Howdy! Could someone please help me out with this question:
The period of revolution of the planet Saturn around the Sun is 30 times that of Earth. Determine how many times further Saturn is from the Sun than Earth.
A) 3.1
B) 5.5
C) 9.7
D) 30
The answer is C but I have not clue how they got there. The marking scheme stated the T2/r3 = 4pi2/GM formula.
-jinx_58
jinx_58
Just replied in the "Urgent External Exam Questions" thread 
.
Hii, am I still able to ask questions on this thread? If so, is it possible if I get feedback throughout my student experiment (and research question if possible) for physics (when we start working on it)? We are usually put in the same groups, but the group I has is way smarter than me, like they get 19 out of 20s, while I suffer with a 15 out of 20, but I'd really like to get better grades at least above an 18 this time?
Bibliii
Hey Bibliii,
You can certainly ask questions on any of the threads in the forum and definitely in this one (as long as its physics related 
). If you mean feedback from your teacher, you should most likely be able to get feedback for certain sections of your assignment if you ask your teacher nicely. Our teachers didn't really; it was more like answering questions for us. However, I would imagine your teacher can't help you every step of the way with your assignment.
On here, though, feel free to post any questions, or sections of your assignment to receive feedback. Just like everyone else, I would be more than happy to assist you in providing feedback.
Hope that helps!
PhytoPlankton ahhh thank you so much. No I was just wondering if I could post and get help here, because my teacher constantly singles me out as I am not doing very well in physics (I average to below a C) and I'd really like to prove to myself and to her that I am better than that. She never gives me feedback, and when she does it's too complex or too simple and not enough. I try to work very hard, but it's never enough, so yeah any help from anyone except her is much appreciated!
Bibliii
All good and yeah, that does sound like a pain. You certainly can get feedback and help here whenever you need it. I have created a thread for urgent help for external exams but I will also create another one for urgent questions if you have a question the day before an assessment is due as well.
There'll be people around to help.
PhytoPlankton thank you so much!! Honestly you're all better than my teachers at school
Hiii,
Could anyone please explain the right hand rule for electromagnetism. Also what does conventional current mean (is it the positive to negative or something like that is flippity flopped?)
Thank youu
Hi Bibliii,
Conventional current is what we use to describe most circuits. It is the flow of charge (specifically positive charge).
In chemistry, you view current as the flow of electrons. But because electrons are negatively charged, and old science people were stupid and thought they were positive, it is in the opposite direction.
All u need to know is that conventional current flows from positive + to negative -!
Where as the electrons flow from negative to positive.
2) In terms of the āright hand ruleā there are two main ones.
If itās an electron, which is negative, u point ur thumb in the opposite direction to the electrons movement.
There are two more, one for Lenzās law: which is finding which direction the current must flow when a coil of wire is moved in a magnetic field. And one for finding the north/South Pole of a coil of wire (solenoid). But u can also use the magnetic field one instead, it just hurts ur head a bit more.
Hope this helps,
-G
Hiii, I finally got drive to work so now I can share images.
These are my physics homework questions, that I cannot do for the life of me (because content goes too fast, and my teacher loves to single me out because im the slowest learner in the class and because she is completely racist). I attempted drawing on the worksheet (question 1) it has diagrams and isn't one of the Pearson's questions. I can't answer any though, because I am so bad at physics right now. And my tutor didn't give me any notice before telling me that she couldn't tutor any more (though she has a new job, so good for her ig). But yeah, I am quite literally freaking out and there are so many questions, not too mention whole entire chapters to read. So yeah, life's been a bit hectic.
If any of you could help by even answering just one question, you would be a lifesaver. Thanks, 
Bibliii
For the first image, I had trouble with 5) aswell in yr 12 haha, so hereās @PhytoPlankton answer: https://imgur.io/a/asiRhTD
These two links should help with the rest of that first image:
https://ibb.co/WpRxJJZ
https://ibb.co/tQHqm5j
-jinx_58
Bibliii
Thanks @jinx_58 for your reply!
