Physics: Post your doubts here!

[Thought blocker]

NAHI yaar..! I never Meant Duffer :/,,! Plus U r Way Smarter than Me... (Ma sha Allah)!
I Just Was Amazed..! Never Met many People Having Libra! I m the Only One in My Family..!
And Sooryy For Late Reply !

Np

I M Fifteen ! U Cant Beat ME !
20/10/1998 ! I m not Joking!

u r 15 ??

 

[Farhana.sultana]

I need the mark scheme of physics for 2001 and 2002!

 

[sadiaali]

Please anyone me Q29. Thanls a lot in advance
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w02_qp_1.pdf

 

[kitkat <3 :P]

Please anyone me Q29. Thanls a lot in advance
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w02_qp_1.pdf

is the answer C?

 

[sadiaali]

is the answer C?

Yes, how did u get that please explain me.

 

[kitkat <3 :P]

Yes, how did u get that please explain me.

look u just have to use the formula
n*(lamda)=d*sin(theta)
where n is the order (its told the second order that means 2)
d is the spacing of lines (which we have to calculate)
lamda is the wavelength
put the values in the equation
2*(590*10^-9)=d*sin(43)
solve it u wil get 1.7

 

[sadiaali]

look u just have to use the formula
n*(lamda)=d*sin(theta)
where n is the order (its told the second order that means 2)
d is the spacing of lines (which we have to calculate)
lamda is the wavelength
put the values in the equation
2*(590*10^-9)=d*sin(43)
solve it u wil get 1.7

Oh, thank you

 

[ZaqZainab]

I need the mark scheme of physics for 2001 and 2002!

http://xtremepapers.com/community/attachments/marksc-1-pdf.12307/ 2001 winter
http://papers.xtremepapers.com/CIE/...A and AS Level/Physics (9702)/9702_w02_er.pdf this is the examiner report but it contain answers for MCQ 2001 winter

 

[Thought blocker]

Well Guys, kitkat <3 :P mehria
Mohammed salik


I am sorry for yesterday night.. I got it, it was v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v. SIMPLE I made it complicated, Abb shamajh aya hadu ne a ko 1 q liya tha...
I was so stupid, sorry for wasting your imp hours on this topic.

 

[kitkat <3 :P]

Well Guys, kitkat <3 :P mehria
Mohammed salik


I am sorry for yesterday night.. I got it, it was v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v.v. SIMPLE I made it complicated, Abb shamajh aya hadu ne a ko 1 q liya tha...
I was so stupid, sorry for wasting your imp hours on this topic.

its ok

 

[Thought blocker]

its ok

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w02_qp_1.pdf
Q 9
why not C?
it is t^2 so here t=(t2-t1)
Q10 why not D?
Q11 i thought it is C
Q14
Q21
Q32 R=V/I
so here I is infinite wont R be o??
because I=V/R and if I is infinite I=V/0??
I know there are so many but even if you help me out with one of this i will be great full

 

[kitkat <3 :P]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w02_qp_1.pdf
Q 9
why not C?
it is t^2 so here t=(t2-t1)
Q10 why not D?
Q11 i thought it is C
Q14
Q21
Q32 R=V/I
so here I is infinite wont R be o??
because I=V/R and if I is infinite I=V/0??
I know there are so many but even if you help me out with one of this i will be great full

Q9 the answer is D
firstly u have to find x
s=u*t+0.5a*t^2
X=0.5a*t1^2(u=o)

for the accelaration we are going to use complete hieght i.e.
x+h so
s=ut+0.5at^2 (u=0)
x+h=0.5*a*T2^2
put value of x
o.5*a*t1^2 +h= 0.5*a*t2^2
h=0.5*a*t2^2- 0.5*a*t1^2
(o.5=1/2 so on the other side it will becme 2 so it wil be 2h)
now 2h= a*t2^2 -a*t1^2
take a common
2h=a(t^2 - t1^2)
a=2h/(t2^2-t1^2)
hope u got it :/

 

[kitkat <3 :P]

for 10 isnt D th answer :O??
for 11 when the direction is opposit we add the force when same we subtract so A is the answer
ZaqZainab

 

[ZaqZainab]

for 10 isnt D th answer :O??

A is the answer

Q9 the answer is D
firstly u have to find x
s=u*t+0.5a*t^2
X=0.5a*t1^2(u=o)

for the accelaration we are going to use complete hieght i.e.
x+h so
s=ut+0.5at^2 (u=0)
x+h=0.5*a*T2^2
put value of x
o.5*a*t1^2 +h= 0.5*a*t2^2
h=0.5*a*t2^2- 0.5*a*t1^2
(o.5=1/2 so on the other side it will becme 2 so it wil be 2h)
now 2h= a*t2^2 -a*t1^2
take a common
2h=a(t^2 - t1^2)
a=2h/(t2^2-t1^2)
hope u got it :/

thanks

 

[ZaqZainab]

for 10 isnt D th answer :O??
for 11 when the direction is opposit we add the force when same we subtract so A is the answer
ZaqZainab

ua is going in opposite direction to ub
so ua-ub??
va is in the same direction to vb so va+vb?
why is this wrong

 

[Kamihus]

A is the answer


thanks

The answer is D

 

[ZaqZainab]

The answer is D

Opps my bad
My apologies

 

[kitkat <3 :P]

ua is going in opposite direction to ub
so ua-ub??
va is in the same direction to vb so va+vb?
why is this wrong

when the are in differentdirections one is postive the other one is negative while when the move in the same direction both are either positive or negative so when we put them in the formula we get that the velocities of the balls in different directio will be added while the ones in same direction will be subtracted

 

[ZaqZainab]

when the are in differentdirections one is postive the other one is negative while when the move in the same direction both are either positive or negative so when we put them in the formula we get that the velocities of the balls in different directio will be added while the ones in same direction will be subtracted

either positive or negative so why subtracted it can be added too? for v and subtract for u
I am not saying that A is wrong but why is C wrong?
why cant it be like the velocities of the balls in different direction will be subtracted while the ones in same direction will be added?