Physics: Post your doubts here!

[Silent Hunter]

i)Amplitude is 7.6mm which you can see it from the graph (the highest displacement)
ii) 180 (This is 180 because, one graph is completed in 80cm.....So in 80cm 360 degree is completed. So there is a phase difference of 40cm between the point. So it is half of 80com and hence it is half of 360, which is 180.......Or you could use this formula- (40/80)*360 which is the normal formula of phase difference)
iii) V=frequency * wavelength
= 15 * 0.8
=12
(b) This one i have to show you by drawing....if you are interested then i can show you
(c)
i. Zero (Since they are on the same wave and phase)
(ii)
Antinode- A region in which two amplitude are at its highest point in opposite direction
Node- A region where two waves intersect and have no displacement

(iv) Again, i have to draw this...if you are interested then i could give a separate PDF for this by drawing in computer

Yep. i also want the graphs

thanks alot

 

[Wanzi21]

hello!
does anyone have full sheet of formulae for Physics(AS) in here??

 

[BilalAthar]

Could anyone explain june 10/23 Q.2c and Q.3 http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_23.pdf

 

[hmlahori]

please someone answer the question i have posted above on this page its the second time i posted them !!

 

[Saad Sarfraz]

Okay so please help me on this sum 09 paper 21 Q5B

 

[iKhaled]

need help in May/June 2011 paper 21

question 3 c) iii
question 6 b)..

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf

 

[Secret Crowds]

howa leh ben7ot 1.66 x 10 power -27 feh so2al no.3 b, i , november 2009 9702/21

 

[Unicorn]

Could anyone explain june 10/23 Q.2c and Q.3 http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_23.pdf

just ree arrange the forces for question 2c

then use sine rule

and which part of question 3

 

[Unicorn]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_qp_21.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_ms_21.pdf
Q 2(b) and Q 6(a ii) Can someone show exactly how these both are drawn? i have read the mark scheme and examiner report but i might be thinking it is drawn some other way entirely so just to verify my own drawings.

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_ms_21.pdf
Q 7(b) in this i also want to confirm if my drawing is correct so if someone else can show the correct one..

here you go love

 

[Unicorn]

Okay so please help me on this sum 09 paper 21 Q5B

post the paper

 

[Unicorn]

howa leh ben7ot 1.66 x 10 power -27 feh so2al no.3 b, i , november 2009 9702/21

english please

 

[Yousuf Ykr]

need help in May/June 2011 paper 21

question 3 c) iii
question 6 b)..

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_21.pdf

Any force increases if you apply that force from a distance. More the distance, more the force increases. Thats why we use a can opener to open the coke bottle. As it has a handle, it provide a distance and hence the force increases. similarly, the question asked that, what could make the weight increase its force...... The weight can increase its force if the if it is moved rightward as it gives a greater distance from the pivot

 

[Unicorn]

need help in May/June 2011 paper 21

question 3 c) iii
question 6 b)..

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_21.pdf

for question 3cii move the pivot closer to the end of the ruler so that weight of ruler has more momentum since momentum =f x s greater s means greater momentum

6b)
molecules collide with the walls
molecules exert equal and opposite force on wall
pressure is averaging effect of many collisions

 

[Secret Crowds]

english please

i need help in november 2009 9072/21 no 3 , b , i

 

[Unicorn]

i need help in november 2009 9072/21 no 3 , b , i

kinetic energy= 0.5mv^2

mass of a rest proton= 1.67x10^-27 as given in data sheet above
therefore v= sqrt(1 x 10^-12/0.5 x 4 x 1.67^-27)

hope it helped

 

[freakybandi]

june09 vairant paper 1.....qs 5 b??? plz help!!

 

[Yousuf Ykr]

yes please attach the graphs for both parts.

The red wave represent the phase after 0.25T....Since it is 0.25, it means that the two graph has a phase difference of 1/4 since 1/4= 0.25
It means that the next graph would be one fourth ahead.... And what is the one fourth of 80? It would be 20....so the new graph would complete one complete wave 20 steps after the old graph and that would be 100 as 80+20=100

If it helped anyone then can some one help me with my probs.....
m/j 2007- 5b (ii)
m/j 2011 21- 2c(i) 5 (ii)b
m/j 2011 22 5b(ii) 6(ii)1

 

[Yousuf Ykr]

Yep. i also want the graphs

thanks alot

The red wave represent the phase after 0.25T....Since it is 0.25, it means that the two graph has a phase difference of 1/4 since 1/4= 0.25
It means that the next graph would be one fourth ahead.... And what is the one fourth of 80? It would be 20....so the new graph would complete one complete wave 20 steps after the old graph and that would be 100 as 80+20=100

If it helped anyone then can some one help me with my probs.....
m/j 2007- 5b (ii)
m/j 2011 21- 2c(i) 5 (ii)b
m/j 2011 22 5b(ii) 6(ii)1

 

[Secret Crowds]

kinetic energy= 0.5mv^2

mass of a rest proton= 1.67x10^-27 as given in data sheet above
therefore v= sqrt(1 x 10^-12/0.5 x 4 x 1.67^-27)

hope it helped

thanx

 

[Secret Crowds]

thanx

but since kinetic energy = 0.5mv^2
= 0.5 ( 4u) v
so why did i put 4 and 1.66x10^-27
and why didnt i put the u with 4 as in 4u