Physics: Post your doubts here!

[a_wiserME!!]

View attachment 51140
answer the question plz

did u get the method for this?? if yes then pls post it here

 

[3l_general]

Can any one help me with pert b

 

[a_wiserME!!]

check at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-21.html

yeah thnx i got it

 

[a_wiserME!!]

check q10 at
http://physics-ref.blogspot.com/2015/01/9702-june-2013-paper-13-worked.html

the link given in q10 gives the explanation for some other ques not the one that i asked

 

[a_wiserME!!]

just scroll down. as stated, its solution 102

ohh sry and jazakallahu khair

 

[salvatore]

Two balls roll from rest down the same slope, but ball X reaches the bottom of the slope in half the time it takes Y. If ball X was accelerating at a m/s2, then Y's acceleration, in m/s2, was
A. ¼a
B. ½a
C. 2 a
D.4 a

Could someone please help me with the question above? Thanks

 

[ruby_fern]

Can someone please explain how the seperation of atoms is the cube root of the volume of each atom?? TIA
9702/22/o/n/09 ... question number 2.b)ii.2)

 

[dubi2pro]

need help!

i have 2 confusions in the fluid dynamics,

1. i knw all the forces on a ball moving downwards through a fluid, but what are the forces on the ball if it moves up through the fluid?

2. For calculating the Velocity for the ball falling/going up the fluid which formula should we use, there are 2 to use.

* v= 2*r^2*g (Ps-Pf)/9*viscosity

or

* v= F/6*pie(viscosity*radius)

 

[princess Anu]

.

 

[princess Anu]

..

 

[The Sarcastic Retard]

.

C ?

 

[awesomaholic101]

check at
http://physics-ref.blogspot.com/2014/11/9702-november-2009-paper-22-worked.html

tysm ... i needed that too

 

[Llamas]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s08_qp_4.pdf
Question 4, b2.

Can someone please explain this to me, I don't understand where the formulae are coming from and why we're using the method the mark scheme says to use.

 

[princess Anu]

yes. can u explain.

C ?

 

[ruby_fern]

check at
http://physics-ref.blogspot.com/2014/11/9702-november-2009-paper-22-worked.html

Jazaakallahu khairan

 

[Llamas]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_4.pdf

Question ten, part B.
Can someone please tell me exactly what is happening, what the 'gain' is, and what formula is used for the result?

 

[Llamas]

check qu 27 at
http://physics-ref.blogspot.com/2014/10/physics-9702-doubts-help-page-4.html

Thank you!!

 

[princess Anu]

check qu 27 at
http://physics-ref.blogspot.com/2014/10/physics-9702-doubts-help-page-4.html

Help please

 

[princess Anu]

Q14 shouldn't ans be C?

 

[The Sarcastic Retard]

Q14 shouldn't ans be C?

c = f * lambda
Wavelength is inversely proportional to f so we are asked to find greatest wavelength of UV radiation so we have to use lowest frequency of UV.
Hence 10^(-7) is the shortest " f " & c = 10^(8)
f = 10^(8-(-7))=10^(15)