HSC Physics Question Thread

[jamonwindeyer]

Question 9 on this sheet.

Yeah I think there might be a piece of information missing! You can tell because the question right below it gives the same information, plus one bit extra. I don't think the information given in Question 9 is enough could just be a 'faulty' question?

[Aaron12038488]

I just finished year 10 and going to Year 11 next year
Is it good to start on the syllabus now for physics
Thanks,

Also, The first dot point which is Describe the energy transformations required in a mobile phone, is this satisfactory.

Spoiler

Sound Waves (voice) converted into electrical signals via microphone. Digitised (binary code) is transmitted as radio waves to base station. Each base station is connected to switching centre by an optic fibre network that carries signal as electrical impulses- produced by radio wave energy interacting with aerial. Switching centres are connected to other switching centres and base stations.
Sound Energy → Electrical Signals → Transmitted as Radio Waves → Light Energy → Sound Energy
Call between mobile and landline at the base station – signal is converted to light and will travel along an optic fibre network to distant to switching centre. Call between centre will be transformed to another switching centre close to a base station near the receiving mobile. The signal is then fed to the base station as an electrical signal and is broadcast as radio waves. In the mobile, radio waves are converted to electrical impulses which is then converted to sound from the speakers.

Call between mobile and landline at the base station – signal is converted to light and will travel along an optic fibre network to distant to switching centre. Call between centre will be transformed to another switching centre close to a base station near the receiving mobile. The signal is then fed to the base station as an electrical signal and is broadcast as radio waves. In the mobile, radio waves are converted to electrical impulses which is then converted to sound from the speakers.

I've started the Physics Prelim Syllabus as my yearly report for science was very dismal. As I'm doing Physics, Chem and Bio, I'm really anxious in how I will perform in Year 11 and 12. Thoughts??

Mod Edit: Merged posts and added spoiler. You can use the 'Modify' button on the top right to add to your post to avoid posting twice in a row

[jamonwindeyer]

Hey Aaron! Welcome to the forums 

Personally, I'd just chill out these holidays. You can do a bit of light reading if you like of course, but the Year 11 content doesn't impact your HSC, and it is important to have a break before the hard work begins. I admire your drive, but you can probably reign it in a bit, there is definitely no need to start Year 11 content this early

In saying that, seems like you have a great understanding of the first dot point!!

Don't stress about your Year 10 Science results; HSC science is completely different. New skills, new start. If you work really hard then there is no reason for any of that to be reflected in your senior studies!

[bluecookie]

What does the 'position' in a position time graph mean? Is it the distance or displacement or something else?

[RuiAce]

What does the 'position' in a position time graph mean? Is it the distance or displacement or something else?

In physics, position is just another word for displacement.

[jamonwindeyer]

What does the 'position' in a position time graph mean? Is it the distance or displacement or something else?

Welcome to the forums bluecookie! let me know if you need a hand finding things

[bluecookie]

In physics, position is just another word for displacement.

Thank you! 

Welcome to the forums bluecookie! let me know if you need a hand finding things

Thanks

Mod Edit: Merged posts. You can use the 'Insert Quote' button below your typing window to add quotes from multiple users

[bluecookie]

What does the area under a displacement velocity graph represent?

[RuiAce]

What does the area under a displacement velocity graph represent?

Check what you said. This is not in the HSC physics course. All graphs are something-time graphs.

Note, however, the area under a velocity-time graph represents the displacement travelled over that period of time.

[bluecookie]

Check what you said. This is not in the HSC physics course. All graphs are something-time graphs.

Note, however, the area under a velocity-time graph represents the displacement travelled over that period of time.

Sorry, I meant displacement time graph.

[Jakeybaby]

Sorry, I meant displacement time graph.

I can't see that value having any important physical meaning, nor can I see it being tested at HSC level. I imagine it is just what you said, the area under a displacementp-time graph, nothing more, nothing less.

[RuiAce]

Sorry, I meant displacement time graph.

Precisely as mentioned above. It is of no use whatsoever.

(Mathematically, integrating the displacement tells us nothing useful)

It's just like how the slope of the acceleration-time graph is of no use (in the HSC course that is; in the real world of physics it's called jerk)

[Aaron12038488]

I was wondering how you make notes. I want to get in the habit of making notes sooner so I get the general jist and will be fine when exams come up.

[jamonwindeyer]

I was wondering how you make notes. I want to get in the habit of making notes sooner so I get the general jist and will be fine when exams come up.

Hey Aaron! There are all sorts of good things to do, but the main thing I'd recommend is to make sure they are completely based off the syllabus dot points. That will make sure that you don't miss anything. I also, personally, think it is better to write your notes progressively as you learn the content, not in big chunks

Besides that, this article might be worth a read

[Aaron12038488]

Thanks for the rapid reply. Also for Year 11, will all the tests and Pracs be based on the Syllabus Dot Points?