Physics: Post your doubts here!

[Zepudee]

Hi guys. Can anyone explain to me how an alternating current can flow through a capacitor and not permit a steady direct current to flow through it?

 

[Bba321]

Hey I am appearing for Physics paper 33 and I wanted to know if we are supposed to write units for the gradient and y intercept or not?
Thanks

 

[JackAaron]

http://physics-ref.blogspot.com/2014/09/9702-november-2009-paper-42-worked.html

i think u gave a wrong paper. Its May/June 09 not Oct/Nov :s

 

[Bba321]

Hi what does answers to the nearest mm mean on a metre rule? Thanks

 

[Bba321]

Hi.Do we take readings in m , cm or mm in practical?
Thanks

 

[shaminou]

Hi.Do we take readings in m , cm or mm in practical?
Thanks

It depends on the question. When you read the question see the units where you are supposed to give the answer and give your readings to this unit.

 

[Bba321]

What about short practical? I think they don't give the units

 

[shaminou]

What about short practical? I think they don't give the units

Then take readings using SI units.

 

[RoOkaYya G]

Hi.Do we take readings in m , cm or mm in practical?
Thanks

in m is better unless it says cm there
depends on question requirement too
if not specified m is better

 

[Bba321]

in m is better unless it says cm there
depends on question requirement too
if not specified m is better

Thanks

 

[Bba321]

It depends on the question. When you read the question see the units where you are supposed to give the answer and give your readings to this unit.

Thanks

 

[Thought blocker]

*Coughs*

 

[SIstudy]

Here you go, NOW I AM OFF, I HAVE TO REVISE
View attachment 42473

how did yu do it like this, I mean why did yu draw the triangle this way :S

 

[Thought blocker]

how did yu do it like this, I mean why did yu draw the triangle this way :S

That's how we draw triangle. How do you draw it?

 

[SIstudy]

That's how we draw triangle. How do you draw it?

umm don't we draw it this way

 

[Thought blocker]

umm don't we draw it this way

I actually don't remember what I did. I need to read the question. Which paper is it?

 

[SIstudy]

I actually don't remember what I did. I need to read the question. Which paper is it?

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_21.pdf
Q2 B (ii)

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_21.pdf
Q2 B (ii)

Okay that part.
Here, I did that coz the graph was curved, how can you do like that? If it is curved your answer will be wrong. You obviously need to draw a tangent.
Um, its like drawing a tangent you get gradient here for curve graphs.

 

[SIstudy]

Okay that part.
Here, I did that coz the graph was curved, how can you do like that? If it is curved your answer will be wrong. You obviously need to draw a tangent.
Um, its like drawing a tangent you get gradient here for curve graphs.

I'm doin by tangent then im getting my answer as 2.25 which is out of range
the range given in mark scheme is 2.8± 1

 

[Thought blocker]

I'm doin by tangent then im getting my answer as 2.25 which is out of range
the range given in mark scheme is 2.8± 1

Should I explain it to you on board?
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