Physics: Post your doubts here!

[ShreeyaBeatz]

PAPER5 doubts,
So for question 2, we obtained gradient and y-intercept, the questions after that, are we suppose to use raw gradient and y-intercept in calculations, or the round up gradient and y-intercept? Thanks guys!

This is of paper 5
when we throw a magnet in a vertical coil , how to make the speed uniform in all parts of its vertical motion? The markscheme says -
1.Use of short magnet so that v is (nearly) constant
2. Use short/thin coil so that v is (nearly) constant
WHY? HOW?

 

[Mohammed salik]

This is from paper 1...and the answer is v=underoot (g x lambda)...but HOW?

If u Convert Quantities into Base Units.. The Check If Right Hand Side Equals LEFT hand Side..! If it does then Equation is true And Valid..! If u Couldn't The I would Explain Further !
Hope i Helped !

 

[Zain Javaid]

guys what are the formulas for calculating uncertainities in the table of Question 2 P5, and please help with the rest relative information too so that i must hav any problem solving those question. gradient uncertainities always go wrong

 

[A star]

what is the word POT mean i am sick of seeing this in every paper

 

[scouserlfc]

what is the word POT mean i am sick of seeing this in every paper

POT is actually power of ten error.

What does FOX mean any idea I've seen that as well in P5 ms ??.

 

[A star]

POT is actually power of ten error.

What does FOX mean any idea I've seen that as well in P5 ms ??.

meaning???

 

[A star]

This is of paper 5
when we throw a magnet in a vertical coil , how to make the speed uniform in all parts of its vertical motion? The markscheme says -
1.Use of short magnet so that v is (nearly) constant
2. Use short/thin coil so that v is (nearly) constant
WHY? HOW?

so that magnetic field lines are evenly spread out

 

[Zepudee]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_12.pdf

Q4,5,28,29,34,37,40!! HEHEHEE

 

[scouserlfc]

meaning???

Are u asking me what FOX means then I have no idea either it's pretty annoying it normally in ms is in the answer for y intercepts so I guess it's ant using false origin axes like they don't use origin on graph for at least x axis and u read the graph at this point thinking it's the y intercept so then u do FOX error I guess.

For POT error it's like when u have to calculate gradients and those sly CIE people have put the unit for an axis as let's say on the x axis they put mass/10^-6 kg. and in gradient calculation u forget this and don't include 10^-6 then u have done POT error and normally they do allow ecf for both POT and FOX but in some cases they don't.

 

[scouserlfc]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_12.pdf

Q4,5,28,29,34,37,40!! HEHEHEE

Don't have time will help with 4 .
Just use SI units of the axes.
Power x time
Js^-1 * s
J = joules
There is only one answer for energy so it's A.

 

[psychiatrist]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s05_qp_1.pdf
Q7,9,20,22,24,25,27,33.... Please

 

[roxy roro]

can someone help me please ? paper5 physics A2 ... if a = 6.6 x 10^-2 ± 0.1 and a^2 = 44 x 10 ^-4 how do we calculate the absolute uncertainty in a^2 ?? it is paper 52 may june 2013

 

[Zain Javaid]

table me uncertainities nikalnay ka kia formula hai ?

 

[roxy roro]

table me uncertainities nikalnay ka kia formula hai ?

what ?!

 

[MissBellum]

R = 750 ± 20
find lnR and its absolute error?
How would you find the uncertainty with a logarithm?

 

[roxy roro]

R = 750 ± 20
find lnR and its absolute error?
How would you find the uncertainty with a logarithm?

which paper is this ?

 

[MissBellum]

which paper is this ?

Question 2, May/june 2008, paper 5

 

[waztaz123]

Absolute uncertainty should be ln770 - ln750 and take it to 1 sig figure.

 

[MissBellum]

Absolute uncertainty should be ln770 - ln750 and take it to 1 sig figure.

where did ln770 come from?

 

[MissBellum]

oh wait, i get it, thanks