How was 9702 W15 paper 22?

[awesomaholic101]

Only four?? I lost more

shit no ... not again! .... that tough?

 

[The Sarcastic Retard]

Hell no. 40 max, 35 most probably.

Nah, it was not that tough man.

Guys, what was your value of your resistance R in the first question?

650

 

[DarkEclipse]

Mine I1 was 0.16
Mine I2 was 0.24
0.24^2 * 350 = 20.16
0.16^2 * 550 = 14.08
so P in 350 / P in 550 = 20.16/14.08 = 1.43 : 1

I used V^2/R. Ah well. My I values were the same.

 

[Harsheys]

The electricity question was why the power is not 48W, which is when you say some voltage is lost overcoming the internal resistance of the cell so the lamp doesn't get all 12V, so power is not 48W
Could someone explain what happens to current and resistance when the other switch is closed?

Resultant magnitude of velocity was 12.2, the graph question, i think amplitude was 3.2(?) and wavelength was 20mm
At A, there is maximum displacement because path difference is lambda,
And at B, there is no displacement because path difference is 0.5 lambda, so waves interfere destructively, causing no displacement of the water.

 

[DarkEclipse]

I wrote 11:7 for the ratio. Will i get marks for that, or did I have to write one number only?

Nah, it was not that tough man.

Dude, even the easiest papers don't go above 40. Check the GTs

 

[The Sarcastic Retard]

I used V^2/R. Ah well. My I values were the same.

If u used V^2/R u should get the same answer.
v across 350 ohm resistor = 0.24 * 350 So power in 350 = 84^2 / 350 = 20.16
v across 550 ohm = 0.16 * 550 so power in it = 88^2/550 = 14.08
Therefore : 20.16 / 14.08 = 1.43 : 1

 

[The Sarcastic Retard]

I wrote 11:7 for the ratio. Will i get marks for that, or did I have to write one number only?


Dude, even the easiest papers don't go above 40. Check the GTs

But I guess this paper will go about 43 seriously. I didnt found it that hard...

 

[DarkEclipse]

But I guess this paper will go about 43 seriously. I didnt found it that hard...

It won't, trust me.

 

[ahmedish]

Nope. 63/44 in that white space. And 1.43 in dotted space.

Thats alright bro, thats how its done even.

What was resultant magnitude of velocity in Q1 ?

I did a triangle thing and measured it and all got 11,4ms-1, however my friends got 12

How about graph?

Straight line till 2.8s, forgot the velocity but its in negative

Waves??? D1A and D1B thingy what was that?

get path difference and see if its equal to n wavelength or n+0.5

Hell no. 40 max, 35 most probably.

I hope

Guys, what was your value of your resistance R in the first question?

650

 

[ahmedish]

The electricity question was why the power is not 48W, which is when you say some voltage is lost overcoming the internal resistance of the cell so the lamp doesn't get all 12V, so power is not 48W
Could someone explain what happens to current and resistance when the other switch is closed?

Resultant magnitude of velocity was 12.2, the graph question, i think amplitude was 3.2(?) and wavelength was 20mm
At A, there is maximum displacement because path difference is lambda,
And at B, there is no displacement because path difference is 0.5 lambda, so waves interfere destructively, causing no displacement of the water.

Thats what i mean.
and Switch 2 is closed> total resistance increases> TOTAL current increases> as V=E-Ir, the lost volts increase as total current increase, terminal pd of the battery drops. The lamps have parallel connection. each gets full terminal pd. but new terminal pd is less, and same resistance, so Current is less.

 

[DarkEclipse]

Thats what i mean.
and Switch 2 is closed> total resistance increases> TOTAL current increases> as V=E-Ir, the lost volts increase as total current increase, terminal pd of the battery drops. The lamps have parallel connection. each gets full terminal pd. but new terminal pd is less, and same resistance, so Current is less.

I used Kirchoff's law to explain that xD

 

[DarkEclipse]

Anyway, I don't want an A. I just want a B in physics

 

[The Sarcastic Retard]

Thats alright bro, thats how its done even.

I did a triangle thing and measured it and all got 11,4ms-1, however my friends got 12

Straight line till 2.8s, forgot the velocity but its in negative

get path difference and see if its equal to n wavelength or n+0.5

I hope

650

I got 12.12 in Q1

I got graph st.line from (0, 3.6) to (IDK, - 4.8) :/

And that wave thingy I worte constructive interference so n*lambda and for destructive it will be n + 1/2 * lambda.

 

[ahmedish]

******* hell man! problem is, the thought just came to my mind suddenly after the exam. I think I am losing resultant velocity as well. I am getting 50/60 minimum tho.

I used Kirchoff's law to explain that xD

Does anyone know when the rest of the variants are?? If theirs come easy, we get extra marks, so its sorted

 

[ahmedish]

I got 12.12 in Q1

I got graph st.line from (0, 3.6) to (IDK, - 4.8) :/

yep, but should stop at 2.8 seconds exactly

 

[The Sarcastic Retard]

yep, but should stop at 2.8 seconds exactly

Yeah it was 2.7 :/ I stoped there

And about waves is it correct I edited ma post check it.

 

[ahmedish]

I may sound like a cunt cos i am whining but I really wanted to lose 10 max in AS. my new goal is now 15, because I will take too many subjects next year so i want to be able to **** up and still get A*'s.

 

[The Sarcastic Retard]

******* hell man! problem is, the thought just came to my mind suddenly after the exam. I think I am losing resultant velocity as well. I am getting 50/60 minimum tho.

Does anyone know when the rest of the variants are?? If theirs come easy, we get extra marks, so its sorted

Why resultant velocity isn't 12.12 ?
Plus what was ur change in momentum?
And were u able to prove T = 2.1kN ?

 

[The Sarcastic Retard]

I may sound like a cunt cos i am whining but I really wanted to lose 10 max in AS. my new goal is now 15, because I will take too many subjects next year so i want to be able to **** up and still get A*'s.

I dont get it.

 

[ahmedish]

Why resultant velocity isn't 12.12 ?
Plus what was ur change in momentum?
And were u able to prove T = 2.1kN ?

It is. You can use cosine rule to get it. I ******* measured the length of the scale and got 11.4 so I am losing a mark here I guess I am not sure. coulda used cosine rule I always used that fml
I did prove T yes
0.489 I reckon