Physics: Post your doubts here!

[ZaqZainab]

Can someone help me with this question....how do you calculate the resultant force?

Your doubt
and i don't exactly have forces notes but i did have trouble in forces this helped

 

[ZaqZainab]

Hey guys, can someone help me with notes on forces....

 

[1357911]

Explaination for this question plzView attachment 36310

Link to this question please?

 

[1357911]

any clue why are the 2013 physics a levels exam papers not available on xtreme papers?

http://maxpapers.com/category/qualifications/international/cambridge/a-level/a-level-physics-9702/

 

[Igcse stuff]

Your doubt
and i don't exactly have forces notes but i did have trouble in forces this helped

Thanks alot!!!!

 

[Igcse stuff]

Hey guys, what are you supposed to do in order to finish physics P1 P2 P4 and P5 without running out of time, and also getting A* overall?

 

[Hassan Ali Abid]

Hey guys, can someone help me with notes on forces....

Consult Pacific book 1,
Or any mechanics book cz if it will definitely let you to have stronger hand on forces and work,energy power etc ..
or see the vids of DRPHY on youtube ..

 

[Hassan Ali Abid]

Hey guys, what are you supposed to do in order to finish physics P1 P2 P4 and P5 without running out of time, and also getting A* overall?

Just focus on P4 as it is having the max weightage and try to score maxx marks ..like around 80-85 in this paper and you can easily get an A* or if you are having less time then you can only prepare the application part well along with other two topics like magnetism and quantum or heat ch ...and then give you max on P2 so this will easily let you to score atleast an A.
For paper 5 , you only have to memories the mark schemes or 3-4 specific papers and copy pasting that things in any paper can make an A in that component too ..

 

[RoOkaYya G]

someone help me with rms value problem solvings...

if theres notes on it or anythng plz send me the links...

thnk u

 

[Hassan Ali Abid]

someone help me with rms value problem solvings...

if theres notes on it or anythng plz send me the links...

thnk u

from sinusoidal wave u have to multiply the peak voltage with underroot 2 to get the value of either Ir.m.s or Vr.m.s.

 

[RoOkaYya G]

from sinusoidal wave u have to multiply the peak voltage with underroot 2 to get the value of either Ir.m.s or Vr.m.s.

yea i knw tht...but the thng is tht it gets complicated in word problems..

 

[Hassan Ali Abid]

yea i knw tht...but the thng is tht it gets complicated in word problems..

calculating the Irms from sinusoidal wave graph is different from square wave graph thats why u must be having the problems...
there's another way to calculate the Irms for square wave which is not given in the coursebook so first understand that method and then try to solve the questions.

 

[RoOkaYya G]

actually is nothin to do with a graph....its like a situation is given....weve to use rms...

ill upload a sample then help me with it,can u?

calculating the Irms from sinusoidal wave graph is different from square wave graph thats why u must be having the problems...
there's another way to calculate the Irms for square wave which is not given in the coursebook so first understand that method and then try to solve the questions.

 

[Eye catcher]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_22.pdf
q2-b,c Please fast

 

[Hassan Ali Abid]

actually is nothin to do with a graph....its like a situation is given....weve to use rms...

ill upload a sample then help me with it,can u?

rms is used when ever the AC voltage or current is given,...
yes sure ...i'll see in to it ..

 

[RoOkaYya G]

rms is used when ever the AC voltage or current is given,...
yes sure ...i'll see in to it ..

ok
ty...ill upload the word problem soon

 

[Eye catcher]

View attachment 36357
question b: the time the ball falls before the photograph is taken??

If you read the question it says :
The scale shows the distance fallen from rest by the ball. At time t = 0, the top of the ball
is level with the zero mark on the scale. Air resistance is negligible.

On the diagram above, it tells the initial position of the ball in photograph. Therefore, the distance, the ball fell before the photo was taken was 79 cm ( 0.79m)

therefore, s= 0.5*a*t^2
0.79=0.5*10*t^2
t = 0.4 s


question c: the time interval during which the photograph is taken???
therefore,
s= 0.5*a*t^2
0.90=0.5*10*t^2
t = 0.03s

ty

 

[Igcse stuff]

Just focus on P4 as it is having the max weightage and try to score maxx marks ..like around 80-85 in this paper and you can easily get an A* or if you are having less time then you can only prepare the application part well along with other two topics like magnetism and quantum or heat ch ...and then give you max on P2 so this will easily let you to score atleast an A.
For paper 5 , you only have to memories the mark schemes or 3-4 specific papers and copy pasting that things in any paper can make an A in that component too ..

Thanks a lot Hassan!...for P4 does it help to memories the mark schemes as well?....and in P5 are you supposed to answer in point form or paragraphs?

 

[Faithix MFSH]

Answer is D.
Please someone do provide a concise explanation without skipping of any points.
Quick help would be appreciated.

 

[ZaqZainab]

Answer is D.
Please someone do provide a concise explanation without skipping of any points.
Quick help would be appreciated.

calculate the change in momentum every second.
I am not getting the exact answer but i am pretty sure my method is right
F = (change in momentum)/time
F=(mass*velocity)/time.
the mass is obtained by multiplying the area (through which the wind is flowing) x density of air x velocity of wind
you will get F= 475.2*33=15681.6
round it off and you get 16000N