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ALL CIE PHYSICS DOUBTS HERE !!!

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$!$RatJumper$!$:

--- Quote from: Deadly_king on November 13, 2010, 01:48:02 pm ---I guess am ready for p1.  :)

But since am sitting for A2, i would be having p5 as well. And this paper is not as easy. I'll have to work out some more.  ;)

How about you?

--- End quote ---

Yeha i still need to clear up a few doubts .. but best of luck buddy! :)

TJ-56:
Can you help me with the following p1 MCQs;

S03 Q20

S04 Q25

W05 Q34

Thankx for the help in advance!

TJ-56:

--- Quote from: $!$RatJumper$!$ on November 13, 2010, 06:59:32 pm ---W06 P1
Q 9, 10, 15, 21 (urgent), 25, 26, 27, 32

Thank you :)

--- End quote ---

Q9

Horizontal component: using cosine, will give us u cos angle , since acceleration of free fall acts normal to the horiz. motion, u cos angle is the correct answer
Vertical: here we use sin to calculate the vertical component (opposite/adjacent), and so its u sin angle, and since we need to take the acceleration of free fall into consideration, we include -gt. I hope that was clear.


Q10

F=ma,

the resultant force MUST be in the same direction as the acceleration, so B. I think thats all to this question.

Q15

Using the parallelogram rule, or we could find the length of the dotted line (by length i mean force), then multiply it by 2. So to calculate this force: 10 cos(30) (the dotted line) * 2 = 17.32 N
17.32 - 10 = 7.3 (the resultant force).

21

Since the total pressure is 17.5 MPa:
17*10^6 = Pressure exerted by oil +Pressure exerted by water
              = 830*9.81*x + 1000*9.81*(2000-x
Solving for x would give 1270m
And hence the answer is D


25
I have doubts about this question as well, sorry.

26
 A smaller gap would give a greater diffraction,
http://www.knowledgerush.com/wiki_image/7/70/Diffraction.png

27
n lambda = d sin theta
n=1 theta=30
so lambda=d*0.5
and we have lambda*D=ax
D=1 and x=500d
so lambda=500d*a
solving simultaneously gives a=10^-3 so C

32

As R=V/I which is 1/gradient on the graph;
A filament lamps resistance increases as the temperature increases if the resistance increases then the gradient decreases and so D is the correct response.

Hope that was helpful

$!$RatJumper$!$:
WOW! :) Thank you so much! +rep

$!$RatJumper$!$:

--- Quote from: TJ-56 on November 13, 2010, 07:02:51 pm ---Can you help me with the following p1 MCQs;

S03 Q20

S04 Q25

W05 Q34

Thankx for the help in advance!

--- End quote ---

For S04 Q25

You need to remember this:

Node to Antinode = Downward (NAD)
Antinode to Node = Upwards (ANU)

:)

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