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Qu 18, Chapter 5 Review, Jacaranda If our galaxy, the milky way, is 20 kiloparsecs or 65000 light years in radius, calculate how fast a spacecraft would need to travel so that its occupants could travel right across it in 45 years. Okay...i've gotten this far... (see attached) i just...

The molar heat of combustion of ethanol is 1360kJ/mol. What will be the final temperature if 250g of water at 20 degrees celsius is heated by the combustion of 2.0g of ethanol if there is a 30% heat loss to the surroundings? I did it and got some whacked answer. Can anybody help with a worked...

aiiiight. thanks for that. just needed verification cause we have this stupid sub for the next week.

What do the monomers of these polymers look like?

p.s tim your working is really intense.

The answer is pi...so approx. 3.141 units^2

-Find the area bounded by the curve y = (square root of) 4-x^2, the x-axis and the y-axis in the first quadrant. Now it forms a semicircle with x-intercepts -2 and 2. So the area can be found by A=pi r^2/4 = pi x 2^2/4 =pi but can it be found by using the traditional finding the...

it was thrown down into the ground at an arbitrary angle... could i say it is unlikely but possible for the throwing and bounce velocities to be equivalent? it is a silly question to begin with...

So basically the prac involved bouncing a golf ball on cement, calculating the time of flight and range and making further calculations from there. Then i got the question: Is the initial velocity of the ball (after the bounce) the same as the velocity at which it was thrown - and could we...

Try the teacher's resource books on the Belonging Area of Study. I can't recall the exact names of them right now but your librarian should have a clue.

The 20th term of an arithmetic series is 131 and the sum of the 6th to 10th terms inclusive is 235. Find the sum of the first 20 terms. How would i go about attacking this? cheers.

omfg. just realised i got the very first one wrong. i put 8 x .7 = .56 idiot. lol did alright in the rest though. can't help but feel like a half-wit atm. lol

yeh because the cut he made was along the diagonals of 3 different faces. that makes it equilateral. yes? i hope so. cos i put 60. lol

haha 'year 10, pens down' someone up the back of the room yells 'TITS!!!' supervisor looked horrified...never found out who it was...lol

lol yeh our teacher this year was a new polish guy with a funny moustache. all i learnt all year was how to smuggle a cactus through customs. had to borrow a text book and teach myself...with help from the head of HSIE. omfg remember the first q on maths today? 8x0.7 i put 0.56 i feel...

nothing overly great happened in my exam room. but i thought it was funny when they described the chick in Hitchcock's 'birds' play as hatless. lol. reminds me of the simpsons... Wiggum "suspect is hatless, i reapeat, hatless" Homer "I hope they throw his hatless ass in jail" lol...made...

oh i remember it now. just reading the thread and panicing cos i thought i missed a page lol. i put 'chemical'...thats why i hate those free responses...cause there are like 80 correct answers but only one CORRECT answer.

lol come to think of it that graph one should have been the straight line. because if the ramp remains at a constant slope, the acceleration would not increase, right? it would be the velocity increasing. oh well...that makes it 99/100 so far =( lol.

i put A going to the left and B and C going down.. that was my guess. lol.

thankyou for that. i'll put it to good use. but when asked about the nature of something, does that mean describe what it is? or pro's and con's kind of thing?