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    Physics Exam Thoughts

    Personally found MCQ and some short answers hard
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    Re: Physics Exam Thoughts

    Wasn't too bad. I only got stuck with 2 MCQs and a few short answers. I didn't go too well in my option topic though. Kinda wish I focused on it more during study.

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    Re: Physics Exam Thoughts

    Some of the MC and Short Answers were weird. The Astrophysics questions were all on the boring parts of the topic (imo) which sucked. I liked the exam though, thought it was pretty interesting.

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    Re: Physics Exam Thoughts

    Last few MCQs were a bit hard, what was wrong with the short answers though?
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    Re: Physics Exam Thoughts

    Rip got 16/20 in MCQ and the radiation question was really hard probably stuffed that up
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    Re: Physics Exam Thoughts

    That magnetic flux question got me...
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    Re: Physics Exam Thoughts

    projectile was fked

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    Re: Physics Exam Thoughts

    Same.
    Radiation question for space re-entry.
    The Magnetic flux one.
    And finding the range for that projectile tbh. (If you guys got that out, how'd you do it? I think the initial velocity was 10m/s and angle 60 degrees?)
    But I tried to write at least something down for each.

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    Re: Physics Exam Thoughts

    The radiation question was bs had no clue what I was writing
    Proton I half bsed it but hopefully my north west helical shape was right

    To the person above, range was found using delta y = 0, finding t and subbing back into delta x.
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    Re: Physics Exam Thoughts

    Quote Originally Posted by Commando007 View Post
    projectile was fked
    The first part was a bit trickier you needed to realise that you needed to use the value you got for potential energy of the spring was converted to the kinetic energy of the ball so you could use 1/2mv^2 to find velocity. The second part was quite standard though.
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    Re: Physics Exam Thoughts

    Quote Originally Posted by silverdawn565 View Post
    Same.
    Radiation question for space re-entry.
    The Magnetic flux one.
    And finding the range for that projectile tbh. (If you guys got that out, how'd you do it? I think the initial velocity was 10m/s and angle 60 degrees?)
    But I tried to write at least something down for each.
    I'm paranoid after seeing so many people struggle with projectile that I might've missed something too. But I just used y = ut + 1/2at^2 to find t first, then used t to find range since you know initial horizontal and vertical velocity.
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    Re: Physics Exam Thoughts

    Yeah the radiation question for re-entry confused me as well. I also really liked the projectile question, it was cool to get something different and not just something really standard.

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    Re: Physics Exam Thoughts

    Did anyone figure out how to do question 19 (The one with the rope and the galvanometer) ?

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    Re: Physics Exam Thoughts

    Quote Originally Posted by RB1234 View Post
    Did anyone figure out how to do question 19 (The one with the rope and the galvanometer) ?
    Apparently you use right hand palm rule so it's C ahha rip I thought it's D because it's closer to surface so more change in flux
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    Re: Physics Exam Thoughts

    Quote Originally Posted by pikachu975 View Post
    The radiation question was bs had no clue what I was writing
    Proton I half bsed it but hopefully my north west helical shape was right

    To the person above, range was found using delta y = 0, finding t and subbing back into delta x.
    Oh. *fp* Now I feel stupid. That delta y would then have been like a quadratic, right? The equation I subbed into into made t=0 (v=u+at : I'm not stupid... I think exam stress got to me...) So I only ended up stopping at writing down the equation delta x = ux*t. (Except I kinda stupidly crossed it out... so I don't think the markers would count it).
    But thanks for that.

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    Re: Physics Exam Thoughts

    Quote Originally Posted by silverdawn565 View Post
    Oh. *fp* Now I feel stupid. That delta y would then have been like a quadratic, right? The equation I subbed into into made t=0 (v=u+at : I'm not stupid... I think exam stress got to me...) So I only ended up stopping at writing down the equation delta x = ux*t. (Except I kinda stupidly crossed it out... so I don't think the markers would count it).
    But thanks for that.
    All good stress gets to everyone!
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    Re: Physics Exam Thoughts

    Quote Originally Posted by james yuan View Post
    What did you guys write for the reentry + radiation question?
    First part, I talked about g-force and heat and how the safe angle is between 5.2-7.2 degrees and 10 degrees exceeds that.

    Um for radiation one I had no clue tbh. I wrote something about light and heat energy and having to reduce the heat on the spacecraft (ceramic plates?). I'm pretty positive I'm probably incorrect for that though.... but for the sake of writing 'something' down.
    Last edited by silverdawn565; 30 Oct 2017 at 2:22 PM. Reason: Edited first sentence.

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    Re: Physics Exam Thoughts

    Wasn't too bad, screwed up on magnetic flux question (got density and flux definitions confused), radiation q had no idea. What should scaling be like for this exam?

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    Re: Physics Exam Thoughts

    Quote Originally Posted by camstu View Post
    Wasn't too bad, screwed up on magnetic flux question (got density and flux definitions confused), radiation q had no idea. What should scaling be like for this exam?
    Maybe 77-80 b6 cutoff I think
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    Re: Physics Exam Thoughts

    Was it wrong to for the flux density to use the max flux and divide it by the area of the circle loop (It didn't say the loop was circular nor that the given length was the diameter, so idk if what i did was right)

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    Re: Physics Exam Thoughts

    That's what I did. If you didn't assume it was a circle, how would you calculate area?
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    Re: Physics Exam Thoughts

    Quote Originally Posted by NinjaDatHSC View Post
    Was it wrong to for the flux density to use the max flux and divide it by the area of the circle loop (It didn't say the loop was circular nor that the given length was the diameter, so idk if what i did was right)
    Pretty sure you had to assume that was true
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    Re: Physics Exam Thoughts

    I have no clue by my friend was confident to say that you had to find the "area under the curve" from the flux vs time graph - which idk if that made sense

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    Re: Physics Exam Thoughts

    lmfao i did pi(r) ^2 xD
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    Re: Physics Exam Thoughts

    Magnetic field strength is flux per unit area. The maximum flux on the flux vs time graph was 0.6Wb I think so the maximum magnetic field strength over the 12 seconds would be 0.6/Area of the loop. Then for part b), the rate of change of flux (flux vs time) is the gradient of the curve which is voltage and then you use the right hand grip rule or something else to find direction. I don't think you had to find the area under the flux vs time curve for anything and you really couldn't do so either because part of it was curved if I remember correctly.
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