ALL CIE PHYSICS DOUBTS HERE !!!

[$H00t!N& $t@r]

Hey guys,

Can someone please help me with Q 17, 18, 21, 25 and 27 from o/n 2006 p1

Here is the link --->  http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FPhysics%2FCIE%2F2006+Nov/

[srk]

I have doubts in Physics/9702/Paper- IV:
May/June 2002, Q4(b) and Q7(c)
Oct/Nov 2002, Q2 (b)
and Oct/Nov 2009 Q11(c) i)
Awaiting your response..

[EMO123]

Hey guys,

Can someone please help me with Q 17, 18, 21, 25 and 27 from o/n 2006 p1

Q=17
ans= as 93 Joule of Energy is emitted as Thermal Energy and left 7 joule is emitted as light energy :. 7% is the efficiency of electrical energy is converted to light energy. :. A

[EMO123]

I have doubts in Physics/9702/Paper- IV:
May/June 2002, Q4(b) and Q7(c)
Oct/Nov 2002, Q2 (b)
and Oct/Nov 2009 Q11(c) i)
Awaiting your response..

you are only awaiting for the completing the diagrams

[Dania]

Hi! Can someone please help me out with this problem. I've been on it for a long time. The answer is 240 degrees. I only need the (a) part of the question. Thanks!

[EMO123]

Hey guys,

Can someone please help me with Q 17, 18, 21, 25 and 27 from o/n 2006 p1

Here is the link --->  http://www.freeexampapers.com/past_papers.php?l=Past_Papers%2FA+Level%2FPhysics%2FCIE%2F2006+Nov/

Q 18

4 MW is maximum is 80%.
Then 100% is 5 MW.

P = IV
5 X 10⁶   = I X 25 X 10³
I = 200 A


Q 25

Count the phase difference from X. 3 (Crest to trough) = 720 = 3 pie. n = 3.


Q 27

n X Lamda = d sin x

n = 1 (first order)
N = 500
d = 1/N
Lamda = d X sin x
              ------------
                    n

= (1/500) X Sin 30
= 1 X 10^-3 m

[EMO123]

Can anyone help in Q 21. There's a doubt for me too.

[HUSH1994]

Q21.Pressure of water = pgh = 1000*9.81*(2000-X)
Pressure of oil = pgh = 830*9.81*X
Total Pressure = 17.5*10^6 Pa(From Mega *one million)
17.5*10^6 = (19620000 - 9810X) + 8142.3X
(17.5*10^6) - (1.962*10^7) = -9810X + 8142.3X
-2.12*10^6 = -1667.7X
X = -2.12*10^6
      ------------   = 1270 to 3 sf
        -1667.7

Hope it helped                                                                                                                                              

[EMO123]

Q21.Pressure of water = pgh = 1000*9.81*(2000-X)
Pressure of oil = pgh = 830*9.81*X
Total Pressure = 17.5*10^6 Pa(From Mega *one million)
17.5*10^6 = (19620000 - 9810X) + 8142.3X
(17.5*10^6) - (1.962*10^7) = -9810X + 8142.3X
-2.12*10^6 = -1667.7X
X = -2.12*10^6
      ------------   = 1270 to 3 sf
        -1667.7

Hope it helped                                                                                                                                              

thanx but after sometime i just solved from my friend but i could not post that time
then also thanxx for the try

[HUSH1994]

its alright,no problem

[HUSH1994]

P1 Q27 ON 2002.
A wave of amplitude a has intensity of 3.0 Wm^-2
What is the intensity of a wave of the same frequency that has an amplitude 2a?
how come the answer is 12

[Vin]

Intensity is directly proportional to the square of the amplitude. Equate them using a constant to find k in terms of a. i.e k = 3/a^2. Then equate k for 2a to give 12.

[HUSH1994]

Thanks man +rep

[red_911]

hey can anyone answer this 
The amount of electrical energy transferred when a charge of 8 mC moves through a
potential difference of 12 V ??

[EMO123]

can anybody tell me a perfect definition of Stress and Strain