Physics: Post your doubts here!

[hassam]

ASA,
i have many questions regarding paper 5. can anyoneplease tell me:
1) what is meant by error bars?
2) what is meant by worst acceptible line?
3) how do u calculate the error in the gradient?
4) how do u calculate the error the tabulated values which u have to calculate?
Also any notes on the apparatus and their use and how to write different kinds of experiments would be greatly appreciated!

 

[rz123]

Yep, the ms is wrong. The graph also shows a positive gradient of the I-V graph., so it's somewhat proportional, if not direct.

thanks. a guy uploaded dez worksheets here nd they also come along with the Cambridge endorsed book in a cd..
already uploaded worksheet 1 so rest r below with marking schemes..

 

[usmiunique]

Thnx a MILLION... May ALLAH bless u with success both in this world and in the hereafter!
I owe u one!

 

[hassam]

Use the first law of thermodynamics to explain why the specific latent heat of
vaporisation is greater than the specific latent heat of fusion for a particular
substance.

 

[XPFMember]

Use the first law of thermodynamics to explain why the specific latent heat of
vaporisation is greater than the specific latent heat of fusion for a particular
substance.

Assalamoalaikum wr wb...

Here's what my book says: Volume changes associated with evaporation are much greater than those associated with melting. The external work done is much greaater during vaporisation, and thus latent heat of vaporisation is much greater than latent heat of fusion.

 

[XPFMember]

aoa!
I got a doubt in nov 2011 paper 4 Q:3 b ii
ms says thermal energy is derived from energy of oscillation of the magnet

i dont understand :s

 

[Tatenda]

thanks. a guy uploaded dez worksheets here nd they also come along with the Cambridge endorsed book in a cd..
already uploaded worksheet 1 so rest r below with marking schemes..

Can you post the answers to chapters 17 upwards please

 

[Duanoor]

hey...i did o levels and thn opted for fsc...i am struggling with a question...can u guys hlp me??
we read that in solids speed of sound is greater cz its density is greater...but this formula v=E/density says that velocity is inversely proportional to density!!!!can u pls hlp me out??

 

[Duanoor]

another question when we make a solution of two miscible liquids the boling point of the solution is effected...now ignore that whether it increases or decreases but the whole sol. has a uniform boiling point...if it is so then how we will perform the process of fractional distillation????

 

[Duanoor]

....koi mujhe answer kreeeeee???

 

[smzimran]

Can someone help me with Q 3 c ii?
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s07_qp_2.pdf

ratio of volumes : ratio of lengths = 3:1
because volume = (length)^3

 

[smzimran]

hey...i did o levels and thn opted for fsc...i am struggling with a question...can u guys hlp me??
we read that in solids speed of sound is greater cz its density is greater...but this formula v=E/density says that velocity is inversely proportional to density!!!!can u pls hlp me out??

What is E?

 

[smzimran]

another question when we make a solution of two miscible liquids the boling point of the solution is effected...now ignore that whether it increases or decreases but the whole sol. has a uniform boiling point...if it is so then how we will perform the process of fractional distillation????

the whole solution cannot not have uniform boiling point. It is the property of the pure substance...​

 

[Duanoor]

What is E?

modulus of velocity

 

[Duanoor]

modulus of velocity

forget about it!its a property of matter...density ko dekho!!!!!

 

[smzimran]

modulus of velocity

Is this specific accoustic impedance?

 

[farhan143]

Can u explain me what is meant by a (vector component ) and ( horizontal component ) ? And how to find it for different conditions??

 

[smzimran]

Can u explain me what is meant by a (vector component ) and ( horizontal component ) ? And how to find it for different conditions??

http://www.s-cool.co.uk/a-level/phy...n/revise-it/resolving-vectors-into-components
Check this out

 

[farhan143]

i'm so sorry i meant to say (vertical component ) instead i said vector how foolish of me.........................either way thnks 4 the link

 

[farhan143]

Are the revision notes provided my xtremepapers for AS only or is it for A2 as well?
and are they a good source to study from??
cuz i printed it and i wnted to knw whether it is a good source or not