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Здравствуйте! Прошу помощи в следующем вопросе: Молекула распадается на два атома. Масса одного из атомов в n=3 раза больше, чем другого. Пренебрегая начальной кинетической энергий и импульсом молекулы, определить кинетические энергии T1 и T2 атомов, если их суммарная кинетическая энергия T=0,032 нДж.
В какой именно помощи Вы нуждаетесь? Если Вам нужна лишь идея, чтоб затем решить задачу своим умом, то подсказываю: Фраза Условия "Пренебрегая начальной кинетической энергий и импульсом молекулы" означает, что для расчёта можно принять равной нулю начальную скорость молекулы. В таком случае для решения задачи достаточно составить систему из 2х уравнений, олицетворяющих Закон сохранения Импульса m·V1 + (n·m)·V2 = 0 и Закон сохранения энергии T1 + T2 = T где T1 = m·V12 / 2 , а T2 = (n·m)·V22 / 2
Условие: суммарная кинетическая энергия разлетевшихся атомов T = 0,032 нДж = 32 пДж. Отношение масс атомов n = 3. Вычислить кинетические энергии T1 и T2 атомов.
Решение: Пусть масса m1 мЕньшего атома равна m . тогда масса бОльшего атома равна m2 = m·n = 3·m . Фраза Условия "Пренебрегая начальной кинетической энергий и импульсом молекулы" означает, что для расчёта можно принять начальную скорость молекулы равной нулю. В таком случае для решения задачи достаточно составить систему из 2х уравнений, олицетворяющих Закон сохранения Импульса m·V1 + (3·m)·V2 = 0[$8195$] [$8195$] (1) и Закон сохранения энергии T1 + T2 = T[$8195$] [$8195$] (2) где T1 = m·V12 / 2 , а T2 = (3·m)·V22 / 2[$8195$] [$8195$] (3)
Уточним, что атомы разлетаются в противоположные стороны, а не под косым углом, потому что начальный импульс молекулы равен нулю. А Закон сохранения энергии в текущей задаче не есть чисто-кинематический, кот-й работает в типовых задачах на соударение 2х тел. Здесь кинетическая энергия молекулы до распада равна нулю. И разлетевшиеся атомы получили кинетическую энергию от какого-то другого источника (радио-активный распад молекулы, бомбардировка супер-быстрой частицей с мизерной массой, намного меньшей массы m атома…)
В нашей системе из 2х уравнений слишком много неизвестных величин. Свяжем их, чтоб избавиться от ненужных переменных. Выразим эти "ненужные" ч-з искомые переменные. Обе части уравнения (1) разделим на m , а обе части уравнения (2) умножим на 2 и сделаем замены 2·T1 = m·V12 , 2·T2 = 3·m·V22 : V1 = -3·V_2[$8195$] [$8195$] (4) m·V12 + 3·m·V22 = 2·T[$8195$] [$8195$] (5)
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