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Physics: Post your doubts here!

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GUYS HOW ARE U ALL?
PLZ I NEED UR HELP IN PHYSICS...I NEED TO KNOW THE PERFECT TEXT BOOK TO STUDY FROM........ :p ............AND ALSO WAT SUBJECTS DO U ADVICE ME TO TAKE IF I AM GOING INTO MEDICINE FIELD. :D

PLZ NAOTE THAT I NEED 4 AS SUBJECTS AND 3 A LEVELS :)
 
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http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_23.pdf

PLS HELP! >_< does anyone know how to calculate the area under the graph for question 3? :(

Make an appropriate line just under the curve that covers most of the boxes. The Shape formed would be a Trapezium. Calculate the are for trapezium by 1/2 x height x sum of parallel sides.
Now remains the boxes above the line. Count the boxes and add them to the trapezium area. That's it. (y)
 
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2mrrw is my physics paper2 and im not quite sure about this vector diagram thing, if u can help? thankyou so much .. also can figure out when to use cos sin stuff...waiting for the reply...
 
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how to find the uncertainity of an area of a circle?

Area of circle has the formula Pie Radius square. the uncertainty would definitely be in Radius value, so use the formula to calculate it and multiply it by 2 because of the square on Radius. Thats it (y)
 
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ASLM guys.. explanation for nov 2012 pp 21 no. 2(b) 3rd part?? cheers!! :)
There is a constant error present in all the readings (zero error, a systematic error). Now, when there is 0 voltage, the current should also be 0, right? But, the graph shows that when the voltage is 0, the current is 0.05 A which tells us that all reading are incorrect by +0.05 A. To account for this error, you'll subtract 0.05 from the reading across any voltage. This is the explanation for getting the correct answer. You need to describe/show this in your answer.

Here's the solution:
Resistance = V/I
when V = 2 V, I = 0.14 A,
correcting error, I = 0.14 - 0.05 = 0.09 A
Resistance = 2/0.09 = 22.2 ohms (correct to 3 s.f.)
 
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There is a constant error present in all the readings (zero error, a systematic error). Now, when there is 0 voltage, the current should also be 0, right? But, the graph shows that when the voltage is 0, the current is 0.05 A which tells us that all reading are incorrect by +0.05 A. To account for this error, you'll subtract 0.05 from the reading across any voltage. This is the explanation for getting the correct answer. You need to describe/show this in your answer.

Here's the solution:
Resistance = V/I
when V = 2 V, I = 0.14 A,
correcting error, I = 0.14 - 0.05 = 0.09 A
Resistance = 2/0.09 = 22.2 ohms (correct to 3 s.f.)

Thanks man :)
 
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Can anybody help with the question 16.7.?image.jpg
It's a question from Robert Hutching's book.
 
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