Вопрос школьника по предмету Физика
рассчитайте изменение внутренней энергии 2 моль гелия при изобарном расширении от 5 до 10 л под давлением 200 кПа
Ответ учителя по предмету Физика
v=2 моль ΔV=5*10^-3 м3 p=2*10^5 Па ΔU=?
===
p=const
Q=(5/2)*v*R*ΔT=(5/2)*p*ΔV
A=p*ΔV
ΔU=Q-A=(5/2)*p*ΔV — p*ΔV=(3/2)*p*ΔV=3*2*10^5*5*10^-3/2=1.5*10^3 Дж
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