Hey Biblii,
Here is the link to the solutions for the rest of your questions in the last four images (I've combined the 8.1&8.2 Review questions and I combined the physics WS p1&2): https://imgur.com/a/JSg6pso.
Sorry for my messy handwriting and image drawings - I was doing this in a hurry 
. Nevertheless, hope this helps and as always, feel free to ask more questions.
EDIT: now that I quickly check over my workings, I notice there are a few spelling and grammar issues. Just try and ignore them - sorry!
PhytoPlankton and jinx_58
Hii, first of all, thank you for responding to this faster than my teacher has ever (I panicked and sent her an email saying I was sorry if I hadn't completed the homework). I just wanted to clarify a few things with the questions.
For question 3 on 8.1 review, the answer you wrote was the "north pole of the magnet will point as geographic north which is the magnetic south pole". Does that mean that the magnet is facing magnetic south pole (the north part at least)? Sorry, I'm just a bit confused. Also with the calculations for all the answers that involved actual maths, it's just subbing in information into the formula and then just using ratios sometimes?
For 8.2 review wouldn't question 5 and 6's answers be switched because A is closer to LHS which is west (for question 5), or is my brain just disintegrating.
For the worksheet, (d) Aluminium metal is not affected by a magnet. Can an aluminium wire create a magnetic field? The answer would be no, wouldn't it. Because magnets only work in magnetic fields, right?
Thank you both so much for answering those questions, you all will now be given the "saved my butt award".
P.S. PhytoPlankton your handwriting is literally so neat, so umm not sure what you're talking about haha. Nevertheless thank youuu to both of you guys!!
Bibliii
For question 3 on the 8.1 Review, thereās this concept that the geographic North Pole - where Santa supposedly lives - is scientifically a South Pole. This is because the geographic North Pole attracts other magnetic North Poles.
I hope this diagram helps: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSqTPohiHrQQezAvOsUd-BBOOAuaK1PDzBIOw&usqp=CAU
Idk if that makes sense but feel free to ask more questions.
Also with the āmagnets only work in magnet fieldsā thing, that not how it works. A magnet creates its own magnetic field. Every single one. So, because the Earth is a giant bar magnet, it creates it own magnetic field.
However, if aluminium wire has a current flowing through it, a magnetic field is present. Any wire with an electric current creates a magnetic field. Check out the syllabus and the syllabus glossary, it really helps to see what QCAA actually want lol.
-jinx_58
Bibliii
Hey Bibliii,
All good - we're all happy to help!
For the 8.2 review questions 5 and 6, it is a bit tricky and I just realised I didn't really explain it that well. So the main thing you need to do is draw the magnetic field lines on both magnets. As soon as you do this, you will notice that since both are north poles, the lines of each one will come towards each other (--> <--). So if we take a look at point A, would the LHS or RHS magnetic field line be stronger? It would definitely be the LHS magnet because it is closer and the RHS magnet would have a much weaker magnetic field line. So, now you need to take both of those magnetic field lines as vectors and find the vector sum so like this: ------> + <--- = --->. And that final arrow is pointing towards East. Does that make sense?
Hope that clears it up and as always, let us know if you have any other questions.
PhytoPlankton yes I do get it now, haha thank you so much for clarifying!! Sorry I didn't reply sooner to you both, the internet in my area sucks rn
Hiii everyone,
I was just wondering if I coul get some help with these physics questions? Also I do have an answer for question 5, which is that it has to be sin and not cos because sin has a minimum value of 0, whereas cos does not (dunno if that's right or makes sense but yeah).
https://drive.google.com/file/d/11yPRllFWncm8MNNbQhlfoXY6ZdrbrbBy/view?usp=sharing
https://drive.google.com/file/d/18FUdb-NU0mGWl0SIxxCB2e_kS4jEGgB4/view?usp=sharing
https://drive.google.com/file/d/1ABEEPwn5TjH3Z5udojgMWyEFrjzqAyQg/view?usp=sharing
Thanks!!
