1. what do you like to do in the 1. what do you like to do in the country? 2. what do you like to do at the seaside? 3. what do you like to do in the city? 4, what do you like to do to at camp? 5. do you like your summer holidays? why?

Ilike to rest in the country. at the seaside i iike eating ice cream. in the city i like go walking with my friends. at the camp i like sleep in the tent. yes, i do. i like my summer holidays. it is so, because i have a realy nice rest and fun.

1.  logical - illogical:   her speech was so illogical 2.  responsible - irresponsible:   i've never thought he's such an irresponsible person 3.  believable - unbelievable:   the pain was inbelievable  4.  possible - impossible:   it's impossible to sleep when you are surrounded by noise 5.  active - inactive:   being inactive is not so good for your health 6.  balanced - unbalanced:   he became unbalanced after his dog died 7.  forgettable - unforgettable:   my wedding was an unforgettable occasion

дано:  

m=1 г=0,001 кг 

водород 

v₁=2v₂=v₃ 

t₃=t₁ 

найти  δs 

решение 

при адиабатическом процессе изменения количества теплоты не происходит. поэтому нет и изменения энтропии 

p₁v₁/t₁=p₂v₂/t₂ 

t₁/t₂=p₁v₁/(p₂v₂)=2p₁/p₂ 

адиабатический процесс описывается уравнением 



для двухатомного газа показатель адиабаты равен 7/5 





при изохорном   процессе:  

для двухатомного газа  cv=5/2  r 

δs=m/m cv ln(t₃/t₂)=m/m cv ln(t₁/t₂)=5mr/(2m)*(-2/5  ln2)=(-mr*ln2)/m 

молярная масса водорода m=0.002 кг/моль 

универсальная газовая постоянная r=8.31 дж/(моль к) 

δs=(-0,001*8,31*ln2)/0.002=-2.88 дж/k 

ответ: -2,88 дж/k