These are really parts of questions. http://noether.physics.ubc.ca/physics153/assign22k5.pdf for number 2, i'm getting 264000kPa, but somehow it just doesnt seem rite, so if you guys can check for me, that'll be great. the other one i dont get is the second part of questions 4 where it asks for a time difference. can anyone help me out here? thanks!