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those were cathode rays! i think they are different than light??? also do u guys have sets of "skills" questions from photoelectric effect topic...i have an assessment on it tomorrow?

lol

how is light a particle and a wave??

is there any difference between reflecting and emitting?? having difficulty understanding quantum theory... also, i watched this video on youtube where this guy pours liquid nitrogen on an object and puts a magnet above it, it keeps levitating! how can this happen? this can only happen when...

what if they dont give u the final result..eg finding the answer rather than showing it?? u wouldnt know then i guess

legend i still dont understand when resistance is force or acceleration...some questions require it as force while others dont! and it can alter the final solution!

care to share the workin out???

lol i have this question in assessment tomorrow morning...but thanks for trying..ill ask my mate and hope it doesnt show up in the test! hahaaha

the answer for the velocity at the point of projection is u^2/ {sqrt [1+ (ku^2/mg)]} note the k in this answer doesnt include mass

can you just upload your working out if u dont mind?? i wanna see it! thanks if u can

i got a=-g-kv^2/m ???

anything? alright i got the following expression for x in terms of v... x=(m/2k).ln(ku^2+mg)-(m/2k)ln(kv^2+mg)...now they want the velocity at point of projection so i let x=0.. i end up with v^2=u^2 therefore v= -u ....where did i go wrong?? an

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a body of mass m is projected vertically upwards with speed u, air resistance is k times the square of the speed, where k is a constant. find the speed of the body when it is next at the point of projection. i got the answer as -u. But i think thats only possible where air resistance is...

sometimes you have to...but sometimes they just do it to annoy you...

thanks guys!

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i have a chemistry prac test coming up next week worth 30% (same as trials). -practical and a related skill will come from Production of Materials focus 3. (ethanol) skills and problem solving will come from- 1. Industrial Chemistry Option Focus 2 (equilibrium) 2. Chemical monitoring focus 3...

that rule only applies when there is a linear function inside the bracket. In your case it is a cubic...A better approach would be simply expand it and then integrate it which is straight forward expanding will give (x^7/7)-(x^4/2)+x .....put x=2 n u will get the answer!

you saw a shirt for $97. You borrowed $50 from dad and $50 from mom and finally bought the shirt receiving $3 change...You gave one dollar to mom and one dollar to dad keeping the remaining dollar to you... Now you owe $49 to dad and $49 to mom and have $1 with you.. so 49+49+1=99 WHERE THE...