Mathematics: Post your doubts here!

[Esme]

Hows preparation people? Generally speaking what type of questions you people think are difficult ? .....

If anything new and tricky comes up, I might have to exert more than usual thinking power lol
If questions similar to those in the past papers appear, then I'm fine I think..
How's your prep?

 

[AlishaK]

i've reached the point where i have no ability to think but you have to use Energy to get it cause you have height and mass and at point A K.E. is zero....i think, but i still might be wrong ... i'll just go sleep

okay thanks i guess?!
Best of luck for tomorrow thou.
Cheerio!

 

[Pie-man]

Hey! I like the number 2 better than 3. Or maybe I'm just making it up cause you mentioned it...haha ;P

didn't know my complexity can be transferred through the internet

 

[AlishaK]

didn't know my complexity can be transferred through the internet

it's seems pretty contagious!

 

[Esme]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_43.pdf
Q1 part ii. It's a bit absurd but just tell me. :/ Please! :')
Pie-man guess u have done this one?!

Work done by resistance = 0.6 x 5.6 = 3.36
Loss in PE = 0.8 x 10 x 2.5 = 20
Work done by driving force =0
0 = 3.36 - 20 + gain in KE
gain in KE = 16.64
0.5 x 0.8 x v^2 =16.64
v= 6.45

 

[Pie-man]

okay thanks i guess?!
Best of luck for tomorrow thou.
Cheerio!

thanks you too....

and btw i am probably right use energy to get it

 

[AlishaK]

Work done by resistance = 0.6 x 5.6 = 3.36
Loss in PE = 0.8 x 10 x 2.5 = 20
Work done by driving force =0
0 = 3.36 - 20 + gain in KE
gain in KE = 16.64
0.5 x 0.8 x v^2 =16.64
v= 6.45

Esme, you are like one of those ppl when someone's totally screwed up nd nobody knows what to do, you appear like 'Esme to the Rescue'...lol
Thanks a lot.
Cheers!

 

[AlishaK]

thanks you too....

and btw i am probably right use energy to get it

I'm supersaturated with mechanics...! I can fix a car now at 'kahar bayie sayyarat'...haha!

 

[D0cEngi]

here is the whole idea (or how i did it) just draw a vertical line at point B to get a letter Z, and by using trigonometry get the angles so you can make a resolution, then Tension c and Tension a will be equal to each other (with the sine and cosine of course) and 8 would be equal both added together.

then get the tensions by substitution between both equations.

Thanks but I'll appreciate if u draw a diagram also.

 

[ZainH]

June011 v.43 no.4 and no.5 please ,, Honestly they are the worst questions ever

Uhm, it'll be a bit hard to explain without drawing it ..
I can try but if you want me to draw it , it'll take a little longer :c

 

[GorgeousEyes]

Uhm, it'll be a bit hard to explain without drawing it ..
I can try but if you want me to draw it , it'll take a little longer :c

It depends on you have time or not

 

[ZainH]

It depends on you have time or not

I sorta don't , sorry D;
Lets just hope this question doesn't show up.
Try looking at the mark scheme maybe? You just have to use the graph for the answers.

 

[GorgeousEyes]

I sorta don't , sorry D;
Lets just hope this question doesn't show up.
Try looking at the mark scheme maybe? You just have to use the graph for the answers.

Okay fine thanks anw

 

[zain786]

AOA

guys can you please help me on hot to solve
May/June 2007 Paper P3
Q5_ii
Q7_i
Q8_ii and
Q10_iii

please explain them to me... know they are like 4 questions but they comealot and im having a little problem unerstanding them
heres link to Exam Paper
http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s07_qp_3.pdf

 

[drewrock]

cam sm1 hlp me in normal distribution sums.....

 

[Pie-man]

Thanks but I'll appreciate if u draw a diagram also.

i'n SO SORRY i didn't tag you in the last post with the diagram :/ ... it is an easy question dont worry i just hope you see it before the exam and good luck

 

[zain786]

Question 7 i:
View attachment 25944

OMG thankyu sooooooo much ur a life savour BRO!!

 

[AlishaK]

Using s=ut+0.5at^2, Hp=12t+0.5(-10)t^2 => Hp=12t-5t^2
Hq=7t+0.5(-10)t^2 => Hq=7t-5t^2
Given that 3Hp=8Hq, therefore, 3*(12t-5t^2)=8*(7t-5t^2), I hope you can take it further from here. t=0 or t=0.8s
Now using v=u+gt,
V of P at t=0.8s: v=12+(-10)(0.8), V of Q at t=0.8s: v=7+9-10)(0.8)....Hopefully it hits your brain.

Ahmedraza73 Here u go!!

 

[Ashik]

p3 O/N 2007
10.) The straight line l has equation r = i + 6j − 3k + s(i − 2j + 2k). The plane p has equation
(r − 3i).(2i − 3j + 6k) = 0. The line l intersects the plane p at the point A.
(i) Find the position vector of A.
(ii) Find the acute angle between l and p.
(iii) Find a vector equation for the line which lies in p, passes through A and is perpendicular to l.

I could solve (i) and (ii) but got stuck with (iii), somebody help me out, exams knocking the door, need the answer as soon as possible

In Addition:
If Possible please send some notes on
p3 : Complex numbers in polar form ( How to draw Argand Diagram from A to Z )
S1 : Permutation and Combination ( A to Z ) ​

 

[freezingfires]

PhyZac Can you please help me with November 2001 paper 6 Question 7.I'd be grateful if you gave a detailed explanation.Thanks!!
Here is the question:
A bag contains 7 orange balls and 3 blue balls.4 balls are selected at random from the bag,without replacement.Let X denote the number of blue balls selected.
i.Show that P(X=0)=1/6 and P(X=1)=1/2
ii.Construct a table to show the probability distribution of X.