Pysics Paper 31 (Discussion only)

[Rangers]

I KNOW THAT PAPER WAS freakingly hard

any way lets discuss

 

[unplugged]

How did you do the gradient question in the first page ;>

 

[Rangers]

How did you do the gradient question in the first page ;>

I ignored the work Gradient in the question
i just took the Acc and Force from graphc and used F=MA

 

[unplugged]

How did you do the gradient question in the first page ;>

I ignored the work Gradient in the question
i just took the Acc and Force from graphc and used F=MA

I tried that but when you try it with the different values , you get different masses. oh well.

 

[Natashakhan]

i found the gradientt...bt hw did u guys fynd out mass..??

 

[Rangers]

How many reflection line where there For the optical fibre? i got one reflection and after that the line went out.

y is fibre having many layers? i wrote so the ray dosnt pass through the Material



What u guys say correct or wrong?

 

[unplugged]

Well , i think the idea is. That if you measured the gradient between individual points they would all be different. The gradient is essentially the mass. It was a graph of the Y axis being F and the x being acceleration. So the gradient was F/A. The best fit line we drew provided us with an average mass. so i think the gradient was indeed the mass. But the part that I'm not sure about was that the object didn't move until a certain amount of force was applied. Which means friction was in play , which means that if we use the force to sort out the mass, we're going to overestimate the mass. Oh well , i didn't really have time to think about it.

 

[WayneRooney10]

How did you do the gradient question in the first page ;>

My line began at 1.2N. I took a point. 14. 14-1.2 = 12.8 and the acceleration at 14 was 2.25m/s^2. So 12.8/2.25 = 5.688888888889
Rounding up = 5.7
thats how I did it. Dunno if its right or wrong.

 

[unplugged]

How many reflection line where there For the optical fibre? i got one reflection and after that the line went out.

y is fibre having many layers? i wrote so the ray dosnt pass through the Material



What u guys say correct or wrong?

The ray would never go out of the fiber , if it did , then the data would not be delivered.

Should have been something like this

 

[unplugged]

How did you do the gradient question in the first page ;>

My line began at 1.2N. I took a point. 14. 14-1.2 = 12.8 and the acceleration at 14 was 2.25m/s^2. So 12.8/2.25 = 5.688888888889
Rounding up = 5.7
thats how I did it. Dunno if its right or wrong.

If you mean 5.7 is the gradient , then yes. But i was wondering about the mass. I got the mass to be the same as the gradient >_>.

Or if you meant this how you got the mass , then cool anyways. Since i got the same value.

 

[Ahmooosh]

so we were supposed to end up with 2 sets of lines???

 

[Rangers]

How many reflection line where there For the optical fibre? i got one reflection and after that the line went out.

y is fibre having many layers? i wrote so the ray dosnt pass through the Material



What u guys say correct or wrong?

The ray would never go out of the fiber , if it did , then the data would not be delivered.

Should have been something like this

Oh shit

 

[Rangers]

What is the volume of bubble?

 

[WayneRooney10]

That question, i can't remember what I did. Anyway, what did you get for that tsunami question, the last part. Warning time. I got 2256seconds. or something like that.

 

[unplugged]

so we were supposed to end up with 2 sets of lines???

No , just one ray. It was just the first image of a fibre wire i found.

 

[WayneRooney10]

What is the volume of bubble?

I used P1 x V1 = P2 x V2 to find it

 

[unplugged]

That question, i can't remember what I did. Anyway, what did you get for that tsunami question, the last part. Warning time. I got 2256seconds. or something like that.

Correct

 

[Rangers]

What is the volume of bubble?

I used P1 x V1 = P2 x V2 to find it

HMMMM good

 

[unplugged]

One of the funnier questions. About why the decay rate of the radioactive sample was considered constant. what did you answer.

 

[WayneRooney10]

What about the power question . The pulley thing. What did you put in the table?