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March 28, 2024, 09:59:42 pm

Author Topic: VCE Physics Question Thread!  (Read 603185 times)  Share 

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Bri MT

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Re: VCE Physics Question Thread!
« Reply #2190 on: November 13, 2018, 05:10:21 pm »
+2
I was doing the attached rule. Idk if I'm going crazy but I get a downwards flux.


Remember that the induced current will oppose the change.

DinWell

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Re: VCE Physics Question Thread!
« Reply #2191 on: November 13, 2018, 05:14:08 pm »
0

Remember that the induced current will oppose the change.
Okay, so from the diagram I showed a current going counter clockwise will create field lines going up. Doesn't this oppose the change which is that a downwards flux goes through the coil?
BTW I realise I'm wrong, I'm just trying to understand it.
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DinWell

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Re: VCE Physics Question Thread!
« Reply #2192 on: November 13, 2018, 05:37:17 pm »
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Okay, so from the diagram I showed a current going counter clockwise will create field lines going up. Doesn't this oppose the change which is that a downwards flux goes through the coil?
BTW I realise I'm wrong, I'm just trying to understand it.
Thanks guys. I think I got it. Even though current does flow from Y to X around the coil, it's from X to Y THROUGH THE METER. I didn't pay attention to those three words. I'm very sorry, please excuse my stupidity.
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davie18

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Re: VCE Physics Question Thread!
« Reply #2193 on: November 13, 2018, 05:41:18 pm »
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Can someone clarify, when to use each h value or plancks constant, please.

Bri MT

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Re: VCE Physics Question Thread!
« Reply #2194 on: November 13, 2018, 05:48:05 pm »
+4
Thanks guys. I think I got it. Even though current does flow from Y to X around the coil, it's from X to Y THROUGH THE METER. I didn't pay attention to those three words. I'm very sorry, please excuse my stupidity.

Absolutely nothing to apologise for
Glad you figured it out in the end (and thank you for letting us know once you did); maybe this'll help people avoid making the same error on the exam :)

DinWell

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Re: VCE Physics Question Thread!
« Reply #2195 on: November 13, 2018, 06:34:53 pm »
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I have another question:
Attached are the solutions to the 2018 NHT exam. For 6a the exact answer is 2.0203... which is rounded to 2.0 for the answer. Then for 6b, they use 2.0 for the calculations and get 50m as a result. But if you used the exact answer,, you'd get 50.5m, which will round to 51m. Am I supposed to use rounded figures? Will They accept both answers?
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Bri MT

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Re: VCE Physics Question Thread!
« Reply #2196 on: November 13, 2018, 06:40:02 pm »
+4
I have another question:
Attached are the solutions to the 2018 NHT exam. For 6a the exact answer is 2.0203... which is rounded to 2.0 for the answer. Then for 6b, they use 2.0 for the calculations and get 50m as a result. But if you used the exact answer,, you'd get 50.5m, which will round to 51m. Am I supposed to use rounded figures? Will They accept both answers?

Imo they should accept the answer with the more exact value.
Make sure you clearly show the values you have subbed into the formula and you should be fine

harold17

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Re: VCE Physics Question Thread!
« Reply #2197 on: November 21, 2018, 07:54:20 pm »
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Hey guys, I just finished 1&2 physics and I'm doing 3&4 physics next year. I had my orientation or commencement, whatever you like to call it. (2 periods to get an introduction to year 12 physics and get holiday homework) and my teacher said some things im not too sure about. He said the textbook (Heinemann) has a lot of unnecessary information. Just wondering how accurate this is? also we started some course work and he skipped through a lot of theory, only focusing on the formulas, making the review questions from the textbook pretty confusing (although i ended up reading all the theory). So, basically what im asking is, what do you recommend for learning content? Should i read and get notes for all parts of the textbook as well as math questions? Would be great help if someone could help me out :)

Bri MT

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Re: VCE Physics Question Thread!
« Reply #2198 on: November 21, 2018, 08:22:39 pm »
+1
Hey guys, I just finished 1&2 physics and I'm doing 3&4 physics next year. I had my orientation or commencement, whatever you like to call it. (2 periods to get an introduction to year 12 physics and get holiday homework) and my teacher said some things im not too sure about. He said the textbook (Heinemann) has a lot of unnecessary information. Just wondering how accurate this is? also we started some course work and he skipped through a lot of theory, only focusing on the formulas, making the review questions from the textbook pretty confusing (although i ended up reading all the theory). So, basically what im asking is, what do you recommend for learning content? Should i read and get notes for all parts of the textbook as well as math questions? Would be great help if someone could help me out :)

As a general VCE tip, I doubt there are any textbooks where all of the information is necessary.
I wouldn't recommend making notes for all of the textbook, for physics I made my notes in class, but if this isn't giving you the level of understanding you need I recommend using the study design dot points as your guide.

