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Physics paper 1 problems..

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nox_fjmoony:
So I was solving the physics paper-1 paper for may/june-2009 and I had problems with these questions:
1,5,6,7,15,18,20,27 and 29.

I'd really appreciate if you could explain these to me! Like I can't seem to arriving to the correct answer. Any help would most certainly be appreciated.
I'm attaching the question paper along with this post. Yeah.

I'd also appreciate some tips on finishing the exam within the 1hour time duration. : )
Thanks all.

thecandydoll:
I got more questions
OCT/NOV 2005

21 A wire stretches 8 mm under a load of 60 N.
A second wire of the same material, with half the diameter and a quarter of the original length of
the first wire, is stretched by the same load.
Assuming that Hooke’s law is obeyed, what is the extension of this wire?
A 1 mm B 4 mm C 8 mm D 16 mm

halosh92:

--- Quote from: nox_fjmoony on May 18, 2010, 10:53:06 am ---So I was solving the physics paper-1 paper for may/june-2009 and I had problems with these questions:
1,5,6,7,15,18,20,27 and 29.

I'd really appreciate if you could explain these to me! Like I can't seem to arriving to the correct answer. Any help would most certainly be appreciated.
I'm attaching the question paper along with this post. Yeah.

I'd also appreciate some tips on finishing the exam within the 1hour time duration. : )
Thanks all.

--- End quote ---

Q1) from km to m its *1000
from m to mm its also *1000
therefore from km to mm its *1000000
which is 10^6   so its D

Q5) its D
for the displacement-time graph  the slope is equal to the velocity
if u look at D...the slope increasing  which means the velocity is increasing and thats whats happeneing when the object starts falling its velocity increases....but in C the slope id decreasing which means that the velocity is decreasing which is wrong....and then for D the line is straight which shows that velocity is constant,

Q6) rememeber that only when the velocity is a HORIZONTAL STRAIGHT LINE then the displacement time graph would be in an INCREASING STRAIGHT LINE...so before "t1" its a straight line so exclude A
then...velocity is decreasing,...if u look at C its the only one which has a a straight line in the begginning and then a decreasing slope.....like i mentioned before decreasing slope of displacement-time graph= decreasing velcoity so its C

Q7) unless there is a force acting on the system then there is acceleration.......first law says: that the particle stays at rest or moves in a constant speed, unless a force act on it.

Q15)E=mgh
wen tap opens
half of y is filled
which means
m/2 n h/2 also
so it becomes
mgh/4
ans is B :)

halosh92:

--- Quote from: thecandydoll on May 18, 2010, 10:59:00 am ---I got more questions
OCT/NOV 2005

21 A wire stretches 8 mm under a load of 60 N.
A second wire of the same material, with half the diameter and a quarter of the original length of
the first wire, is stretched by the same load.
Assuming that Hooke’s law is obeyed, what is the extension of this wire?
A 1 mm B 4 mm C 8 mm D 16 mm

--- End quote ---


this is simple c :
F=Ke lets find K first
60=k /(8/1000)  divide by 1000 to change from mm to m
k=7500
since the forces used are same so we could use this:
F=Ke
let the new extension be "z"
ke=kz
7500* (8/1000)=7500 *z
60/7500=z
0.008 m=z
0.008 *1000= 8mm=z

hope u got it. :D

nox_fjmoony:
Hey Halosh, thanks a lot for the help! Though I still have some problems with understanding when a slope is decreasing and when it is increasing >_<

Could you please help out? Anyone?
Aaand, I also have trouble with question number 13 here, yeah.

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