Physics: Post your doubts here!

[hmlahori]

Fellows need explanations to these questions...they're really confusing
Thanks..

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s11_qp_11.pdf Q34

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w09_qp_11.pdf Q9,14

 

[ABDSyed]

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w10_qp_51.pdf
PLz someone know how to do this Uncertaintiy Q2b
Does Any Know ?
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?
?
?
????????????????????????????????????????????????PLz

 

[Scafalon40]

lolz lets not try and move on & utilize our brilliant brains on some other mcq's. plus i think dakrnessinme is right dat ms and examiner reports can be wrong sometimes. our formula is correct.

So basically you are questioning the the examining body whose papers you have given in your O'levels, and whose papers you are about to give in your A'levels; the very examining body which gives you your grades after years of hard work; the examining body which has world wide recognition, and the body which is affiliated with one of the most prestigious, distinguished, respected and notable Universities of the World.​

It makes mistakes, eh?
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It just may!

 

[confused123]

Fellows need explanations to these questions...they're really confusing
Thanks..

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s11_qp_11.pdf Q34

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w09_qp_11.pdf Q9,14

14 I don't know

 

[confused123]

So basically you are questioning the the examining body whose papers you have given in your O'levels, and whose papers you are about to give in your A'levels; the very examining body which gives you your grades after years of hard work; the examining body which has world wide recognition, and the body which is affiliated with one of the most prestigious, distinguished, respected and notable Universities of the World.​

It makes mistakes, eh?
.
.
.
.
.
.
It just may!

hahaha Bombastic! Loved it i hope u don't get a warning by mods caz of having fun here

yes man the matter of fact is dat this dignified, honourable, disgusting, money making machines, world wide status uni, disrespected, renowned and so on examining body can make MISTAKES!!

 

[hmlahori]

14 I don't knowView attachment 6417View attachment 6418

This makes things so much clearer.
But u no for the resistance of the cube question i was taking the area to be 6(v^1/3)^2 because thats how you calculate the surface area of a cube right.
or else my method was fine. well thanks anyways....

 

[confused123]

This makes things so much clearer.
But u no for the resistance of the cube question i was taking the area to be 6(v^1/3)^2 because thats how you calculate the surface area of a cube right.
or else my method was fine. well thanks anyways....

yeah it was hard to figure out at the first glance. near to impossible to do it right if u get this for the 1st time in exams...ur welcome. stay blessed

 

[confused123]

This makes things so much clearer.
But u no for the resistance of the cube question i was taking the area to be 6(v^1/3)^2 because thats how you calculate the surface area of a cube right.
or else my method was fine. well thanks anyways....

14 )

 

[rideronthestorm]

why do we make tangents from the origin again ?? ... can we make it from any other points when finding gradient like in practical papers :/ ?

 

[confused123]

why do we make tangents from the origin again ?? ... can we make it from any other points when finding gradient like in practical papers :/ ?

yeah i also wonder why? :/ u try i give up.

 

[rideronthestorm]

plz explain all of these tooo

 

[rideronthestorm]

 

[rideronthestorm]

 

[rideronthestorm]

 

[rideronthestorm]

 

[rideronthestorm]

 

[confused123]

plz explain all of these tooo View attachment 6426

right options in the marking scheme of all mcqz abv plz?

 

[rideronthestorm]

a,a,a,b,d,c in the order i uploaded

 

[hmlahori]

14 )View attachment 6425

wow you solved it.... that was really hard and it has a long solution..
physics paper 1 is genuinely hard!
well thanks.....

 

[Mustehssun Iqbal]

plz explain all of these tooo View attachment 6426

Love to answer this Physics question : )
You start with re-drawing or editting the diagram in the picture, and you mark the;
"perpendicular" distances from the lines of forces to the pivot and;
the motion of the rod in terms of whether it is deduced to be clockwise or anticlockwise.
And you get a diagram something like this(uploaded in the picture)
The dottel lines represent the "perpendicular" distance from the lines of forces to the pivot and the noticeably curved arrows represent the anticlockwise and clockwise moments in the picture.
You resolve the moments of forces in the question;
Torque = 5(2) + 10(2) -20(3)
therefore Torque = 10 + 20 -60
therefore Torque = -30 Nm Ans A
You take either anticlockwise moment or clockwise moment as the positive direction in the calculation of this question. In this case, anticlockwise moment of force is taken as the positive direction in the question. Answer is 30 Nm. Ans A