Physics Paper 12 How was it

[umarashraf]

okayy so guys what was the final answer of the ladder one D or B?

It has to be B... i can bet thousand times...

 

[Mattman]

Yea i looked at my friend's papers and they got around 10+-4 wrong... so threshold cant be that high.

 

[umarashraf]

okayy so guys what was the final answer of the ladder one D or B?

well ice was frictionless, so R was always vertical in direction... but the wall was rough... when the ___ was sliding down, the frictional force would be in upward direction while the reaction force was in horizontal plane... so their resultant was in direction at an angle 45 to the horizontal.. which was B.. cut my head if gets wrong​

 

[Knight]

what about the displacement time graph from velocity time graph........was it A or D

 

[Mattman]

A

 

[Silent Hunter]

A ........ btw what was A ? i think a single curve above the x-axis?

 

[Mattman]

yupthe curve was something like this _/''''\_ the straight lines indicating 0 velocity

 

[Silent Hunter]

exactly

 

[umarashraf]

what about the displacement time graph from velocity time graph........was it A or D

A

 

[avenger]

Now i admit im wrong..caz u gave the right explanation

finally

 

[avenger]

okayy so guys what was the final answer of the ladder one D or B?

i did D but that was just a wild guess. one of the guys explanation above looks correct

 

[leosco1995]

I'm not sure if I wrote B or D for the ladder one. I think I wrote B. And the displacement-time graph was A, because the velocity-time graph was a +ve sine wave. Since velocity = rate of change of displacement, it means the displacement-time graph had to be a -ve cos wave which was only in A.

I can't believe people are still discussing the paper. Enjoy your holidays.

 

[iamzaidhabib]

pm me the list too if u can

ok bro but i still didnt get the list :/

 

[Saad Sarfraz]

well ice was frictionless, so R was always vertical in direction... but the wall was rough... when the ___ was sliding down, the frictional force would be in upward direction while the reaction force was in horizontal plane... so their resultant was in direction at an angle 45 to the horizontal.. which was B.. cut my head if gets wrong​

It isn't B infact it was A..look at all the past papers from 2002...in one paper they asked about finding torque on ladder which was placed on frictionless surface..and they also gave a diagram in which both the forces were straight lines..

 

[Silent Hunter]

It isn't B infact it was A..look at all the past papers from 2002...in one paper they asked about finding torque on ladder which was placed on frictionless surface..and they also gave a diagram in which both the forces were straight lines..

For that ladder one?

 

[umarashraf]

It isn't B infact it was A..look at all the past papers from 2002...in one paper they asked about finding torque on ladder which was placed on frictionless surface..and they also gave a diagram in which both the forces were straight lines..

wait for the ms to come mate... i wish to live till that day... i have not solved any pastpaper question like that before i believe in my physics...