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Консультация № 180057
27.09.2010, 19:49
43.38 руб.
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118. Ось с двумя параллельными бумажными дисками, расположенными на расстоянии 0,5 м друг от друга, вращается с частотой 1200 об/мин. Пуля, летящая вдоль оси, пробивает оба диска; пробоины в дисках смещены друг относительно друга на угол 15о. Найти скорость пули. Силой тяжести, действующей на пулю, пренебречь.
138. Однородный диск радиусом 0,2 м и массой 0,5 кг вращается вокруг оси, про¬хо-дящей через его центр, под действием касательной силы, приложенной к обо¬ду диска. Зависимость угловой скорости диска от времени дается урав¬не¬ни¬ем =A+Bt, где В=8 рад/с2. Найти величину каса¬тель¬ной силы. Трением пренебречь.
208. На поверхности Земли барометр показывает 101 кПа. Каково будет давление при подъеме барометра на высоту 540 м. Температуру считать одинаковой и равной 7 0С.
138. Однородный диск радиусом 0,2 м и массой 0,5 кг вращается вокруг оси, про¬хо-дящей через его центр, под действием касательной силы, приложенной к обо¬ду диска. Зависимость угловой скорости диска от времени дается урав¬не¬ни¬ем =A+Bt, где В=8 рад/с2. Найти величину каса¬тель¬ной силы. Трением пренебречь.
208. На поверхности Земли барометр показывает 101 кПа. Каково будет давление при подъеме барометра на высоту 540 м. Температуру считать одинаковой и равной 7 0С.
Обсуждение
27.09.2010, 20:18
общий
это ответ
Здравствуйте, Ильчук Кирилл Юрьевич.
118. За то время, пока пуля преодолевает расстояние между дисками, они поворачиваются на 15[$176$]
Частота вращения диска n=1200об/мин/60с/мин=20 об/с=20 Гц
Период обращения T=1/n=1/20=0,05 с
Время, требуемое для поворота на 15[$176$]
t=T[$183$]15/360=T/24=1/450 c
скорость пули v=H/t=0.5м[$183$]450с[sup]-1[/sup]=225 м/с
138. Момент инерции диска I=mR2/2
Угловое ускорение [$949$]=d[$969$]/dt=B
Момент силы M=[$949$]I=BmR2/2
Сила F=M/R=BmR/2=8рад/с[sup]2[/sup][$183$]0,5кг[$183$]0,2м/2=0,4 Н
208. Барометрическая формула
ph=p0[$183$]e-h[$183$]gM/(RT)
p0=101 кПа
h=540 м
T=280 K
М=0,029 кг/моль
R=8,314 Дж/(моль[$183$]К)
ph=101кПа[$183$]e-540[$183$]9,8[$183$]0,029/(8,314[$183$]280)=94,6 кПа
118. За то время, пока пуля преодолевает расстояние между дисками, они поворачиваются на 15[$176$]
Частота вращения диска n=1200об/мин/60с/мин=20 об/с=20 Гц
Период обращения T=1/n=1/20=0,05 с
Время, требуемое для поворота на 15[$176$]
t=T[$183$]15/360=T/24=1/450 c
скорость пули v=H/t=0.5м[$183$]450с[sup]-1[/sup]=225 м/с
138. Момент инерции диска I=mR2/2
Угловое ускорение [$949$]=d[$969$]/dt=B
Момент силы M=[$949$]I=BmR2/2
Сила F=M/R=BmR/2=8рад/с[sup]2[/sup][$183$]0,5кг[$183$]0,2м/2=0,4 Н
208. Барометрическая формула
ph=p0[$183$]e-h[$183$]gM/(RT)
p0=101 кПа
h=540 м
T=280 K
М=0,029 кг/моль
R=8,314 Дж/(моль[$183$]К)
ph=101кПа[$183$]e-540[$183$]9,8[$183$]0,029/(8,314[$183$]280)=94,6 кПа
Форма ответа
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