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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: 1. Время разгона автомобиля до скорости 190 км/ч составляет 19 секунд. Каково при этом среднее ускорение автомобиля? Какой путь он пройдет во время разгона (если предположить, что при разгоне автомобиль двигался равноускоренно)? Какова его средняя скорость во время разгона? 2. Возможен ли описанный в задаче 1 разгон, если коэффициент трения шин об асфальт равен 0,31?
Помогите пожалуйста решить вторую задачу (из ходя ?)исходя из первой задачи. Спасибо
Условие: Время разгона автомобиля до скорости V = 190 км/ч составляет t = 19 секунд. Вычислить возможность разгона, если коэффициент трения шин об асфальт равен µ = 0,31 .
Решение: Эта задача имеет множество возможных решений в зависимости от количества ведущих колёс автомобиля и распределения веса автомобиля м-ду ведущими и НЕведущими осями. Рассмотрим простейший вариант, будто автомобиль имеет 4 колеса, и его тип привода - 4WD - все колёса ведущие и примерно одинаково нагружены. Для упрощения расчёта можно принять, будто это какой-то одно-колёсный транспорт.
Переводим конечную скорость в международную систему СИ : Vc = V·1000 / 3600 = 52,8 м/с . Ускорение автомобиля при равно-ускоренном движении: a = Vc / t = 2,78 м/c2. Сила тяги, разгоняющая автомобиль на дороге, равна F = m·a , а вес автомобиля P = m·g , где m - масса автомобиля, а g = 9,81 м/с2 - ускорение земного тяготения. Тогда коэффициент трения шин об асфальт равен µ2 = F / P = m·a / (m·g) = a / g = 2,78 / 9,81 = 0,28 . Этот коэффициент трения меньше предельно-заданного µ = 0,31 , и такой автомобиль сможет разогнаться без пробуксовки.
Однако, у самого популярного автомобиля, имеющего только одну пару ведущих колёс, эти 2 колёса (из 4х) придавлены к асфальту лишь примерно половиной силы веса автомобиля. В этом случае заданный коэффициент трения µ = 0,31 сможет обеспечить ускорение лишь a2 = (P/2)·µ / m = m·g·µ / (2·m) = g·µ / 2 = 9,81 / (2·0,31) = 1,52 м/с2 < a
Ответ: если коэффициент трения шин об асфальт равен 0,31 , то только полно-приводный автомобиль сможет достичь заданное в Условии ускорение разгона. Обычный автомобиль с одной парой ведущих колёс будет разгоняться с пробуксовкой, дольше описанного времени, и с мЕньшим ускорением a2 = 1,52 м/с2 .
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