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Добрый вечер)Помогите пожалуйста с решением задачи: Атом распался на две части массами m1=1,6*10^-25кг и m2=2,3*10^-25кг. Определить кинетические энергии T1 и T2 частей атома, если их общая кинетическая энергия T=2,2*10^-11Дж. Кинетической энергией и импульсом атома до распада пренебречь.Спасибо)
Обсуждение
Неизвестный
18.11.2010, 21:42
общий
21.11.2010, 01:15
это ответ
Здравствуйте, Дима Елисеев!
Из условия задачи T1+T2=T Учтя, что T=(m*V2)/2 получаем (m1*V12)/2+ (m2*V22)/2=T Так как атом до распада покоился m1*V1+ m2*V2=0 V1=(- m2*V2)/ m1 (m1* m22*V22)/(2*m12)+ (m2*V22)/2=T V22=(2*m1*T)/( m22+ m1*m2) T2= (m2*V22)/2=(2*m1*m2*T)/(2 *(m22+ m1*m2))= (m1*T)/(m2+ m1) T1=T- T2 T2=(1,6*10-25*2,2*10-11)/(2,3*10-25+1,6*10-25)=9,03*10-12 (Дж) T1=2,2*10-11-9,03*10-12=13*10-12 (Дж)
Приложение: Из условия задачи T1+T2=T Учтя, что T=(m*V^2)/2 получаем (m1*V1^2)/2+ (m2*V2^2)/2=T Так как атом до распада покоился m1*V1+ m2*V2=0 V1=(- m2*V^2)/ m1 (m1* m2^2*V2^2)/(2*m1^2)+ (m2*V2^2)/2=T V2^2=(2*m1*T)/( m2^2+ m1*m2) T2= (m2^2*V2^2)/2=(2*m1*m2*T)/(2 *(m2^2+ m1*m2))= (m1*T)/( m2+ m1) T1=T- T2 T2=(1,6*10^(-25)*2,2*10^(-11))/(2,3*10^(-25)+1,6*10^(-25))=9,03*10^(-12) (Дж) T2=2,2*10^(-11)-9,03*10^(-12)=12*10^(-12) (Дж)
Неизвестный
20.11.2010, 12:25
общий
20.11.2010, 17:22
это ответ
Здравствуйте, Дима Елисеев! Связь Энергии и массы с кинетической энергией E=mc^2=mv^2 //И что из этого следует? v=c ??? Или это должно было быть выражение полной энергии E=mc2+mv2/2 ? В релятивистском случае оно выглядит совсем по-другому E=mc2/[$8730$](1-v2/c2), а в нерелятивистском складывать энергию покоя и кинетическую энергию смысла нет. В данном случае ситуация нерелятивистская, поскольку кинетическая энергия на 3 порядка меньше энергии покоя, при том, что массы даны лишь с 2-мя значимыми цифрами - релятивистские поправки будут гораздо меньше погрешности данных. M+Mv^2=M1+M1v1^2+M2+M2v2^2 //сложение массы и кинетической энергии??? 1) хоть бы на с2 массу умножили; 2) кинетическая энргия равна mv2/2 - кто на 2 делить будет? 3) Совмещение кинетической энергии и энергии покоя в одну формулу имеет смысл только если нам даны массы покоя всех частиц с достаточной точностью, и требуется найти общую кинетическую энергию Mv^2 --> 0 Задача решается от обратного ... т.е. при обратном движении эти частицы должны остановиться. т.е. M1V1^2=M2V2^2 => Кинетическая энергия разделится поровну Т1=Т2=Т/2=1,1*10:-11 Дж //Ну а это Вам кто сказал? Если что и равно, так это импульсы частиц (и равны они только по модулю, а направления их противоположны). Поэтому при различных массах кинетические энергии будут различны А если бы атом до распада двигался ... то общий бы центр массы этих двух или более частей продолжал бы двигаться с той же склрлстью и в том же направлении ... Успехов ...
Ваше решение непонятно. Потрудитесь, пожалуйста, над расстановкой скобок. Поясните, что такое M?..
С уважением.
Об авторе:
Facta loquuntur.
Неизвестный
20.11.2010, 16:28
общий
M - это масса так же как и m. В физике принято массу тел обозначить m, а массу атомов M. А M1 и M2 - это соответственно массы первого и второго осколка. А скобок ровно столько же сколько в исходном тексте.
И это только видимая часть айсберга, то есть математическая сторона вопроса. А ведь есть ещё и физическая, о которой Вам сообщил администратор рассылки...
Об авторе:
Facta loquuntur.
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