Задача №27.26
Условие
Вагон массы 9216 кг приходит в движение вследствие действия ветра, дующего вдоль полотна, и движется по горизонтальному пути. Сопротивление движению вагона равно 1/200 его веса. Сила давления ветра P=kSu2, где S — площадь задней стенки вагона, подверженной давлению ветра, равная 6 м2, u — скорость ветра относительно вагона, a k=1,2. Абсолютная скорость ветра v=12 м/с. Считая начальную скорость вагона равной нулю, определить:1) наибольшую скорость vmax вагона;
2) время T, которое потребовалось бы для достижения этой скорости;
3) на каком расстоянии x вагон наберет скорость 3 м/с.
Решение
☆
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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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2.55
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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9.27
10.1
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11.1
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12.1
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13.1
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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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22.1
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23.1
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23.65
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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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27.55
27.58
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27.61
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27.63
27.64
27.65
28.1
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29.1
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30.1
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31.1
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31.35
32.1
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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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32.53
32.54
32.55
32.56
32.57
32.58
32.59
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32.61
32.62
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32.64
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32.66
32.67
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32.69
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32.73
32.74
32.75
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32.85
32.86
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32.89
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32.91
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32.102
32.103
32.104
32.105
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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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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
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48.1
48.5
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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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