Задача №28.3

Условие

Поезд массы 4*105 кг входит на подъем i=tgα=0,006 (где α — угол подъема) со скоростью 15 м/с. Коэффициент трения (коэффициент суммарного сопротивления) при движении поезда равен 0,005. Через 50 с после входа поезда на подъем его скорость падает до 12,5 м/с. Найти силу тяги тепловоза.

Решение




Предыдущая задача №2
По шероховатой наклонной плоскости, составляющей с горизонтом угол α=30°, спускается тяжелое тело без начальной скорости. Определить, в течение какого времени T тело пройдет путь длины l=39,2 м, если коэффициент трения f=0,2.
Следующая 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?
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
2.5
2.6
2.7
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2.10
2.11
2.12
2.13
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2.55
3.1
3.2
3.3
3.4
3.5
3.6
3.7
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4.1
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5.1
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6.1
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7.1
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8.1
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9.1
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10.1
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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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21.2
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22.1
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23.1
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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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27.1
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27.48
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27.55
27.58
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27.61
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27.64
27.65
28.1
28.2
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28.4
28.5
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29.1
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30.1
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31.1
31.2
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31.4
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31.11
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31.15
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31.25
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31.32
31.33
31.34
31.35
32.1
32.2
32.3
32.4
32.5
32.6
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32.8
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32.10
32.11
32.12
32.13
32.14
32.15
32.16
32.17
32.18
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32.20
32.21
32.22
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32.24
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32.26
32.27
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32.29
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32.31
32.32
32.33
32.34
32.35
32.36
32.37
32.38
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32.40
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32.44
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32.46
32.47
32.48
32.49
32.50
32.51
32.52
32.53
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32.55
32.56
32.57
32.58
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
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
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34.1
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34.6
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35.1
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36.1
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37.1
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37.48
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37.55
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37.59
38.1
38.2
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38.5
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38.53
39.1
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39.4
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40.1
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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
47.2
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48.1
48.5
48.6
48.7
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48.12
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48.27
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48.31
48.33
48.34
48.35
48.38
48.40
48.41
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48.43
48.44
48.48
48.49
49.1
49.2
49.3
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49.11
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53.5
53.12
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53.16
54.1
54.2
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54.5
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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55.6
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55.21
55.25
55.38
55.41
55.44
56.3
56.7
56.9
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