physics paper 1,2 ........can we discuus da papper nw?

[Vogue]

and where did we have to point the arrow at the water molecule X in paper 2? That wave question?

i did it upwards

 

[beeloooo]

I didn't attempt question 9. And you have to bury it to dispose it, means option 'B'.
and yes, conventional current is the same like in a normal circuit
And, A was the force towards the centre of the circle, not friction.

i think that keeping the temperature of the wire constant thingy was in q.8 :/ !!

 

[Rimi]

abt the radioactive waste disposal u mean under the Earth in those deep rocks?

Yup. Option B

 

[Rimi]

i did it upwards

I did it downwards. No idea why though. Total tukka xD

 

[Fallen316]

i did it upwards

it was downwards .

 

[Vogue]

it was downwards .

oh ok. but most ppl did it upwards.

 

[beeloooo]

it was downwards .

i did it downwards because it was already up at X :/

 

[Tharindu]

How was it 2/3P? o.o

Use p*v=p*v since it is constant temperature
The pressure at the start is P and 200 cm3
When the valve is open the gas spreads and the volume occupied is 200+100=300cm3....and let the pressure be x which we need to find
200P=300x
X=200/300 P
X=2/3 P

 

[Tharindu]

oh ok. but most ppl did it upwards.

Which one is this???

 

[beeloooo]

HW CAN THE GAS SPREAD ??? pressure was fixed , wasn't it ??? !!

 

[Tharindu]

HW CAN THE GAS SPREAD ??? pressure was fixed , wasn't it ??? !!

The volume changes....when volume increases pressure decreases....pressure is not constant...

 

[Tharindu]

The volume changes....when volume increases pressure decreases....pressure is not constant...

Pressure is inversely proportional to the volume...check your notes it Boyles law

 

[Rimi]

HW CAN THE GAS SPREAD ??? pressure was fixed , wasn't it ??? !!

How can the pressure be fixed? xD There is no pressure in a vacuum, so pressure from the left container was forced into the right container, thus decreasing the overall pressure in the left one !

 

[shezi1995]

Use p*v=p*v since it is constant temperature
The pressure at the start is P and 200 cm3
When the valve is open the gas spreads and the volume occupied is 200+100=300cm3....and let the pressure be x which we need to find
200P=300x
X=200/300 P
X=2/3 P

Exactly what I did!

 

[Tharindu]

How can the pressure be fixed? xD There is no pressure in a vacuum, so pressure from the left container was forced into the right container, thus decreasing the overall pressure in the left one !

Exactly and you can see only 2/3p is decreasing...the other answers were p which is the same....2p means double...3/2p is also more....from tat way itself you see that it's the answer

 

[Rimi]

Exactly and you can see only 2/3p is decreasing...the other answers were p which is the same....2p means double...3/2p is also more....from tat way itself you see that it's the answer

P/2 is also decreasing

 

[beeloooo]

How can the pressure be fixed? xD There is no pressure in a vacuum, so pressure from the left container was forced into the right container, thus decreasing the overall pressure in the left one !

OOPS SORRY MY BAD

 

[Tharindu]

P/2 is also decreasing

Ok...lol..I forgot that answer...its common sense that it's not half....that's not the point lets discuss the paper

 

[beeloooo]

Exactly and you can see only 2/3p is decreasing...the other answers were p which is the same....2p means double...3/2p is also more....from tat way itself you see that it's the answer

it wasn't p .. it was p/2 !! exactly which also decreases

 

[beeloooo]

Ok...lol..I forgot that answer...its common sense that it's not half....that's not the point lets discuss the paper

it was A anyway according to my teacher whom i told the complete mcq when it was fresh in my memory