Physics: Post your doubts here!

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[talalz]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_11.pdf

its summer/11/2012... can any one explain mcq no, 4,8,12,15 .. please

thank you

 

[Tkp]

May june 11(12)-29,34,16,8

 

[Tkp]

May june 11(13)-27,14

 

[Tkp]

View attachment 28660

uncertainity should always be added and should be taken to 1sf
so 1.27-.83
and 0.02+0.01=0.03
so (0.03/.44)*100=6.8%=in 1sf its 7

 

[Tkp]

View attachment 28659

well what is the ans?d
if its d then stress =f/a
and the radius is1/4 and the area is 1/16
so f/1/16=16f
and the orginal 1s radius is 1/2 and area is 1/4 so stress is 4f so it increases to 4
and the strain=extension/original length
so diameter changes doesnt affect strain

 

[bogus]

put in values and you'll realise current increases ... its parallel combination remember!

Yaeh... okay thannks

 

[abrar]

Thank u soo much.....could u please explain these questions 2...
M j 2012 paper 11 question 12,18,23
M j 2012 paper 12 question 6,13,23,24,26,28,29,30.
May ALLAH bless u.

12) you need to know mechanics m1 for this method: 120g-t=120a and ( T stands for tension in rope which is constant)
t-80g=80a , add both equations t gets cancelled off and find a using g=10ms-2, use u=0 s=9m because at half way only the man's head is at the bottom of the barrel as acceleration is constant for both of them, find v using v^2=u^2+2as

q18) output energy / input energy
output is in power convert it into energy using p=E/t, pxt=E, and obviously input is 40Mj x 20

 

[Antalya]

I don't really have what you are searching for but I have the examinator's report. It includes all answers for June Paper 1 2002

Thank you so much, I owe you one

 

[haha101]

Amyone to solve these challenging, mind-blowing question?
View attachment 28655

Look . the wave p completes three complete cycles before meeting at point x . while Q completes 3,5 cycles . when you take the difference it is 3.5 - 3.o = 0.5 cycles which is Pi

 

[haha101]

View attachment 28656

Assume that one resistor is 2 ohms .
p=V2/R .
since voltage is same it will cancel out .
you will get :
resistance of series/ resistance of parallel
Rs=6
rp = 2/3
Divide n youll get the Ans .

 

[haha101]

View attachment 28657

Just the use of a basic principle .
Resistance = resistivity x length/Area.
Remember if length decreases then area increases . by the same factor .
Here the length is halved so the area will become twice of that as before .



For dia 1 : R1= l/A

For dia 2 :
R2=0.5l/2A

if we rearrange the eq for dia 1 then we get 4R2 = l/A

Substitute l/A to R1 : 4R2=R1

R1 = 8
4R2=8
R2=8/4 = 2 Ohms

Hope you got it

 

[haha101]

View attachment 28659

Is it D ?

 

[A star]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_1.pdf Q15? working pls

 

[A*(a*)]

Is it D ?

I thought it would be D, but its C

 

[haha101]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_1.pdf Q15? working pls

Yeah tou hogaya