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  1. Z

    The Ultimate AS Physics Thread

    Which question? can you send me the links
  2. Z

    The Ultimate AS Physics Thread

    It doesn't! It only increases if you increase intensity or increase the separation of the slits! Or use a brighter light :)
  3. Z

    The Ultimate AS Physics Thread

    Question 4 part i 1: 1mm. And yeah, you have to memorize this :) Question 5 b part ii: At beginning of question it says the lamp operates normally at 6 volts. Looking at the graph you'll see the current for 6 volts is 40mA. So basically, in the circuit with the resistor, you need to have a...
  4. Z

    The Ultimate AS Physics Thread

    @AlyHamza I remember doing this problem before, I think it goes like this: We know Voltage = Work/Charge (so voltage only depends on work and charge) Then, we know that voltage is the same. So the work done by the electron is voltage x charge. There is no mention of the uniformity of speed, so...
  5. Z

    The Ultimate AS Physics Thread

    Well the diameter of the circle is given (3cm) Circumference of circle = 2(pi)r = pi x diameter = 3pi Since the pointer move 6.5 degrees: distance = 3pi x (6.5/360) distance = .17 cm
  6. Z

    The Ultimate AS Physics Thread

    Its Question 4 in this http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s03_qp_2.pdf main problem was the second part, I didn't get how intensity increases the brightness. Well we know the formula for diffraction grating: dsinx=nλ Basically you have...
  7. Z

    The Ultimate AS Physics Thread

    Well we know that the electric field goes from positive to negative. Therefore, the force on P would be towards the right, and the force on N would be towards the left. Now we must calculate torque. We know that torque = one force x perpendicular distance between forces Force: Charge is given...
  8. Z

    The Ultimate AS Physics Thread

    Could someone atleast answer my question...? How do you find the phase difference between two waves?
  9. Z

    The Ultimate AS Physics Thread

    So as the CIE AS Physics theory papers are coming up in a few days, I thought it would be a good idea to make an organized thread which could be easy to navigate through for last minute revision. Basically, if a normal person was just browsing this thread, he would have a lot to gain just by...
  10. Z

    Mechanics!

    Thanks! I finally understood it! This is more trigonometry than MECHANICS. Haha
  11. Z

    Mechanics!

    Sigh... looks like im failing tmws test.
  12. Z

    Mechanics!

    Thats the one I was talking about! I really hope something like this does not come on the test tomorrow >_>
  13. Z

    Mechanics!

    So no matter where the COF is we always take the total R? Like when its on bottom and middle, R stays the same. Thanks, and by the way did you understand that other pulley problem?
  14. Z

    Mechanics!

    Shouldn't we take the R from only the top box in this equation? Wouldnt it be 2000*0.2? Why are we taking R from both of the boxes?
  15. Z

    Why won't any1 answer my mech 4 question! HELP

    For gods sake I really do not understand this questions AGH SOMEONE EXPLAIN IT CLEARLY
  16. Z

    Mechanics!

    I was wondering if someone could help me with this M1 problem: http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9709%20-%20Mathematics/9709_s10_qp_43.pdf I have read the mark scheme, but I still do not understand parts 2 and 3. All help appreciated!
  17. Z

    Heat of Combustion Problems?

    mmkay. thanks.
  18. Z

    Heat of Combustion Problems?

    Oh thanks! I knew the second equation, just not the first one. A question: in the equation ΔHf = ΔHc (reactants) - ΔHc (products) the Hf is for the product in the equation 2C + 2H2 ---> C2H4 right? Say, what if the equation had been C2H4 --> 2C + 2H2 ? Is this even possible, and if so how...
  19. Z

    Heat of Combustion Problems?

    Hi, I was wondering if someone could help me on this enthalpy problem? The only problem I have with enthalpy is when combustion is involved. It's question 1(e) in this: http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w07_qp_2.pdf All help...
  20. Z

    Grade Thresholds?

    Oh alright, thanks
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