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Physics: Post your doubts here!

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can someone explain to me kirchoffs second law? even though i get it, im unable to solve the questions related to it.
 
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For question 26: I is directtly propotional to the Amplitude square
and the given propotionality is I is inversely propotional to the the distance X
Now forget this and understand what i'm saying: A Is directly propotional to B,and B is Inversely propotional to the C
so it will be equal to the A is Inversely propitional to the C
NO WHAT THE QUESTION SAYS
I is directtly propotional to the Amplitude square
the given propotionality is I is inversely propotional to the the distance X
SO THE THIRD PROPOTIONALITY WILL BE :
Amplitude^2 inversely proptional to dstance X^2
so a1^2 x1^2=a2^2 X^2
a1^2=8.0 micrometres
x1^2=r
x2^2=2r
a2^2=?
so putting the values we get a=4.0 micrometres
 
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For question 26: I is directtly propotional to the Amplitude square
and the given propotionality is I is inversely propotional to the the distance X
Now forget this and understand what i'm saying: A Is directly propotional to B,and B is Inversely propotional to the C
so it will be equal to the A is Inversely propitional to the C
NO WHAT THE QUESTION SAYS
I is directtly propotional to the Amplitude square
the given propotionality is I is inversely propotional to the the distance X
SO THE THIRD PROPOTIONALITY WILL BE :
Amplitude^2 inversely proptional to dstance X^2
so a1^2 x1^2=a2^2 X^2
a1^2=8.0 micrometres
x1^2=r
x2^2=2r
a2^2=?
so putting the values we get a=4.0 micrometres
thanks man
 

Tkp

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can someone please explain mcq 40 of winter 2012 paper 11
ok just see.isotopes are the atoms of the same element that has same proton number but different neutron number.so u can assume that p has a proton number of 60 and nucelon number of 90.do calculation and u will get b
 
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http://tinypic.com/r/34p1j61/6 can anyone solve this questions and tell me why the answer is A littlecloud11 einstein

Smith and Jones are skating on a friction less surface hence, there's no loss of energy before or after throwing the ball. The initial and final speed for both skaters should be the same. Only graph A shows smith and Jones returning to their original speeds after the exchange.
 
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Smith and Jones are skating on a friction less surface hence, there's no loss of energy before or after throwing the ball. The initial and final speed for both skaters should be the same. Only graph A shows smith and Jones returning to their original speeds after the exchange.
but the final speed in graph A is not same as initial speed of both skaters
 
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Smith and Jones are skating on a friction less surface hence, there's no loss of energy before or after throwing the ball. The initial and final speed for both skaters should be the same. Only graph A shows smith and Jones returning to their original speeds after the exchange.
sorry the correct answer is C
 
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Aslam-0-Alikum , Jamia
How is every-body, OK i m student of Heriot Watt Dubai, now a days i am doing DEP ( Degree entry Program ) for any engineering but i m going for مہندس مدني (civil). Pls try to post exam Past Papers of SQA Higher Physics, Eng, Math. formula sheets equal to As or A-Level , i don't know sub-codes of as or A-Level

Regards,

Smith,
Dubai
 
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i bought new physics cambridge international AS and A level course book course book , author David sang, graham jones, richard woodside and gruinder chadha
but in the cd they gave i couldnt find answers for the end of chapter and exam style in book so pls give the answers for this book questions
 

Tkp

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Asalam-o-Alaikum!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_13.pdf
could anyone please help me here with questions: 12, 26, 35 and 39??
thanks! :)
fr no.26 by doing calculation we get the number of order 3.then they are asking the number of images can be formed.so 3 images will be formed on x and 3 on z and a straight image through y
and 12 as it is an uniform meter rule the distance should be 50 and it is 10 cm from the pivot so
10*100+50*x=20*60
x=4,so to balance the rod it should be 4 m to the right.so ans is 44
 
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in order to strengthen her legs an athlete steps up on to a box and then down again 30 times per min . the girl has a mass 50 kg and the box is 35 cm high. the exercise lasts 4 min and as a result of the exercise, her legs muscles generate 120kj of heat . calculate the efficiency of the leg muscles (g=10ms-2)
ans:15%
how it came?
 
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