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Консультация № 199204
22.09.2020, 10:02
0.00 руб.
0
5
1
Здравствуйте! Прошу помощи в следующем вопросе:
автомобиль движется по мокрому асфальту со скоростью 60 км/ч. Принимая радиус колеса равным 0,60 м найти на какую высоту забрасываются капли воды, отрывающиеся от колеса.
Обязательно сделать рисунок.
автомобиль движется по мокрому асфальту со скоростью 60 км/ч. Принимая радиус колеса равным 0,60 м найти на какую высоту забрасываются капли воды, отрывающиеся от колеса.
Обязательно сделать рисунок.
Обсуждение
22.09.2020, 18:32
общий
это ответ
Здравствуйте, dar777!
В системе отсчёта, связанной с автомобилем (взгляд из кабины водителя), нижняя точка колеса движется вместе с дорогой навстречу автомобилю со скоростью дороги, т.е. со скоростью 60 км/час~16,7 м/с. Если капля срывается с колеса, имея вертикально направленную скорость (это происходит на уровне оси колеса), то она поднимается выше точки отрыва на высоту h=(v*v)/2g. Относительно земли она поднимется на высоту h+R=14,5 м.
В системе отсчёта, связанной с автомобилем (взгляд из кабины водителя), нижняя точка колеса движется вместе с дорогой навстречу автомобилю со скоростью дороги, т.е. со скоростью 60 км/час~16,7 м/с. Если капля срывается с колеса, имея вертикально направленную скорость (это происходит на уровне оси колеса), то она поднимается выше точки отрыва на высоту h=(v*v)/2g. Относительно земли она поднимется на высоту h+R=14,5 м.
5
Это самое лучшее решение!
25.09.2020, 23:31
общий
26.09.2020, 08:25
Адресаты:
Если капля срывается с колеса, имея вертикально направленную скорость (это происходит на уровне оси колеса) ... а почему капля срывается на уровне оси, я что-то не могу включиться? 
Об авторе:
С уважением
shvetski
С уважением
shvetski
26.09.2020, 16:36
общий
Адресаты:
Капля может оторваться где угодно. Но если нас интересует вопрос о максимальной высоте подъёма капли, то она должна оторваться тогда, когда её скорость в системе отсчёта связанной с автомобилем направлена вертикально верх. Но в этот момент радиус, на котором находится капля, расположен горизонтально. Т.е. расстояние от капли до земли в этот момент равно радиусу колеса.
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