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March 29, 2024, 11:42:53 pm

Author Topic: VCE Physics Question Thread!  (Read 603590 times)  Share 

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Stevensmay

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Re: VCE Physics Question Thread!
« Reply #435 on: April 30, 2014, 09:09:15 pm »
+2
Thanks Zealous, just realized I typed in 1.7 and not 0.7 by mistake.

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Re: VCE Physics Question Thread!
« Reply #436 on: April 30, 2014, 09:09:57 pm »
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Looks alright?





If we define downwards as being positive, our change in x (of the spring) will be a positive value as well as our acceleration of gravity so I don't think we'll encounter any negative answers.

Thanks guys!
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Alwin

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Re: VCE Physics Question Thread!
« Reply #437 on: April 30, 2014, 10:22:59 pm »
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Diodes, resistors, LEDS, globes (it has more things but we are allowed to only use these)

Are you allowed to use a multimeter (or voltmeter/ammeter)??

This would considerably help with designing an experiment because you could measure the voltage and current (and hence calculate power) across components rather than buying some fancy device to measure light intensity of an LED.

If you were allowed these measuring devices, a simple (but hard depending if you're allowed a variable resistor or not) is you could vary the current in the circuit by adding resistors and measure the voltage across the diode (with an LED to dissipate excess power). Then plot voltage vs current and find the switch on voltage
(note that this could be VERY hard if you only have large-sized resistors, so google the diode before hand to see what the Vs is)

Otherwise, as others have suggested, you can create a variety of circuits and analyse. It all depends on what your teacher wants :)
(Perhaps even find someone who did Physics last year from your school and ask what they did, but don't do the exact some thing :P)

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Rishi97

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Re: VCE Physics Question Thread!
« Reply #438 on: May 01, 2014, 03:58:41 pm »
0
Thanks for all your help guys...
Great news!!! I found what I want to do my EPI on.
I'm going to measure the effects of varying reistance has on the power outage of a light bulb. I'm also measuring current as the voltage will remain the same
It's simple but I didn't want to do anything over the required. Like I said, I'm not that good at physics :-\
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speedy

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Re: VCE Physics Question Thread!
« Reply #439 on: May 16, 2014, 10:10:32 pm »
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Ok I have no idea how to do this:

a) V1 decreases due to the negative gradient of the graph and I thought that V2 would stay the same due to it being in photocurrent mode but the answer says it increases.

b) This is where I really had no idea. The units for the graph is mW/m2 but we're given 3 W/m2 so I don't understand how we can use that graph. We can determine the current to be 15 microAmps from the other graph. But yeah that's all I get.

Question:
Spoiler

Graphs:
V1
Spoiler
V2
Spoiler
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RKTR

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Re: VCE Physics Question Thread!
« Reply #440 on: May 16, 2014, 11:49:07 pm »
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3Wm^-2 =3000mWm^-2
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speedy

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Re: VCE Physics Question Thread!
« Reply #441 on: May 17, 2014, 12:21:52 am »
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3Wm^-2 =3000mWm^-2

Oh my god I am so stupid. For some reason I was thinking the units for the graph were mega watt / m^2... Thanks for the help!
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Einstein

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Re: VCE Physics Question Thread!
« Reply #442 on: May 17, 2014, 12:34:15 pm »
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Does anyone know any good youtube channels to watch vce physics 1/2 videos?

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Re: VCE Physics Question Thread!
« Reply #443 on: May 19, 2014, 10:21:35 pm »
+1
Does anyone know any good youtube channels to watch vce physics 1/2 videos?

This might help http://www.youtube.com/user/lowdownonphysics
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Rishi97

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Re: VCE Physics Question Thread!
« Reply #444 on: May 20, 2014, 06:53:35 pm »
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Is anyone going to the TSFX Physics lecture this weekend???
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Rod

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Re: VCE Physics Question Thread!
« Reply #445 on: May 20, 2014, 08:27:35 pm »
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Is anyone going to the TSFX Physics lecture this weekend???
nah, are you?
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Re: VCE Physics Question Thread!
« Reply #446 on: May 20, 2014, 09:38:16 pm »
+1
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speedy

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Re: VCE Physics Question Thread!
« Reply #447 on: May 21, 2014, 09:05:52 pm »
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Quick question:
Spoiler

Generally with these graphs, to find gain must you find the gradient (rise/run) or can you just go Vout/Vin for any value? Because I was taught the latter but for this question that is wrong (must use gradient).
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rhinwarr

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Re: VCE Physics Question Thread!
« Reply #448 on: May 22, 2014, 04:30:31 pm »
+1
I think you should always use the gradient because I THINK with graphs like these if it doesn't go through zero, the Vout/Vin doesn't work.

Nato

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Re: VCE Physics Question Thread!
« Reply #449 on: May 22, 2014, 04:50:09 pm »
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Quick question:
Spoiler

Generally with these graphs, to find gain must you find the gradient (rise/run) or can you just go Vout/Vin for any value? Because I was taught the latter but for this question that is wrong (must use gradient).

In this situation, you can't just do Vout/Vin.
That works for when the line passes through the origin.
but in this case, the graph has been shifted - so when you simply do Vout/Vin, you are not taking the shifting of the graph into consideration.
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