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Author Topic: A2 physics p5  (Read 15457 times)

Offline hafza89

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Re: A2 physics p5
« Reply #60 on: May 20, 2009, 01:57:31 pm »
it was an ok ppr.. except i didnt know the "e".. my answer is 2e , e and 1/2 e
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Offline khagga_926

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Re: A2 physics p5
« Reply #61 on: May 20, 2009, 02:02:36 pm »
it wz tat where da springs were parallel we had to add them like v do wid resistors in series and when they springs were in series v have to do like v do wid resistors in parallel....100% right
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Offline khagga_926

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Re: A2 physics p5
« Reply #62 on: May 20, 2009, 02:03:49 pm »
da Q1 of P5 was same as p5 in 2005...except then da p5 wz a practical and now its written and dey used da steel ruler than and now they used the wood ruler
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Offline naveed1234

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Re: A2 physics p5
« Reply #63 on: May 20, 2009, 02:07:36 pm »
p5 was kinda ok....minimum 25/30.. ;D
By the way the gradient shud be multiplied by 10^5

and did anyone get their y intercept positive???then its WRONG 100% cuz the x-axis starts from 1.5...it doesnt start from zero...dats da only mistake i made.... >:(
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Offline khagga_926

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Re: A2 physics p5
« Reply #64 on: May 20, 2009, 02:17:53 pm »
u had to use y=mx+c to fynd da y-intercept....now plx every1 stop posting in this topic paper still goin on many countries....so topic until atleast 6 hours
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Offline tulip

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Re: A2 physics p5
« Reply #65 on: May 20, 2009, 02:34:21 pm »
Just wanted to know,
incase if anyone has any idea,
I wrote to answers for gradient, and i guess the right one is 1.29 x 10^5, and thats one of my answers.
So will i get the marks?

What did you people get the value for min force and the distance between the fringes?
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Offline khagga_926

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Re: A2 physics p5
« Reply #66 on: May 20, 2009, 02:38:17 pm »
just wait for atleast 6 hourx b4 u get da answer.....
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Offline tulip

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Re: A2 physics p5
« Reply #67 on: May 20, 2009, 02:47:35 pm »
Oh sorry, sh*t, i forgot that we werent suppose to give out the answers.
But just tell me about this,
that do we get marks if we write two answers and one of them is the right one?
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Offline khagga_926

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Re: A2 physics p5
« Reply #68 on: May 20, 2009, 03:06:47 pm »
yea u get da marks but u lose da mark of da answer
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Offline inuyasha

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Re: A2 physics p5
« Reply #69 on: May 20, 2009, 03:10:41 pm »
who has done physics p32 and math p3?
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Offline M4@li

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Re: A2 physics p5
« Reply #70 on: May 20, 2009, 07:36:41 pm »
guyz naveed1234 mentioned dat we had to multiply the gradient wid 10^5....i was abt to do the same thing in my paper but i think it is rong.....
U see....the table was smthng like this (i am not sure of the value but they were around the ones i rote)

(10^-5) ... lg d(10^-5)              And to calculate gradient we had to subtract two lg d values(of course) and this value was the
31                1.49                     denominator....any way the point is 1.49 - 1.15 = 0.34.............There is no need to do anything with
.                                              10^5.... i tell u why. if u use 31 X 10^-5 and use this full value to calculate its log, then it is -3.51 and
.                                            similarly for for 14 X 10^-5 we get its log as -3.85. If we subtract the two...-3.51-(-3.85) we get the
14                1.15                   same answer which is 0.34........

So dats why i THINK dat there is no need to multiply the gradient value wid anything....cuz we'll get the same answer either we use full value or the other. Anyway my gradient value was 1.27....and the constant p was smthng around 2.4 (and its postive) to get the value of p we had to do the inverse log of y-intercept......Neway.now next is Pure Mathemaics... :-\
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Offline usman_leo4

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Re: A2 physics p5
« Reply #71 on: May 20, 2009, 08:08:56 pm »
Yeah i totally agree wit M4@li...
They had mentioned (10-5) jus to confuse us...
Whoever used 10-5, has made a big mistake...
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Offline sahi1990

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Re: A2 physics p5
« Reply #72 on: May 20, 2009, 09:11:44 pm »
ya me 2 ................i also agree , they made us confused . ....my gradient was also 1.27 ........most of the student wrote 10^5 with their gradient .........which is wrong ............but dont worry  try to make ur next paper better.................. best of luck  .
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Offline mac

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Re: A2 physics p5
« Reply #73 on: May 21, 2009, 04:50:46 am »
 :o OH CRAP!!!!!! Haha...u know when i calculated the gradient i ended up with ~1.27 and remembered about the o/n 08 paper since it had d^2/10^-4 on the y-axis. So in yesterday's paper i saw the lg(d/10^-5)  in the graph's x-axis. Then i scribbled the gradient +/- error  and put down 10^5 after the entire value of gradient!!!!  Do u think they are going to penalize POT (power of ten)? In O/N 08 P5 mark scheme they say don't penalise POT! it will prob. b just 2-3 marks lost, right??? :-\

I really regret this now!!!! They def. would hav confused a lot of ppl who done the O/n 08 paper!
I shud have remembered that 0/n 08 paper didn't  hav logs...  :-\ :P :P
I hope Q1 takes care of this mistake!

Is the grade threshold gonna b higher this time?? In O/N 08 it was +22/30 for A!!!
« Last Edit: May 21, 2009, 04:52:19 am by mac »
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Offline M4@li

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Re: A2 physics p5
« Reply #74 on: May 21, 2009, 12:00:43 pm »
yeah... these cie ppl try to play evry trick in the book to confuse us....

anyway can smone tell me dat in the last part what were we supposed to rite the values of p and q....the value of q was the value of gradient itself which we calculated earlier or we had to do smthng else to obtain q....

The gradethreshold will prbly be arnd 23 this time...(most of my class mates including me found q1 easy...)
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