Physics: Post your doubts here!

[Bilal Khan]

There is a way to change from decimal to binary and binary to decimal,
Here you go changing binary to decimal is a but more confusing, tell me ill try to explain more , are my answers correct though?

For binary 0101 you have to do this to convert to decimal number :
2^3 x 0 + 2^2 x 1 + 2 x 0 + 2^0 x 1 = 5

 

[Amandaissocoollike]

can someone explain errors and uncertainties to me? my notes are missing and i cant figure out how to calculate % errors, actual errors etc.

 

[Bilal Khan]

Hi is this in A2 or AS???

A2 . In Application portion .

 

[qwertypoiu]

A2 . In Application portion .

alright thanks.

 

[TheJDOG]

For binary 0101 you have to do this to convert to decimal number :
2^3 x 0 + 2^2 x 1 + 2 x 0 + 2^0 x 1 = 5

Yep, what I did we should ignore the 2^0 under the 0 bits.

 

[qwertypoiu]

Hi this is 2014 ON paper 23 question 6 (c).
Please help, shouldn't terminal p.d. be less than emf due to lost volts?
The question mentions the other way around?

 

[omg]

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Hi this is 2014 ON paper 23 question 6 (c).
Please help, shouldn't terminal p.d. be less than emf due to lost volts?
The question mentions the other way around?

length is directly proportional to resistance. length increases , resistance increases so PD across the component increases

 

[TheJDOG]

View attachment 53591

can anyone plz answer ???

Here you go there are equations you need to memorize for this topic

 

[qwertypoiu]

P

length is directly proportional to resistance. length increases , resistance increases so PD across the component increases

Pd across the wire increases that's true.
However does the terminal pd of cell y refer to this?

 

[nehaoscar]

View attachment 53609

View attachment 53610

Hi this is 2014 ON paper 23 question 6 (c).
Please help, shouldn't terminal p.d. be less than emf due to lost volts?
The question mentions the other way around?

It's because the resistance increases as length increases, so the terminal pd increases
Note that it is higher than emf of cell Y ; the emf of the total circuit will be higher than this pd as cell X is also supplying a current.

 

[iYuuki]

For binary 0101 you have to do this to convert to decimal number :
2^3 x 0 + 2^2 x 1 + 2 x 0 + 2^0 x 1 = 5

You can also use a calculator to convert it though. Just change it to base mode, press the button BIN, key in 0101 then press the DEC button

 

[princess Anu]

what's the definition of electric potential energy?
is it
1energy stored in a charge available to do work in electric field OR
2energy stored in a charge due to its work done against electric field?

 

[DESTROYER1198]

does anyone have any revision notes

 

[DESTROYER1198]

does anyone have topical past papers

 

[omg]

does anyone have topical past papers

https://www.mediafire.com/folder/rfw3aib5cakfi/Physics_topical_AS_P2

 

[nehaoscar]

what's the definition of electric potential energy?
is it
1energy stored in a charge available to do work in electric field OR
2energy stored in a charge due to its work done against electric field?

i think it's the first one; cause it's the energy stored right?

 

[nehaoscar]

Someone please summarise brownian motion
and also radioactive decay ; all we need to know for p2
; like what is spontaneous and all that please!

 

[BhaiArshad]

Q2 b) ii) How do we find separation?
http://freeexampapers.com/A-Level/Physics/CIE/2009-Nov/9702_w09_qp_22.pdf

 

[omg]

Someone please summarise brownian motion
and also radioactive decay ; all we need to know for p2
; like what is spontaneous and all that please!

Radioactive decay of a nucleus : Nucleus emits alpha or beta particle
Spontaneous decay : decay unaffected by environmental changes such as temp , pressure
Random Decay : Constant probability of decay per unit time of a nucleus. Cannot predict which particular nucleus will decay
Brownian Motion : Random movement of particles

 

[princess Anu]

help with a ii (2,3)plzzz