
2.13
2.14
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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
3.12
3.13
3.14
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4.1
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4.4
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5.1
5.2
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6.1
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7.1
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8.1
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9.1
9.2
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9.4
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10.1
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10.4
10.5
10.6
10.7
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11.1
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12.1
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13.1
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14.1
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15.1
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16.1
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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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20.13
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21.2
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22.1
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23.1
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23.62
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23.64
23.65
23.66
23.67
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23.71
24.1
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24.34
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25.1
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26.1
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26.35
27.1
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27.4
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27.6
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27.44
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27.48
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27.54
27.55
27.58
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27.60
27.61
27.62
27.63
27.64
27.65
28.1
28.2
28.3
28.4
28.5
28.6
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29.1
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30.1
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31.1
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31.25
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31.32
31.33
31.34
31.35
32.1
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32.15
32.16
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32.20
32.21
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32.26
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32.34
32.35
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32.48
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32.50
32.51
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32.55
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32.59
32.60
32.61
32.62
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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
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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
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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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34.1
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34.6
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34.31
35.1
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36.1
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37.1
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37.48
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37.54
37.55
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37.59
38.1
38.2
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38.53
39.1
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40.1
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41.1
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41.23
42.1
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43.1
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43.6
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43.13
44.1
44.2
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45.3
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45.37
46.1
46.2
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46.6
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46.32
47.1
47.2
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47.19
48.1
48.5
48.6
48.7
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48.10
48.12
48.13
48.14
48.15
48.19
48.23
48.24
48.26
48.27
48.28
48.29
48.30
48.31
48.33
48.34
48.35
48.38
48.40
48.41
48.42
48.43
48.44
48.48
48.49
49.1
49.2
49.3
49.4
49.7
49.8
49.11
49.12
49.13
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49.16
53.5
53.12
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53.16
54.1
54.2
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54.6
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54.18
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54.32
54.33
54.35
55.2
55.3
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55.21
55.25
55.38
55.41
55.44
56.3
56.7
56.9
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