physics paper 1 2011 discussion

[Ahmooosh]

it was 19 mm , the trick was to make people think its 29 mm , since the leaf starts at 10mm and ends at 29mm

 

[Gunner1995]

Ali: I would say an A... Not an A* but an A... I CANT BELIEVE I MADE A MISTAKE ABOUT THE AC GENERATOR TODAY! 3-4 mistakes so far... Is that good enough for an A*

 

[DowntownCrew]

what grade will I get while losing 20 marks in ppr4 and 10 in ppr2?? any guess?

Take the percentage .. reduce 10 marks from the total marks in ppr2 and divide by the total marks number and multiply with the percentage that paper weighs .. same in ppr4.

For example , if paper is 40 marks and it weighs 30 % and lets say u get 35 marks from it , then it will look like this : 35/40 x 30 % ... it comes like 26.25 xD

 

[dooolazz]

wat about the machine question will da workdone increase or stay unchanged and da useful output will it increase or decreasa ? :S

 

[burndtjamb]

what grade will I get while losing 20 marks in ppr4 and 10 in ppr2?? any guess?

Definitely A, maybe A*

 

[IGCSEdude]

Are you guys sure about the lamp question? I DID it on off off ! I don't really remember but i think the switch was behind that external circuit. Also about the barometer, answer is pressure at X and Y is equal.. I did it wrong tho ! Math wasn't easy tho but I did good in it. Mensuration question was .... :shock:
Anyways good luck for paper 6 bio :good: .. MY MOST HATED PAPER

 

[WayneRooney10]

The thing with the barometer question is that liquid pressure is affected by 3 things only: density of the liquid, gravitational acceleration, and the depth of the liquid.

Both X and Y were at the same depth, and since the density of mercury and gravitational acceleration is constant the pressure at points X and Y should be equal.

Y was deeper

 

[Ahmooosh]

guys about that machine thing wat was it ?

 

[DowntownCrew]

wat about the machine question will da workdone increase or stay unchanged and da useful output will it increase or decreasa ? :S

 

[ali123456789]

what grade will I get while having 100 marks in ppr4 out of 130 and 50 marks in ppr2 of maths out of 70

 

[WayneRooney10]

wat about the machine question will da workdone increase or stay unchanged and da useful output will it increase or decreasa ? :S

Increase

 

[DowntownCrew]

wat about the machine question will da workdone increase or stay unchanged and da useful output will it increase or decreasa ? :S

Increase

Both increase ??

 

[Ahmooosh]

u sure ? :S i dunno isnt it like efficiency , output is lower than input?
i wrote unchanged , decreased

 

[WayneRooney10]

Both increase ??[/quote]

Work will remain unchanged, But the power output will increase

 

[DowntownCrew]

u sure ? :S i dunno isnt it like efficiency , output is lower than input?
i wrote unchanged , decreased

I wrote increased - decreased ... they used a motor before sunset and their work increased ???

 

[Ramosk95]

i thought that they are lifting with same force because the masses are identical so same work but less time so more power but am not sure can anyone tell me y??

 

[WayneRooney10]

i thought that they are lifting with same force because the masses are identical so same work but less time so more power but am not sure can anyone tell me y??

Same WORK. More POWER. You are correct.

 

[WayneRooney10]

u sure ? :S i dunno isnt it like efficiency , output is lower than input?
i wrote unchanged , decreased

I wrote increased - decreased ... they used a motor before sunset and their work increased ???

Work = Force x distance. force and distance were same both evening and morning. So it remains UNCHANGED. BUT less time was being taken. Which means power was more.

 

[Ramosk95]

i thought that they are lifting with same force because the masses are identical so same work but less time so more power but am not sure can anyone tell me y??

Same WORK. More POWER. You are correct.

but i think that we're wrong becausethere is an equation which is w=fv whre w=work and f=force and v=velocity so higher velocity with same force so more work :ss but it is for AS level
for maths what did you write for the rod does it fit or not??

 

[WayneRooney10]

that equation, i have never heard of. AND probably isnt in our syllabus.