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September 19, 2025, 05:04:51 pm
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Author Topic: Physics 3/4 Exam Discussion  (Read 13414 times)

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zsteve

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Re: Physics 3/4 Exam Discussion
« Reply #45 on: November 11, 2015, 07:14:34 pm »
At least springs wasn't hammered that bad this year - should have been -16J, 16J and 2.0 m/s for the spring question :3
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bobisnotmyname

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Re: Physics 3/4 Exam Discussion
« Reply #46 on: November 11, 2015, 07:14:39 pm »
was that the one about certain energy levels?
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cooldude123

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Re: Physics 3/4 Exam Discussion
« Reply #47 on: November 11, 2015, 07:14:47 pm »
What did everyone get for Q6d with the graph of acceleration?
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zsteve

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Re: Physics 3/4 Exam Discussion
« Reply #48 on: November 11, 2015, 07:15:09 pm »
C for acceleration - only one that made sense :P
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dankfrank420

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Re: Physics 3/4 Exam Discussion
« Reply #49 on: November 11, 2015, 07:15:32 pm »
Quote from: zsteve on November 11, 2015, 07:14:34 pm
At least springs wasn't hammered that bad this year - should have been -16J, 16J and 2.0 m/s for the spring question :3

It was literally almost exactly the same as last year lol
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zsteve

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Re: Physics 3/4 Exam Discussion
« Reply #50 on: November 11, 2015, 07:16:50 pm »
Quote from: dankfrank420 on November 11, 2015, 07:15:32 pm
It was literally almost exactly the same as last year lol
except they TOLD you that max speed in centre of oscillation. Last year you had to assume that if you didn't want to get involved with some maths and find the max of a quadratic ... like I did :P
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jyce

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Re: Physics 3/4 Exam Discussion
« Reply #51 on: November 11, 2015, 07:17:25 pm »
Quote from: dankfrank420 on November 11, 2015, 07:15:32 pm
It was literally almost exactly the same as last year lol

That's VCE Physics for you.  :P
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dankfrank420

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Re: Physics 3/4 Exam Discussion
« Reply #52 on: November 11, 2015, 07:18:22 pm »
Quote from: zsteve on November 11, 2015, 07:16:50 pm
except they TOLD you that max speed in centre of oscillation. Last year you had to assume that if you didn't want to get involved with some maths and find the max of a quadratic ... like I did :P

Do you think you'll be docked a mark if you only wrote 16J for part a?
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zsteve

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Re: Physics 3/4 Exam Discussion
« Reply #53 on: November 11, 2015, 07:19:47 pm »
Quote from: dankfrank420 on November 11, 2015, 07:18:22 pm
Do you think you'll be docked a mark if you only wrote 16J for part a?
It was asking for change in GPE so I guess negative was req'd, was it a 1 marker?
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dankfrank420

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Re: Physics 3/4 Exam Discussion
« Reply #54 on: November 11, 2015, 07:20:35 pm »
Quote from: zsteve on November 11, 2015, 07:19:47 pm
It was asking for change in GPE so I guess negative was req'd, was it a 1 marker?

Yes
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odeaa

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Re: Physics 3/4 Exam Discussion
« Reply #55 on: November 11, 2015, 07:20:46 pm »
Quote from: Orson on November 11, 2015, 06:54:32 pm
Hey buddy, and I did that as well. So far all my mistakes have been dumb...

I finished with like 10 minutes to go...what did you get on the d-drop question? Also the last electronics graph, I couldn't get it very accurately. I got like 45...


i think i got 25 for the d value, can't remember exactly though

do you mean the gain for the electronics q? i got 50 i think

Quote from: zsteve on November 11, 2015, 07:16:50 pm
except they TOLD you that max speed in centre of oscillation. Last year you had to assume that if you didn't want to get involved with some maths and find the max of a quadratic ... like I did :P

ahah i thought of you when i read that, whats the point if they just give it away?

btw did you get 2m/s for that?
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bobisnotmyname

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Re: Physics 3/4 Exam Discussion
« Reply #56 on: November 11, 2015, 07:26:15 pm »
when is asked for the change in gravitational potential, would it matter if I didn't include the negative
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jyce

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Re: Physics 3/4 Exam Discussion
« Reply #57 on: November 11, 2015, 07:27:27 pm »
Quote from: bobisnotmyname on November 11, 2015, 07:26:15 pm
when is asked for the change in gravitational potential, would it matter if I didn't include the negative

I wouldn't think so??
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odeaa

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Re: Physics 3/4 Exam Discussion
« Reply #58 on: November 11, 2015, 07:29:31 pm »
Quote from: bobisnotmyname on November 11, 2015, 07:26:15 pm
when is asked for the change in gravitational potential, would it matter if I didn't include the negative

i think because it said change and not increase/decrease it is just the magnitude of the change, especially since energy is a scalar

otherwise rip 50
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TimeToogo

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Re: Physics 3/4 Exam Discussion
« Reply #59 on: November 11, 2015, 07:31:24 pm »
I was confused by the wording of question 19 a.

If there was a single atom with a single electron at n=3, how could three photons be emitted?
Wouldn't it either be one photon (drops directly to n=1) or two photons (drops to n=2 then n=1)?

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