Physics: Post your doubts here!

[robotic94]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_ms_23.pdf

q1 c ii how is it v is ¼ of the distance?

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_23.pdf
Q1 d
Please explain me with the triangle method!

Ok

as you can see from the diagram I rearranged the forces but didn't change the direction
the angle between T1 and T2 is 90 because T1 is at an angle of 50 to horizontal and T2 at 40 to horizontal
and the angle between 7.5N and t=T1 is 40 because it is vertically downwards so is perpindicular to horizontal

to find T1 and T2 use trignometery

hope it helped

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_ms_23.pdf

q1 c ii how is it v is ¼ of the distance?

paper please

 

[shaadhir]

Hey can u tell me any gud book or any websites to learn waves i'm pretty weak at it

 

[Idolfanatic95]

Hey can u tell me any gud book or any websites to learn waves i'm pretty weak at it

http://www.s-cool.co.uk/a-level/physics
Try this

 

[shaadhir]

http://www.s-cool.co.uk/a-level/physics
Try this

thanx =)

 

[Unicorn]

Hey can u tell me any gud book or any websites to learn waves i'm pretty weak at it

http://www.physicsclassroom.com/Class/waves/

 

[Idolfanatic95]

S11 22;
We know that frictional force always acts along the plane. Never at an angle to it. Therefore the frictional force acts along the line AB. Since we know
Work done= Force x distance. The distance AB is found by using 4.1/sin30. Hope it helps

S11 23:
Since the wave is a stationary wave all particles between 2 nodes are in phase. Since X abd Y are in phase the phase difference is 0 (as they are between 2 nodes)

Hope it helps you
cheers

Helped
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w07_ms_2.pdf
Can u help me wid Q 1 (b) Im not getting the uncertainty in R right . .

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_qp_2.pdf
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_ms_2.pdf
Q2 (d) How do we do it?
Q4 (d) ii= Range in the ms in 41-48 degree. I'm getting 55 degree :-s

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w06_qp_2.pdf
Q7 (b) i= Correct answer is I3=I2+I1
But ain't I3 entering a point too (at Y)? :-s

 

[Idolfanatic95]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w05_qp_2.pdf
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w05_ms_2.pdf
Q 4 a (ii) My answer is 0.032. Correct one is 0.031 with uncertainty of 0.001m.
So how do we calculate it? anyone??

 

[Idolfanatic95]

If anyone can do Q1 (b) here, please..
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s04_qp_2.pdf

 

[Unicorn]

Helped
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_ms_2.pdf
Can u help me wid Q 1 (b) Im not getting the uncertainty in R right . .

ok the rules for dealing with uncertainity are

when adding/subtracting 2 terms togther ADD ABSOULTE error
When multiplying/dividing 2 terms togther ADD PERCENTAGE error
when a term is to a power of something say x^2 then MULTIPLY PERCENTAGE error with power

in the case multiply it with 0.5

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s07_qp_2.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s07_ms_2.pdf
Q2 (d) How do we do it?
Q4 (d) ii= Range in the ms in 41-48 degree. I'm getting 55 degree :-s

for question 2 you have
accn = 2.5 x10^15
time = 2.4 x10^-9
intial speed= 5 x10^7

and u know that the electron is launched halfway between the plates so the distance between it and the plate is 1.5/2 =0.75

using equation of motion= s= ut +(at^2)/2 you get s to be 0.1272 which is much less than 0.75 so no it does not hit it

for question 4 ur diagram is probably wrong draw it again

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w06_qp_2.pdf
Q7 (b) i= Correct answer is I3=I2+I1
But ain't I3 entering a point too (at Y)? :-s

yes but if u look closely you'll see that both E1 and E2 are producing I3

 

[angelicsuccubus]

if you guys gave p33 and had the whole -ve/+ve gradient debate going on.. I figured it out. Posted the explaination on the phys prac thread in case you're still curious:

http://www.xtremepapers.com/community/threads/how-was-physics-paper-33.15229/

 

[raamish]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_qp_23.pdf

in qs 4b(iv) the 3rd part my calculations are dis what is wrong: V=IR, 2.1-0.24*1.8=0.432V

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_23.pdf

in qs 4b(iv) the 3rd part my calculations are dis what is wrong: V=IR, 2.1-0.24*1.8=0.432V

there is no 4b(iv)

 

[raamish]

there is no 4b(iv)

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_23.pdf

oh sorry wrong ppr here u go

 

[Unicorn]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_23.pdf

oh sorry wrong ppr here u go

honey are you ok? there is still no 4b(iv)