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S(07) Q18, 23, 27, 37, 40 http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s07_qp_1.pdf
Thanks for your help
Thanks for your help
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before going on, you should check if you have included all information and if question is typed correctly
Solution:
Force, F is equal to rate of change of momentum. (F = Δp / t)
Force is also equal to ma and momentum is given by p = mv (assuming the ball is at rest initially)
So, ma = mv / t giving a = v / t = 70 / 0.0005 = 140 000
but this answer is not realistic. you should check the question again
By the way, you should also try to visit the link in my signature, it should help
Thanks buddy..but i still don't get it..why the current 0.2A also flows through the 20Ω resistor??arvin vinz
the explanation is available at http://physics-ref.blogspot.com/2014/05/physics-9702-notes-worked-solutions-for.html
Answer is indeed 18
That was helpful..thanks againi've added some more explanations there. you may check it again
adarsha there's no way that formula is going to give acceleration. You can just check the units, you won't obtain the units of acceleration + some data are not used.
Can you give me the answer, I'll see if I can obtain the answer correctly
thanks a lot that one was really troubling me and sure will drop a question in the blog if i ever run into a problemI have added the correct explanation at
http://physics-ref.blogspot.com/2014/05/physics-9702-notes-worked-solutions-for.html
check it and if there's still a problem, comment there
You may also ask for any other problems there
what type of help u need in it ??? any specific question ???Can someone please help me out with As level physics uncertainty?
It's 2011 paper 13Year 2013 P11 0r Year 2011 P13???
Well I solved all of them and found that one of your answer is wrong. That is of kinetic energy.
So Here you go :
15)
So Clock wise moment = Anti Clock wise moment
Therefore 300 * 0.4 = 200 * 0.8
--> 40 Anticlockwise direction.
Alternative :
By taking the torque clockwise at the centre:-
=>300 x 0.4 - 200 x 0.4 = 40 Nm (clockwise)
=>Thus to balance it required torque is 40 Nm (anticlockwise)
=>(B)
13)
Already answer. Here in some more detail,
The ratio of the radius of the pulley to the arm is 0.2m/0.6m. Multiplying that by 900N gives you 300N. There are two force vectors, so 150N needs to be applied to each arm.
In other words,
To lift the weight, the cord needs to exert at least 900 N of force.
This means the disc needs to exert at least (900 N * 0.20 m) of torque.
This means the two forces on the lever needs to each exert at least (1/2 * 900 N * 0.20 m) of torque.
This means each force on the lever needs to be at least (1/2 * 900 N * 0.20 m / 0.60 m).
-> 150N
10)
This is the question where ms might not be correct or you haven't looked properly,
X = 1/2 x m x (-v)^2
Y = 1/2 x 2m x v^2 = m x v^2
Ratio of X/Y :
1/2 x m x v^2
--------------- = 1 / 2
m x v^2
Hope you got all of them.
Anytime.Checked xtremepapers after ages, Thanks a tonne!!!
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