Задача №27.28
Условие
Буер, весящий вместе с пассажирами Q=1962 H, движется прямолинейно по гладкой горизонтальной поверхности льда вследствие давления ветра на парус, плоскость которого ab образует угол 45° с направлением движения. Абсолютная скорость w ветра перпендикулярна направлению движения. Величина силы давления ветра P выражается формулой Ньютона: P=kSu2cos2φ, где φ — угол, образуемый относительной скоростью ветра u с перпендикуляром N к плоскости паруса, S=5 м2 — площадь паруса, k=0,113 — опытный коэффициент. Сила давления P направлена перпендикулярно плоскости ab. Пренебрегая трением, найти:1) какую наибольшую скорость vmax может получить буер;
2) какой угол α составляет при этой скорости помещенный на мачте флюгер с плоскостью паруса;
3) какой путь x1 должен пройти буер для того, чтобы приобрести скорость v=2/3w, если его начальная скорость равна нулю.
Решение
☆
Добавить в избранное
1.1
1.2
1.3
1.4
1.5
2.1
2.2
2.3
2.4
2.5
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2.55
3.1
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4.1
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5.1
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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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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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24.1
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25.1
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26.1
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27.1
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27.55
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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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32.55
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32.86
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32.89
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32.107
33.1
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34.1
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35.1
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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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48.48
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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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56.9