AS Physics (9702) Paper 22 Answers and Discussion

[Chucky]

For the moment: perpendicular distance = 0 m...so moment = 0 Nm

You are as stupid as they come.

For the momentum graphs, must we show all calculations?

Yes, hence they gave 5 marks for it.

Grade thresholds will be AROUND 35 to 40(max) Your-Blood because I see a LOT of stupid people commenting here. Those of you that know you got more than 40, can stop worrying.

 

[haha101]

hahah i made such a silly mistake . in the first Q to find the wind speed instead of taking cube root i took square root Man I couldnt believe what i did

 

[mohsinSK]

The charge you calculated in the previous part was the total charge in the given amount of time (Something in Megaseconds)
The next question asked you to calculate the number of electrons per second, so you had to divide the charge obtained in the previous part by the elementary charge of an electron (1.6*10^-19 C)
After that you were supposed to divide the calculated value by the time.

The charge you calculated in the previous part was the total charge in the given amount of time (Something in Megaseconds)
The next question asked you to calculate the number of electrons per second, so you had to divide the charge obtained in the previous part by the elementary charge of an electron (1.6*10^-19 C)
After that you were supposed to divide the calculated value by the time.

http://www.qfak.com/education_reference/science_mathematics/?id=b649471#.UY60uCODrrc

The answer to current is 13.3A. Do me a favor and divide this value by 1.6x10^-19 and tell me what answer you get It's the same as the answer given in the first post. My method was correct. I don't see why you guys have to involve time here. It is simple the charge passing through a circuit in ONE second is EQUAL to the value of current as Q=It where t=1. How do you get the number of electrons? You divide the charge by elementary charge and that's how I did it. Gives the same value

 

[Your-Blood]

You are as stupid as they come.


Yes, hence they gave 5 marks for it.

Grade thresholds will be AROUND 35 to 40(max) Your-Blood because I see a LOT of stupid people commenting here. Those of you that know you got more than 40, can stop worrying.

Dude don't hurt anyone by using such harsh language.
And I don't think showing calculations were important. Your graphs itself were giving your calculations.
Well who knows

 

[Malik777]

the line goes flat for the resultant displacement of the two waves...but there they dint ask us to draw the resultant displacement..they asked us to draw the position of the wave after 0.5t...so wouldnt it be just opposite to the wave already given by them?

Samwe question I did the same :/

 

[Umar Zain]

I thought we are suppose to discuss instead of criticizing here. What you mean is that they won't accept that answer because it does not answer the question based on equilibrium of forces. So if I answer "The rod exert a horizontal force on A, there would be an equal but opposite force (normal force) by the wall acting on the rod. Therefore, no net force." Is that satisfactory? And the momentum, are you sure it's 16.4 not 16.8?[/quote]

 

[Chucky]

It's 16.8, I made a typo there.

 

[Umar Zain]

Despite getting another variant, you answered this one well. Did you receive the question paper or something? If you did, can I have it?

 

[Umar Zain]

Momentum time graph is correct , i think so , because i did the same

the graph was to start from 0 for Accelaration time graph ??
because they said , OBJECT IS INITIALLY AT REST ...
i made the graph start from 0rigin , and look it directly upward , closer to Y Axis , at the point 3.5 ..and then made the graph similar to the graph of Force

That's very detailed of you! Couldn't have come up with that. But acceleration 0 implies force 0, that would contradict the force/time graph despite the statement of initially at rest. CIE is also testing your sensitivity, besides cleverness. The sample of answers given above have so many loose ends in that terms. So don't worry. Be confident if you know you're right. And I don't think they would penalize you for extra workings.

 

[Norton]

Can somebody please discuss this question paper......i really need this !!!!!

 

[pacific116]

in Q2.i think a have drawn the graph having +ve gradient upto 2 s
is it correct
can anybody tell me

 

[goodluckayesha]

does any1 have an idea abt the gt?? wht wud it be possibly??

 

[Hassan Ali Abid]

does any1 have an idea abt the gt?? wht wud it be possibly??

not more then 35 bcz most of the students we screwd cz of graphs and the wave part so it must be around 32-35

 

[goodluckayesha]

not more then 35 bcz most of the students we screwd cz of graphs and the wave part so it must be around 32-35

actually I gave 21 uffh n it was diff it had no graphs I hope uska threshold bi itna hi low jaye...........

 

[Hassan Ali Abid]

yes may be its gt will be also around 35.....the phy gt is always low as comparing chem and bio ...so dw ....if gt of ppr 22 is 35 then gt of 21 will be 35+_ 2 ....* but it also depends on what type of ppr 21 was

 

[goodluckayesha]

yes may be its gt will be also around 35.....the phy gt is always low as comparing chem and bio ...so dw ....if gt of ppr 22 is 35 then gt of 21 will be 35+_ 2 ....* but it also depends on what type of ppr 21 was

it was much easier thn 22 but there were 22 part questions which ppl found to b difficult

 

[Hassan Ali Abid]

it was much easier thn 22 but there were 22 part questions which ppl found to b difficult

if it was easier even then its gt cant exceed more then 40...thats sure ...cz i have seen the gts of last 12 pprs from 10-12 and some were so easy and even then there gts are lying around 30's

 

[goodluckayesha]

if it was easier then even then its gt cant exceed more then 40...thats sure ...cz i have seen the gts of last 12 pprs from 10-12 and some were so easy and even then there gts are lying around 30's

just hoping tht thresholds are low enuff for good grades for evry1 InshAllah.........

 

[Hassan Ali Abid]

just hoping tht thresholds are low enuff for good grades for evry1 InshAllah.........

inshAllah but if one gets low A grade in As then its too difficult to make it A* in A2

 

[goodluckayesha]

inshAllah but if one gets low A grade in As then its too difficult to make it A* in A2

meaning I didn't get u??