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Задать вопрос экспертам

Консультация № 168907

04.06.2009, 01:43

0.00 руб.

0 2 0

Образование

Уважаемые эксперты!Помогите решить две задачи по физике.
1. Найти минимальную толщину плёнки с показателем преломления 1.33, при которой свет с длиной волны 0.64мкм спытывает максимальное отражение при угле падения света 30 градусов.
2. Затухающие колебания точки происходят по закону X=8e^(-бета t)sinwt.Найти смещение и скорость точки в момент t=0 с , а также в моменты времени когда точка достигает крайних положений.
Спасибо.

Обсуждение

Неизвестный

04.06.2009, 02:38

общий

Такае задачи лучше задавать в Решебник.
Эксперты в рассылках вряд ли будут решать задачи.

Неизвестный

04.06.2009, 18:14

общий

2.
смещение x(t)=8*exp(-[$946$]t)*sin[$969$]t
скорость v(t)=dx/dt=8*exp(-[$946$]t)*([$969$]cos[$969$]t-[$946$]sin[$969$]t)

в момент t=0
x(0)=0
v(0)=8[$969$]

точка достигает крайних положений, когда скорость становится равной 0
соответствующие моменты времени определяются из уравнения
[$969$]cos[$969$]t-[$946$]sin[$969$]t=0 или [$969$]/[$946$]=tg[$969$]t
t_k=arctg([$969$]/[$946$])/[$969$]+pi*k/[$969$], k=0,1,2,.....

в эти моменты времени
смещения x(t_k)=8*exp(-([$946$]/[$969$])*(arctg([$969$]/[$946$])+pi*k))*sin(arctg([$969$]/[$946$])+pi*k/[$969$]), k=0,1,2,.....

Форма ответа

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