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Консультация № 198496
09.05.2020, 08:11
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
На графике показана зависимость координаты материальной точки, движущейся вдоль оси x, от времени t. Найдите проекцию среднего ускорения материальной точки ax,ср на интервале 0⩽t⩽8 с. Ответ выразите в м/с2, округлив до сотых.
На графике показана зависимость координаты материальной точки, движущейся вдоль оси x, от времени t. Найдите проекцию среднего ускорения материальной точки ax,ср на интервале 0⩽t⩽8 с. Ответ выразите в м/с2, округлив до сотых.
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Обсуждение
12.05.2020, 15:52
общий
это ответ
Здравствуйте, suvorov.shool@mail.ru!
Определение : Среднее ускорение - это отношение изменения скорости к промежутку времени, за который это изменении произошло.
Определить среднее ускорение можно формулой: a[$8594$]ср = [$916$]V[$8594$] / [$916$]t
где a[$8594$]ср - вектор ускорения (см "СреднееУскорение.Физика 10й класс" Ссылка )
Судя по Вашему графику, на интервале [$916$]t = (0;2) сек приращение пути равно [$916$]x = 4 м, а [$916$]t = 2 сек.
Тогда начальная скорость V0 = [$916$]x / [$916$]t = 4 / 2 = 2 м/с.
На интервале [$916$]t = (4;8) сек приращение пути равно [$916$]x = 6-5=1 м, а [$916$]t = 8-4=4 сек.
Значит, конечная скорость Vk = [$916$]x / [$916$]t = 1 / 4 = 0,25 м/с.
На интервале [$916$]t = (0;8) сек приращение скорости равно [$916$]V = 0,25 - 2 = -1,75 м, а [$916$]t = 8-0=8 сек.
Тогда Среднее ускорение aср = [$916$]V / [$916$]t = -1,75 / 8 = -0,21875 м/с2 .
Ответ : проекция среднего ускорения равна -0,22 м/с2 (ускорение отрицательно, скорость замедляется).
Определение : Среднее ускорение - это отношение изменения скорости к промежутку времени, за который это изменении произошло.
Определить среднее ускорение можно формулой: a[$8594$]ср = [$916$]V[$8594$] / [$916$]t
где a[$8594$]ср - вектор ускорения (см "СреднееУскорение.Физика 10й класс" Ссылка )
Судя по Вашему графику, на интервале [$916$]t = (0;2) сек приращение пути равно [$916$]x = 4 м, а [$916$]t = 2 сек.
Тогда начальная скорость V0 = [$916$]x / [$916$]t = 4 / 2 = 2 м/с.
На интервале [$916$]t = (4;8) сек приращение пути равно [$916$]x = 6-5=1 м, а [$916$]t = 8-4=4 сек.
Значит, конечная скорость Vk = [$916$]x / [$916$]t = 1 / 4 = 0,25 м/с.
На интервале [$916$]t = (0;8) сек приращение скорости равно [$916$]V = 0,25 - 2 = -1,75 м, а [$916$]t = 8-0=8 сек.
Тогда Среднее ускорение aср = [$916$]V / [$916$]t = -1,75 / 8 = -0,21875 м/с2 .
Ответ : проекция среднего ускорения равна -0,22 м/с2 (ускорение отрицательно, скорость замедляется).
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