Qualification > Sciences

URGENT!!!! PHYSICS MCQ QUESTIONS

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superduper2009:
Can sum1 please help me with the following questions -->
oct/nov 2009 --> q 13,14,15,29
Thanks in advance
superduper2009

astarmathsandphysics:
is that 9701/11 or 9702/12

superduper2009:
it's 9702/11

ilmarien:
For number 15...
Find first the velocity of both trolley by the conservation of momentum.
m1 x v1 = m2 x v2
2 x 2 = 1 x v2
v2 = 4 m/s

Then, find the kinetic energy of both trolley after moving (because the kinetic energy is generated by the potential energy of the spring).
Spring energy = KE1 + KE2 = (0.5x1x4x4) + (0.5x2x2x2)
So... 8+4 = 12 and the answer is D

And for number 29...
Remember the formula F = Eq?
F is force, E is electric field and Q is the charge.
The charge of an electron is 1.6x10^-19 (I think you can find this in the data booklet on the front pages of the question paper)
So, you just need to times the electric field with the charge...
F = 3x10^7 x 1.6x10^-19
The answer is 4.8x10^-12, which is A.

Sorry I can't help you on the other two.
Good luck for the exam!

superduper2009:
thanks anywayz...
astarmathsandphysics cn u help me out in the other 2 plz

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