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Консультация № 190569
17.02.2017, 16:58
0.00 руб.
23.02.2017, 14:48
1
1
1
Здравствуйте, уважаемые эксперты! Помогите с задачкой! Заранее благодарю! 
При движении автомобиля на подъёме с углом наклона поверхности дороги к горизонту
у него устанавливается скорость 
при полезной мощности автомобиля 
кВт. При движении автомобиля по горизонтальному участку дороги при той же полезной мощности у него устанавливается скорость 
Какую полезную мощность должен развивать автомобиль при спуске с углом наклона поверхности дороги 
со скоростью 
? Сила сопротивления движению автомобиля пропорциональна квадрату его скорости.
При движении автомобиля на подъёме с углом наклона поверхности дороги к горизонту
у него устанавливается скорость при полезной мощности автомобиля кВт. При движении автомобиля по горизонтальному участку дороги при той же полезной мощности у него устанавливается скорость Какую полезную мощность должен развивать автомобиль при спуске с углом наклона поверхности дороги со скоростью ? Сила сопротивления движению автомобиля пропорциональна квадрату его скорости.
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Обсуждение
23.02.2017, 15:57
общий
это ответ
Здравствуйте, Валерий!
Автомобиль движется с установившейся скоростью под действием силы тяжести
силы тяги 
силы сопротивления 
нормальной реакции дороги 
В проекции на направление движения автомобиля по второму закону Ньютона получим
- при движении на подъёме
- при движении по горизонтальному участку
- при движении на спуске
Учитывая, что полезная мощность при движении на подъёме и при движении по горизонтальному участку, согласно условию задачи, одна и та же, приравняем друг другу правые части выражений
и 
получим
и подставим в уравнение
Тогда при 
(кВт).
Автомобиль должен развивать при спуске полезную мощность
кВт.
Автомобиль движется с установившейся скоростью под действием силы тяжести
силы тяги силы сопротивления нормальной реакции дороги В проекции на направление движения автомобиля по второму закону Ньютона получим- при движении на подъёме
- при движении по горизонтальному участку
- при движении на спуске
Учитывая, что полезная мощность при движении на подъёме и при движении по горизонтальному участку, согласно условию задачи, одна и та же, приравняем друг другу правые части выражений
и получими подставим в уравнение
Тогда при (кВт).Автомобиль должен развивать при спуске полезную мощность
кВт.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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