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Author Topic: Physics Discussion HERE ONLY!  (Read 32786 times)

Offline Wahab09

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Re: Physics Discussion HERE ONLY!
« Reply #15 on: June 04, 2009, 11:30:45 pm »
57 was 100% correct my friend!!
im the incorrect one.

i said i forgot to divide refractive index by 1 like u did :-[
but oh well.. 1 mark
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Offline emi

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Re: Physics Discussion HERE ONLY!
« Reply #16 on: June 04, 2009, 11:48:03 pm »
hey wahab can u tell me how did u calculate the mass ? like what method you used ?

and one of my friend mentioned the way of using thread and winding the  plastic and such for Q 1 ,, will it be correct ?

what was the answer for the last last Question  it had one line with 2 mars

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Offline Wahab09

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Re: Physics Discussion HERE ONLY!
« Reply #17 on: June 04, 2009, 11:54:53 pm »
emi..
you just rearrange the equation to hald of everything u had in a but without the mass.. and make the mass the subject..
it becomes 3750
it was just 1 mark or 2 u dnt need the working for it..

and many people did the winding thing and i dont think its correct cuz they sed they wanted specifically the measurment of only one of the peices..
u cudve used calipers or a micro meter

the last question i wrote from negative to positive (aint sure)
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Offline Eamyzz

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Re: Physics Discussion HERE ONLY!
« Reply #18 on: June 05, 2009, 01:44:58 am »
i did evrythng as u guys dd and in da first q i used da alpha emitter and i said 2 put an alpha emitter and put infront of it a paper and behind it a detector and then i said depending on da no of alpha rays able to penetrate da paper and detected by da detector the thickness can b determined if too many rays pass dat means its very thin if nothing passed that means its very thick....is it right? did any1 do it like me ?
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Offline noor92

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Re: Physics Discussion HERE ONLY!
« Reply #19 on: June 05, 2009, 04:13:36 am »
Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
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Offline Triple_A

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Re: Physics Discussion HERE ONLY!
« Reply #20 on: June 05, 2009, 04:16:42 am »
i wrote the fraction 4/5.......... :(
i didnt take 10% for the 2nd day............o crap!! :-\
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Offline zmnigcse

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Re: Physics Discussion HERE ONLY!
« Reply #21 on: June 05, 2009, 04:45:27 am »
Quote from: noor92 on June 05, 2009, 04:13:36 am
Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something

Well that's kinda like the thing. I did that first too. and then i realised that the ray that's coming out of the medium A is bending AWAY from the normal  :-\
So I decided to switch the fraction. I think you can use 1/refractive index, OR sin r/sin i... i remembered that cuz i saw it in the mark scheme of some old paper 
yes and i think it was 57 or something like that...  :D

The paper was actually QUITE challenging...   :(

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Offline sandydandy

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Re: Physics Discussion HERE ONLY!
« Reply #22 on: June 05, 2009, 05:12:37 am »
I think i must have lost 10 marks on the question of the kinetic energy. i did loss of potential energy is gain of kinetic energy so instead of using a half mv squared, i used mgh!! someone help am i completely wrong?? i also wrote A for the diode question. Question 1 first variant paper.. who knows the answer..
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Offline leebux101

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Re: Physics Discussion HERE ONLY!
« Reply #23 on: June 05, 2009, 05:42:08 am »
who agrees with me tht this ppr was hard......i did the second variant......it was soooo hard....i am gna loose soooooooooooo many marks...and i am the best one in class in physics..i always get full in it...i messed up big time... :'(
i came home and i burst out crying.....i am still so depressed....
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Offline joe kath

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Re: Physics Discussion HERE ONLY!
« Reply #24 on: June 05, 2009, 05:47:11 am »
man...i agree wid u....it wz pretty hard....bt some questions were lil easy....so i'll lose less marks...no worries...by da way bakhtawar....wich skool do u study in...???
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Offline leebux101

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Re: Physics Discussion HERE ONLY!
« Reply #25 on: June 05, 2009, 05:52:20 am »
i study in saudi arabia in a city called jubail....the school is called jubail international school or al hussan academy....but y r u asking???......yeah the skul has two names...lol    but still y r u asking?
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Offline Friends

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Re: Physics Discussion HERE ONLY!
« Reply #26 on: June 05, 2009, 06:02:23 am »
Quote from: noor92 on June 05, 2009, 04:13:36 am
Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
U r wrong dude .the answer like 58 or near to it. Ur Eqution is wrong its sinr/ sin35
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Offline sweetie

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Re: Physics Discussion HERE ONLY!
« Reply #27 on: June 05, 2009, 07:06:15 am »
Quote from: notty_me on June 04, 2009, 08:08:53 pm
i got sumthin like 323kg
and i mess read da fraction que but i got 0.77% so i found % instead of fraction
newayz i think its ok

wa was ur first ans???????
i rote micrometer guage!!!!!!!
and i scribbled so much in a que , but ans was clear
is scribbling ok??????

to find da mass did anyone use  mgh=0.5mv2 (25m was given )??????????????//

plzzzzzzz tel me do xaminers mind bout untidy paper???????????????
« Last Edit: June 05, 2009, 07:10:46 am by notty_me »
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Offline leebux101

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Re: Physics Discussion HERE ONLY!
« Reply #28 on: June 05, 2009, 07:37:54 am »
no they dont!!! thts the least of our worries.........i am not asking any of my questions...cuz if i do and then if i get the wrong answer i will be even more depressed......
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Offline idk

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Re: Physics Discussion HERE ONLY!
« Reply #29 on: June 05, 2009, 08:20:44 am »
hey guys i had a few doubts and was hoping any1 could answer them about the phy p3 yesterday-
1)micrometer screw gauge working explanation
2)the milk question especially the last part
3)fraction of the energy question
4)the road forces question-direction of the force.
5)the last question beta particle deflection and the second part.
thx guys.Take care all.
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