sorry for asking ! but I don't understand the first question
You can use Adblock .. do you know how to install it !
for 2 .. I can't understand why v2 smaller than v1
You mean advertisments when you browsing the net !
if yes what is your browser ! ?
for 22 ... the answer in the model answer is 30 km !!
maybe they mean in question the distance from the eart's surface to the atmosphere
for 16 .. why I can't use this way !
nice alan .. so question 2 the answer is e ! right ?
and I want to ask ... from your amswer in question 6 I Concluded this law cos(npi + x ) = cos(x) ... n mean any Integer number ( 0 , 1 , 2 , 3 ....... )
nice ... I am grateful for you .. alan and david
Thanx david .. you are amaizng
now I want to ask about question 16 .. I saw that you have long discuss with alan .. and the English is not my mother language .. so I want some one explain to me the answer with simply .. why it is not specific heat capacity ...
Thanx
cos(npi + x ) = cos(x) ... n mean any Integer number ( 0 , 1 , 2 , 3 ....... ) 
