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Can someone please explain how to solve q18 MJ2013 P11?
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I hope it helpsCan someone please explain how to solve q18 MJ2013 P11?
I am sorry for bothering u again.. But could u explain this question to me??Oh... ty
guys can someone help me out? how do u find the percentage uncertainty in the practical? like i dont know how
Oh thank you but I still don't get how density x area x speed gives the mass of the air hitting the blades.I hope it helps
thank you soooo sooo much again! can u also do question 35 from http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_11.pdf (s13 variant 1)
because since k is low for the first spring, the box will prevent it from breaking by over extending. Hence AI am sorry for bothering u again.. But could u explain this question to me??
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf
Speed is distance/timeOh thank you but I still don't get how density x area x speed gives the mass of the air hitting the blades.
Thanksbecause since k is low for the first spring, the box will prevent it from breaking by over extending. Hence A
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf
Please Q20. It's urgent. Don't understand answer.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_11.pdf Q:18 Ans: D
Q19: The Mariana Trench in the Pacific Ocean has a depth of about 10 km.
Assuming that sea water is incompressible and has a density of about 1020 kg m–3, what would
be the approximate pressure at that depth?
A 10^5 Pa B 10^6Pa C 10^7Pa D 10^8Pa
Ans D
HOW?
You sir are a living legend. I will remember you in my prayers. Thank you very much.This image should clear up things:
So for any stretchable material, we can say that there is a point of applied stress until which they will stretch in a linear manner, i.e. with a constant value of the Young's Modulus. So until this point, the stress will be proportional to the strain applied, which is why this point, the last point of proportionality, is called the limit of proportionality.
However, we have to take a close look at the definition of elasticity - a sample stretches elastically as long as it can return to it's original length by the same route it was stretched by. So the point to remember here is that elasticity does not mean proportionality.
Even after the limit of proportionality has been reached, the sample can still return to it's original length by the same route (initially non-linear, then linear).
But beyond a certain point, even that stops happening - in the diagram, we can see that at C', the sample returns by a different route than it took to reach there. It does not trace it's way back there, and thus has gone by the elastic limit. Therefore, the elastic limit is not the same as the limit of proportionality, and so we can say that the answer is B (A suggests that the limit of elasticity lies in the linear reason, which is wrong. C is wrong since S is not the limit of elasticity, it is the limit of proportionality, and D is wrong since the return of the sample from T is not by the same route).
Hope this helped!
Good Luck for all your exams!
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Can someone please help me in JUN 2012 P11 Qs.( 5 , 8 , 15 , 37)
JUN 13 P12 Qs.( 6 , 20 , 32)
NOV 13 P13 Qs. ( 31 , 32 , 36 , 37 , 38 )
I know its a lot of questions but ive been so confused
Your help would be much appreciated.
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