physics paper 1 2011 discussion

[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.

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??

The rod fits

 

[Ramosk95]

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

i'm not sure man hope to be wrong and i heared this equation once but maybe it does not exist

 

[WayneRooney10]

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

i'm not sure man hope to be wrong and i heared this equation once but maybe it does not exist

And the Rod fits. what did you put??

 

[shorty21]

what did you guys write for the one of boiling water?
Dont remeber the question.. but it had to do with electricity

 

[WayneRooney10]

what did you guys write for the one of boiling water?
Dont remeber the question.. but it had to do with electricity

Dont remember any question like that. U probably did another variant

 

[shorty21]

i did paper 11
so yea umm anyone else get that question?

 

[IGCSEdude]

I think the rod didn't fit. Because they said *completely* in the box.. which probably means it must touch the floor? Am not sure tho. That's why i wrote No, because the hypotenuse of the triangle in the lower base is less than the length of the bar which would be 2.95m.

 

[WayneRooney10]

I think the rod didn't fit. Because they said *completely* in the box.. which probably means it must touch the floor? Am not sure tho. That's why i wrote No, because the hypotenuse of the triangle in the lower base is less than the length of the bar which would be 2.95m.

I said it would fit diagonally. Diagonal was 3.02m. more than the rods length

 

[burndtjamb]

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

I object, the mercury level at the sides of the barometer was higher but it doesn't make a difference when you are calculating liquid pressure at Y, which was directly below the column of mercury. The heights of the columns were the same, therefore the pressure at X and Y will be equal.

 

[shorty21]

The heights for not the same! there was a difference!

 

[PUSHPAK1321]

Ok guys amout the barometer, the pressure at X is less than at Y because at X the height of the mercury above it in the beaker is small This means at X=atmospheric pressure + small pressure due to less mercury above it. While at X height in the beaker above Y is grater this means at Y=atmosphere pressure + pressure exerted by the mercury above it with more height. After all the pressure means what is above the point.

 

[adityar]

Ok guys amout the barometer, the pressure at X is less than at Y because at X the height of the mercury above it in the beaker is small This means at X=atmospheric pressure + small pressure due to less mercury above it. While at X height in the beaker above Y is grater this means at Y=atmosphere pressure + pressure exerted by the mercury above it with more height. After all the pressure means what is above the point.

FINALLY someone gets me...

 

[Cozmo35d]

hey guys Im new here , math exam was so easy except for the last question which was to find a and b, & in physics I made little mistakes like in the lamps, barometer, and step-down questions.

My answers were:

1-Barometer Question: Pressure at X & Y are equal.
2-Step-down transformer: I chose the coils at the left
3-Lamps Question: ON,OFF,ON

 

[WayneRooney10]

hey guys Im new here , math exam was so easy except for the last question which was to find a and b, & in physics I made little mistakes like in the lamps, barometer, and step-down questions.

My answers were:

1-Barometer Question: Pressure at X & Y are equal.
2-Step-down transformer: I chose the coils at the left
3-Lamps Question: ON,OFF,ON

1- Wrong.
2- Wrong
3- Wrong

 

[Cozmo35d]

I knew that

 

[WayneRooney10]

I knew that

This is what I put
1- Same atm pressure both days.
2-Left wrong! did the question say it was a step down transformer?
3- On ON On