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blar now im wondering whether or not satellites in low earth orbit actually decelerate instead of "accelerate" ...........

mm i dont quite get the car link >.<

haha and u kno how much prior sheets are worth guardian? lolz i dun think ppl wud like it if it was given out :p

ohh how come when a spacecraft re-enters they sometimes "retrofire" or aim their rockets ahead of them so they 'slow down' instead of speed up wots the point of that if its already supposedly decelerating as it goes lower?

quoting from 3 pages earlier in jacaranda "as a satellite slows, it loses altitude and begins a spiral downwards. As it descends, it encounters higher density air and higher drag, speeding up the process" and using the orbital velocity = sqrtt GM/r say M = 4, r = 2 (of course this isnt...

ok for low orbit satellites it increases in velocity as it goes lower and lower because of the forces of friction caused by the molcules of the atmosphere and the atmosphere becomes more dense as it gets lower too so it will accelerate rite? i dont understand why for re-entry dotpoint, why...

oHHH!! i get it now... thanks!!

anyone?

ohhh thx keypad ummm just a few more questions >=\ 1)¹⁰C_k / ¹⁰C_k-1 2)Simplify (sqrt(2) + 1)⁴ +(sqrt(2) - 1)⁴ 3^The expansion of (1 + ax)ⁿ is given by 1 - 24x + 252x² - ... Find a and n bah...

90 somethin for commerce

ahhh thx evilc.... abdoo... u cleared everything up :)

oops wot i meant was the answer is 20.. yes i can get that but wut i dont get is the books working out saying that it simplifies to 6C3 which simplifies to 20

yes i know how to get 20 :rolleyes: i dont get how the books answer simplifies it to ⁶C₃ on the next line tho...

⁵C₂ + ⁵C₃ = ⁶C₃ ok i know they both equal to 20 how does the LHS simplify to give RHS :confused:

oooo icic mmm yea.. mayb i shud ask a teacher for using Br2 thx :D

ok so if i used bromine water as br2 wud it be Cyclohexane and Bromine Water C6H12 (l) + Br2 (aq) --> C6H11Br (l) + HBr(aq) Cyclohexene and Bromine Water C6H10 (l) + Br2 (aq) --> C6H10Br2 (aq) :)

wow thx a lot! :)

thx ab :)

mm also i thought bromine water was Br2...

so basically something that is polar is aqueous ?