Physics: Post your doubts here!

[Minsa Fatima]

GUYS, ANYONE REMEMBER THE SHM QUESTION. VARIENT 42. DID IT SAY STATE AND EXPLAIN HOW THE TROLLEY IS DAMPED ??? OR DID IT SAY '' STATE '' ONLY.. I WROTE ' LIGHTLY DAMPED ' ONLY.

we had to explain it as well.

 

[Zaki ali asghar]

The gradient was in the same direction but one line was passing through positive values of B and other through -ve.
So wont they be in opposite directions? Does sign of B make any difference?

http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-5.html read the explanation for Q34ii. it says"that since the gradient is in opposite directions emf would be in opposite direction to but in paper the gradient was in same direction

 

[anastasia grey113]

The gradient was in the same direction but one line was passing through positive values of B and other through -ve.
So wont they be in opposite directions? Does sign of B make any difference?

ik thaz wut made me draw the peaks in opposite directions
m still not sure y they were post to be in the same directions but many of my friends said that it was the gradient which had to be considered

 

[haithsoul]

ik thaz wut made me draw the peaks in opposite directions
m still not sure y they were post to be in the same directions but many of my friends said that it was the gradient which had to be considered

because both gradiants are negative. So in the same direction the second line was steeper so the peek is larger.

 

[Minsa Fatima]

http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-5.html read the explanation for Q34ii. it says"that since the gradient is in opposite directions emf would be in opposite direction to but in paper the gradient was in same direction

Idk but over there values of B are GREATER THAN Zero only. There arent any -ve values as were in our paper

 

[anastasia grey113]

ok m a lil worried now
wut was the definition of bandwidth? i wrote 'the maximum signal frequency carried by a carrier wave x 2' is that right?
and like i dint mention the 'no increase in kinetic energy 'during melting...i just wrote abt increase in potential energy of particles
do u think there will be a mark for Ek as well?

 

[anastasia grey113]

n do u think the threshold is ACTUALLY going to be higher than in 2017? did u guys find this paper easier than last year's?

 

[Minsa Fatima]

ik thaz wut made me draw the peaks in opposite directions
m still not sure y they were post to be in the same directions but many of my friends said that it was the gradient which had to be considered

If we consider sign of B and put it in formula that we used before to prove the voltage wont we get a negative value of voltage?
Are u sure your friends did it the right way?

 

[anastasia grey113]

If we consider sign of B and put it in formula that we used before to prove the voltage wont we get a negative value of voltage?
Are u sure your friends did it the right way?

no m not sure but idk they might be right
cuz the B was decreasing
it's not the value of B that matters but the change in B that does i think

 

[Minsa Fatima]

ok m a lil worried now
wut was the definition of bandwidth? i wrote 'the maximum signal frequency carried by a carrier wave x 2' is that right?
and like i dint mention the 'no increase in kinetic energy 'during melting...i just wrote abt increase in potential energy of particles
do u think there will be a mark for Ek as well?

IN the application booklet it is the range of frequencies occupied by a waveform. It would be the difference in max and min frequencies.
As for the other you might lose a mark for not explaining why there was no temp change

 

[anastasia grey113]

IN the application booklet it is the range of frequencies occupied by a waveform. It would be the difference in max and min frequencies.
As for the other you might lose a mark for not explaining why there was no temp change

DAMN :/ M LOSING 6 MARKS ALREADY

 

[Minsa Fatima]

no m not sure but idk they might be right
cuz the B was decreasing
it's not the value of B that matters but the change in B that does i think

The change could be say, 0-12= -12 or 0-(-12)=12 so change could be either -ve and +ve. no?

 

[anastasia grey113]

The change could be say, 0-12= -12 or 0-(-12)=12 so change could be either -ve and +ve. no?

lol idk man
u might be right
m not sure now but i drew the same graph n everybodys been telling me its wrong
dude just asking...did u find this year's paper tougher than last year's?

 

[Zaki ali asghar]

you just had to consider the gradient, like in that question. since the gradient is negative for both, emf is in same direction for both.

 

[Zaki ali asghar]

FOR BANDWITH I JUST WROTE THE RANGE OF FREQUENCIES. SHIT

 

[Zaki ali asghar]

i really hope the threshold stays between 55-60 or max of 62.

 

[anastasia grey113]

i really hope the threshold stays between 55-60 or max of 62.

dude compare it to last yea
was it harder? the '17 one?

 

[Zaki ali asghar]

i did 17 one a day before and got around 84, i think it was tougher than this year. NOOOOO last year was 55

 

[Minsa Fatima]

lol idk man
u might be right
m not sure now but i drew the same graph n everybodys been telling me its wrong
dude just asking...did u find this year's paper tougher than last year's?

I think there wasnt much differemce although I made a few silly mistakes. What about you?

 

[anastasia grey113]

I think there wasnt much differemce although I made a few silly mistakes. What about you?

i found this one tougher :/

i did 17 one a day before and got around 84, i think it was tougher than this year. NOOOOO last year was 55

dude idk i found this one tougher and like idk it should go below 55 now >.<
idk if ill get an A* if it touches 60