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ALL CIE PHYSICS DOUBTS HERE !!!

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astarmathsandphysics:
Q10
Use Newtons Law of restitution
e=(separation speed)/(approach speed)=(v2-v1)/(u1+u2)
e=1 for a perfectly elastic collision so v2-v1=u1+u2
answer is D
q11
Applying F=ma for 2 kg mass 2g-T=2a
applying F=ma for 8kg mass T-6=8a
add these to get 2g-6=10a so a=(2g-6)/10=1.36

Physics09:
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w10_qp_12.pdf
Explanation to the answer of MCQ 27, urgently please!!

astarmathsandphysics:
see attachment

Physics09:
Thanku so much!
Also, MCQ 34 and 27
http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s10_qp_12.pdf
Thanks again!

SkyPilotage:
Q27 - Electric Field direction is always from +ve to -ve plate. SO if the electric field direction is away from you means the +ve plate is closer to you than the -ve plate, therefore the electron beam goes towards the +ve plate which is towards you so the answer is D!

Q34 - Total Resistance is 1.5R ---> so I^2 = P / 1.5R = 8 A^2 ---> I = 2.83 A
Here I took the value of R as 1 ohm, you can take it as any value you want as long as you are cosistent with all the resistors P,Q and R.
So P across P = (2.83)^2 x 1 = 8 Watts
P across Q = (2.83 / 2 ) ^2 x 1 = 2 Watts
P across R = P across R2 = 2 Watts.
Answer is A

There you have it!

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