Physics: Post your doubts here!

[Sahil Gupta]

explain this please

 

[funky brat]

How do we do this? :'(

What's the answer? You can use dsintheta= n*wavelength where d=1/n.

 

[funky brat]

explain this please

See you have the horizontal component of velocity which is equal to ucostheta.Here it is given as 8.2. Using this and the angle cos60 evaluate u which is 16.5. Then for vertical component use formula usintheta using 60 as theta and 16.5 as u, you will get 14.2.

 

[funky brat]

So for this question there's a part (iii), which requires us to:

Calculate the current in the battery.

How do we the get the resistance as 2? :s The correct answer is 6 A.

emf is 12 and internal resistance is 0.5 which gives the current as 6 A. For resistance R=V/I where voltage is 12 and current is 6.

 

[Suchal Riaz]

Asif1223 =
I ∝ A²
for I to double, A² must double
so for A² to become double, A must be multiplied by √2
as
I2 = (√(2)A)²
I2 = 2A² but I = A² so
I2 = 2(I)

got it?
this is the thread to ask questions, that thread was not for questions. Please delete your post. here is the link to your post: https://www.xtremepapers.com/commun...ck-last-day-revision.32432/page-6#post-916940

 

[Studydayandnight]

emf is 12 and internal resistance is 0.5 which gives the current as 6 A. For resistance R=V/I where voltage is 12 and current is 6.

It gives 24 not 6. :/

Emf is 12, internal resistance is 0.5 so I=V/R which is 12/0.5 which is 24.

 

[Studydayandnight]

How do we do the 2nd question? :'(

answer is 4.93 ms^-2

Answer for the magnitude is 6.9 x 10^-5

HELPPPPPPPPPP

 

[amal sharkawi]

can anyone plz answer ???

 

[qdkhan]

can anyone please explain q3 b(III) in the following paper?
http://revision.peterhouse.co.zw/Ph... & Mark Schemes June & Nov/9702_s12_qp_21.pdf

 

[TheJDOG]

View attachment 53547
can anyone explain this plz???

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?

 

[Fate0]

Hello.
I was wondering if any of you could help or share some resource with me regarding Kirchhoff's Second (Voltage) Law.
I just cant seem to make sense of the sign conventions used. Is there any easier way of assigning signs. Any help is appreciated.

 

[tiki-taka]

any idea on calculating area under graph quickly without counting boxes for ages..
TheJDOG
Suchal Riaz
funky brat

 

[afrolina]

no. of significant figures for cie as level?

 

[qwertypoiu]

View attachment 53547
can anyone explain this plz???

Hi is this in A2 or AS???

 

[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?