Physics: Post your doubts here!

Z

zackle09

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Tkp said:
for 22 apply the formula of Young modulus
FL/AX=E
SO WE Need to find the change in length
f=20,a=pie*(5*10^-4/2)^2
e=2*10^11
u will get 5*10^-4
and for percentage multiply by 100
Click to expand...


i had the same question..im not getting 5*10^-4 :/
and they havent given us extenstion either
 
TaffsAsLevel

TaffsAsLevel

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Any one understand the diagram for November 2010 paper 51? How do you draw it? It says coil Y is winded up tightly around coil X? How's that possible and mark scheme says there should be two independent coil labelled X and Y? Please help
 
Farru

Farru

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TaffsAsLevel said:
Any one understand the diagram for November 2010 paper 51? How do you draw it? It says coil Y is winded up tightly around coil X? How's that possible and mark scheme says there should be two independent coil labelled X and Y? Please help
Click to expand...

its a simple transformer :/

the pic I have uploaded shows the 2wires winded..
plus the bold wire shows wire y, and the other one is x..

if u gt ths diagram abt how they will wind up.lemme know, othrwse I will make the whole diagram..
:)
 

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Farru

Farru

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Farru said:
its a simple transformer :/

the pic I have uploaded shows the 2wires winded..
plus the bold wire shows wire y, and the other one is x..

if u gt ths diagram abt how they will wind up.lemme know, othrwse I will make the whole diagram..
:)
Click to expand...

also the wires shuld not touch each other!
 
A

athaan

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I'd like a clear explanation about fission of nuclei. I can't seem to get it right.

(90 38) Sr -> (90 39)Y + (0 -1) e + 0.55MeV

why would it release energy if the binding energy of Y is greater than Sr? I'd understand if Sr has greater binding energy, but in fact it does not.
I'm trying to look for an answer that doesn't have to do with the binding per nucleon energy graph. Is binding energy negative or positive?
 
Y

Yousif Mukkhtar

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gary221 said:
9) when the mass is at the lowest point, its kinetic energy = 0.
hence its velocity is also = 0 m/s
that means, either B or D.
since the first part of the graph shows the "UPWARD" velocity of the mass, hence the ans is D
Hope u gt it!
All credit to Nibz
Click to expand...

Jazakallah alf kheir
 
F

freezingfires

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Can anyone plz tell how the newtonmeter is used in finding the force b/w two charged plates in winter 2006 paper 5 question2? are there any weights added?plz explain IT'S URGENT!!
 
Mustafa Malik

Mustafa Malik

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Hello everyone
I am new to this part of Xtremepapers cuz i hv just finished my O levels n in these vacations i wanna study for A levels .Although i created a thread but there was no reply. Actually i need the name of the best books for Physics A levels that most renown skools follow.​
 
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Yousif Mukkhtar

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Mustafa Malik said:
Hello everyone​
I am new to this part of Xtremepapers cuz i hv just finished my O levels n in these vacations i wanna study for A levels .Although i created a thread but there was no reply. Actually i need the name of the best books for Physics A levels that most renown skools follow.​
Click to expand...

I recommend the CIE Endorsed Physics Coursebook. Its really simple to read, with good explanation!

I heard that Pacific A Level Vol 1 and 2 are also good
 
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