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Консультация № 202271
09.03.2022, 18:01
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3
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Здравствуйте! У меня возникли сложности с данной задачей: Плоское зеркало движется влево со скоростью v=10 см/с, а точечный источник S движется вниз с той же самой скоростью. Скорость зеркала перпендикулярна плоскости зеркала. Определите величину скорости, с которой движется изображение S? точечного источника. Ответ дайте в см/с, округлив до десятых.
Буду премного благодарен за помощь, уважаемые эксперты!
Буду премного благодарен за помощь, уважаемые эксперты!
Обсуждение
10.03.2022, 02:19
общий
Адресаты:
А Вы сами не хотите решить свою любимую задачу и стать Победителем? Это не трудно.
По определению: Скорость - это расстояние, делёное на время.
Начертите Изображение на Вашей картинке. Затем на этой картинке добавьте отъехавшее зеркало и смещённый вниз источник. Обозначьте его новое изображение. Вам останется разделить расстояние м-ду 2мя изображениями на заданное Вами время движения. Для задания интервала времени движения Вы можете использовать любое, удобное для Вас значение.
По определению: Скорость - это расстояние, делёное на время.
Начертите Изображение на Вашей картинке. Затем на этой картинке добавьте отъехавшее зеркало и смещённый вниз источник. Обозначьте его новое изображение. Вам останется разделить расстояние м-ду 2мя изображениями на заданное Вами время движения. Для задания интервала времени движения Вы можете использовать любое, удобное для Вас значение.
14.03.2022, 15:28
общий
это ответ
Попробуем обойтись без сложных формул, просто представив, что произойдёт с зеркалом, источником и его изображением в течение секунды. За одну секунду расстояние между зеркалом и источником увеличится на 10 см и, поскольку изображение расположено симметрично источнику относительно плоскости зеркала, то "расстояние" между зеркалом и изображением также увеличится на 10 см, а в сумме изображение сместится влево на 10+10=20 см. За ту же секунду источник переместится вниз на 10 см параллельно плоскости зеркала, следовательно, изображение сместится в том же направлении и на ту же величину. Таким образом, за 1 секунду смещение изображения составит 10 и 20 см вдоль двух перпендикулярных направлений, а полное смещение составит [$8730$]10[sup]2[/sup]+20[sup]2[/sup] = [$8730$]500 = 10[$8730$]5 [$8776$] 22.361 см, то есть скорость изображения равна примерно 22.4 см/с.
5
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