You should also practise questions that use the formulas and ensure that you understand the formulas. If, for example, you have the formula F= (mv^2)/r, it's very important that you understand what directions F and v are in.


Disclaimer: there are many different valid methods of studying and I can't guarantee that what worked for me will work for you

S200

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Re: VCE Physics Question Thread!
« Reply #2199 on: November 21, 2018, 09:18:34 pm »
+2
Hey guys, I just finished 1&2 physics and I'm doing 3&4 physics next year. I had my orientation or commencement, whatever you like to call it. (2 periods to get an introduction to year 12 physics and get holiday homework) and my teacher said some things im not too sure about. He said the textbook (Heinemann) has a lot of unnecessary information. Just wondering how accurate this is? also we started some course work and he skipped through a lot of theory, only focusing on the formulas, making the review questions from the textbook pretty confusing (although i ended up reading all the theory). So, basically what im asking is, what do you recommend for learning content? Should i read and get notes for all parts of the textbook as well as math questions? Would be great help if someone could help me out :)
I was given the JacPlus book at the start of the year, and I probably opened it all of 5 times.
Almost everything I was taught was from the notes that the teacher had made themselves, and from YouTube videos that we were shown in class.

There is definitely a fair bit of over-information throughout the textbook, and I personally think that the explanations provided were either too technical or lacked clarity, so the more layman notes really worked well.

If you are worried that your teacher is not explaining clearly or you are missing something, you can watch YouTube videos on the subjects or as said above, make your own notes based off the study design...
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captainbobted

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Re: VCE Physics Question Thread!
« Reply #2200 on: December 02, 2018, 03:29:47 pm »
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I read this thing where it said that "electric field lines start and end at 90degrees to the surface, with no gap between the lines and the surface. What does mean? Whats the surface? Why is 90 degrees?

Thank youuuuu! :D

S200

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Re: VCE Physics Question Thread!
« Reply #2201 on: December 02, 2018, 07:33:54 pm »
+2
I read this thing where it said that "electric field lines start and end at 90degrees to the surface, with no gap between the lines and the surface. What does mean? Whats the surface? Why is 90 degrees?

Thank youuuuu! :D
imagine a positively charged plate parallel to a negatively charged plate.
How would you draw the conventional field lines in this instance?
« Last Edit: December 02, 2018, 07:44:36 pm by S200 »
Carpe Vinum

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dream chaser

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Re: VCE Physics Question Thread!
« Reply #2202 on: December 03, 2018, 06:17:59 am »
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Hi Guys,

Can someone please explain to me why we need to calculate the centripetal force in this question. Woudn't the centripetal force always equal the tension force anyway. Or is that only when there is no angle involved? Also, what do they mean "with the horizontal"? And is the centripetal force always equal to the net force acting on the object?
Question is in the attachment. The question is related to Uniform circular motion.

Thanks
« Last Edit: December 03, 2018, 06:43:13 am by dream chaser »

fun_jirachi

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Re: VCE Physics Question Thread!
« Reply #2203 on: December 03, 2018, 06:44:45 am »
+3
Angle to the horizontal sort means the angle enclosed between the line and the section of the horizontal line going to the right.
ie look at this ∠, the angle to the horizontal is roughly 50 degrees (hope this explanation helps)

IN this case, the centripetal force isn't actually equal to the tension force! Note that with an angle you actually get a force triangle :)
Since you don't know the mass or velocity of the ball, you need to find some other way to get the centripetal force. It is in uniform circular motion, so it is a perfectly balanced force triangle. Drawn properly you should get that centripetal force is equal to 12cos10.

Hope this helps (hope i got it right too) :)
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dream chaser

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Re: VCE Physics Question Thread!
« Reply #2204 on: December 03, 2018, 06:58:46 am »
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Okay, thanks for letting me know. Also, how did you get 50 degrees?