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but from 80 to 99...that requires a really big jump to be made, does it not?

oh damnn...im screwed lol

cths

okay...i know im in year 11 but i really want to know how far i am from my goal of getting >99.5 .... i didnt do really good, but am still confused on how im going.. does anyone think its possible for me to get >99.5 by the HSC with these ranks..? Eng Advanced: Rank-65/254 , Mark: 71%...

yes... change in energy is = work done

Well.. from the formula P=VI we know that Potenial difference is the work done on a charge (ie work/q) and current is the flow of charge per sec (ie q/t) Sub the values in to the P=VI forumla.. u get P=(W/Q) * (q/t) --- when u solve this the q's cancel and u get P= work/time sub this...

There is a list of metals activity in the prelim course, metals...from that table u can determine what produces what... metals that react more easily (that only require cold water), K, Na, LI, Ba, Ca produce hydroxides, & the ones that need the presence of heat (ie steam) scuch as Mg, Al, Zn...

U have to know things used before industrial revolution , (water energy, domesticated animals, wind energy etc)...Then you should know stuff during/after industrial rev...coal, nuclear stuff like that... Why we are dependent? cuz we cant do heaps of things without them...like cook food, listen...

ohh K...now i get it :) Thanks heaps!!

Yeah, but howcome when a neutral rod and neutral silk come in contact, the rod becomes positley charged and silk negatively charged. If they were initially neutral, why does one become postively charged and the other negatively ?

how do u study for it? .... like what content do u need to know?

Hi, I hope someone can give me some feedback on what do they think of my perception of static electricty From my understanding when two objects are in contact there is a transfer of electrons. Now, what i dont get is that, why do they have to be neutrally charged objects in the first place...

How do u study for Umat...whats in it?

no... There will only be a few exceptions that are Covalent Lattice that you need to know for HSC. These would prbably be diamond, Si02, Graphite... and btw Graphite is Covalent Lattice, not molecular ..It is the only (i think) covalent lattice subastance that conducts electricty..:)

Hi, Can someone please explain the inversely proportional relationship between Electric Field Strength and Charge in E=F/q I understand that they are inversley proportional, but i cant visualise why? thanks

A trolley, of mass 3kg, moving at 8m/s, is acted on by a force of 15N until its speed doubles. What acceleration does the force produce, and how long does it act? Thanks!!

how did u do 20.2 *3 ? since the least amount of sig figs is 1 then shoudnt it be 60?

Just wanted to ask something When you multiply or divide in calculations you round of to least sig figs so would something like 20.2 * 3= 60 ? And if you are adding numbers how do u round off? like 40 +5.0 = ? Thanks!

Hi I had a question regarding absolute value equations and absolute value inequation. I understand that we can solve them graphically, but if we were to solve them algebraically then would you have to find 4 solutions to them or, just two. Or is it 2 for the absolute equations & 4 for the...

Hi can someone help with this question Solve y=x^2 +1 y=1-x^2 thanks!