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Консультация № 196301
03.09.2019, 19:42
0.00 руб.
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2
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Спортсмен на тренировке бежит по прямой дорожке, то ускоряя, то затормаживая свое движение. На рисунке представлен график зависимости скорости спортсмена от времени. Модуль ускорения спортсмена максимален на интервале времени:
1) от 0 до 10 с
2) от 10 до 20 с
3) от 20 до 30 с
4) от 30 до 40 с
Спортсмен на тренировке бежит по прямой дорожке, то ускоряя, то затормаживая свое движение. На рисунке представлен график зависимости скорости спортсмена от времени. Модуль ускорения спортсмена максимален на интервале времени:
1) от 0 до 10 с
2) от 10 до 20 с
3) от 20 до 30 с
4) от 30 до 40 с
Прикрепленные файлы:
Обсуждение
03.09.2019, 23:42
общий
это ответ
Здравствуйте, dar777!
Модуль ускорения максимален на интервале времени N2, от 10 до 20 с, потому что на графике все отрезки - линейны, и значит, на каждом этапе движение является равно-ускоренным.
При равно-ускоренном движени Ускорение вычисляется как A = [$916$]V / [$916$]t ,
а модуль ускорения - как абсолютная величина ускорения.
Для интервала времени1 : Ускорение A1 = (V(10) - V(0)) / (10 - 0) = (-20-10) / 10 = -3 м/с2
Модуль M1 = |A1| = 3 м/с2
Для интервала 2 : Ускорение A2 = (V(20) - V(10)) / (20 - 10) = (20-(-20)) / 10 = 4 м/с2 , Модуль M2 = |A2| = 4 м/с2
Для интервала 3 : Ускорение A3 = (V(30) - V(20)) / (30 - 20) = (0-20)) / 10 = -2 м/с2 , Модуль M3 = |A3| = 2 м/с2
Для интервала 4 : Ускорение A4 = (V(40) - V(30)) / (40 - 30) = (10 - 0)) / 10 = 1 м/с2 , Модуль M4 = |A4| = 1 м/с2
Модуль ускорения максимален на интервале времени N2, от 10 до 20 с, потому что на графике все отрезки - линейны, и значит, на каждом этапе движение является равно-ускоренным.
При равно-ускоренном движени Ускорение вычисляется как A = [$916$]V / [$916$]t ,
а модуль ускорения - как абсолютная величина ускорения.
Для интервала времени1 : Ускорение A1 = (V(10) - V(0)) / (10 - 0) = (-20-10) / 10 = -3 м/с2
Модуль M1 = |A1| = 3 м/с2
Для интервала 2 : Ускорение A2 = (V(20) - V(10)) / (20 - 10) = (20-(-20)) / 10 = 4 м/с2 , Модуль M2 = |A2| = 4 м/с2
Для интервала 3 : Ускорение A3 = (V(30) - V(20)) / (30 - 20) = (0-20)) / 10 = -2 м/с2 , Модуль M3 = |A3| = 2 м/с2
Для интервала 4 : Ускорение A4 = (V(40) - V(30)) / (40 - 30) = (10 - 0)) / 10 = 1 м/с2 , Модуль M4 = |A4| = 1 м/с2
Прикрепленные файлы:
5
Это самое лучшее решение!
04.09.2019, 10:20
общий
это ответ
Здравствуйте, dar777!
Модуль ускорения максимален на том интервале времени, на котором график зависимости
имеет наибольшую крутизну, или модуль тангенса угла наклона [1, с. 54]. Как видно из Вашего графика, наибольшая крутизна имеет место на участке 2 (от 10 до 20 с), где a=|(20-(-20))/(20-10)|=4 (м/с2).
Ось ординат на Вашем графике я счёл равномерной.
Литература
1. Элементарный учебник физики. В 3 т. / Под ред Г. С. Ландсберга. Т. 1. -- М.: "ШРАЙК", "В. РОДЖЕР", 1995. -- 608 с.
Модуль ускорения максимален на том интервале времени, на котором график зависимости
имеет наибольшую крутизну, или модуль тангенса угла наклона [1, с. 54]. Как видно из Вашего графика, наибольшая крутизна имеет место на участке 2 (от 10 до 20 с), где a=|(20-(-20))/(20-10)|=4 (м/с2).Ось ординат на Вашем графике я счёл равномерной.
Литература
1. Элементарный учебник физики. В 3 т. / Под ред Г. С. Ландсберга. Т. 1. -- М.: "ШРАЙК", "В. РОДЖЕР", 1995. -- 608 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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