Great! Although i dont have any specific questions now i definitely will in the near future!And although I didn't do this subject, will try to help out as much as possible!
Our teacher gave us a bunch of summaries if anyone wants them - our lessons are outside the timetable so we have to learn it ourselves for the most part.
Does anyone know what this dot point means?
9.3.2.B (Bionics, topic 2 - Heart and Flow of Blood)
Plan and perform an investigation to identify individual aspects that comprise the heartbeat.
What does it mean by individual aspects?
lub-dup---lub-dup---(note the dashes are representative of time)
eg lub---dup------lub---dup------
eg lubdup-lubdup-lubdup-
For this experiment i used a ecg (electrocardiogram) with points labelled p,q, r, s, t (if you havent done this let me know and ill explain this) and a stethoscope to see if all of us had 'normal' hearts.
Like all science methods, we wrote a prac report and concluded that we all have normal hearts. Our discussion was as these conditions are quite rare we expected (hypothesised) that none of us had faulty heart conditions that we didnt know about.
We didn't do that experiment - that's probably why I am so lost - I knew partially about the lub dup thing, but that still helped. Would you be able to explain the electrocardiogram? I found the page in my textbook that talks about all of this but like it doesn't what the p, q, r, s and t stand for/represent.Hey jnicko, sure!
Hey jnicko, sure!
The best way I can show this to you is through a diagram, so one should be attached.
The electrocardiogram is quite simply defined as a test which tests the electrical activity of the heart (eg the ventricular and aortic valves) to detect problems. It is the typical wave that comes out of the monitor that you see everywhere (like the one that beeps on TV when the patient is alive and flatlines when there is no pulse ;D).
It is important to note however, a "beat" is from P to P, and not from P to T (some textbooks/sources use a "U" as resting time as well but most don't- just putting it out there)
Hope this helps otherwise feel free to ask :)
Awesome explanation, fantastic diagram, studybuddy you're a legend.
Hi Ragdolls! Thanks for joining atarnotes! Its great youre posting questions!
(I just lost all of this work that I was just about to post so bear with me if i cut things short)
Lets start with the ECG.
I'll use the terms depolarisation (meaning contracting/contraction) and repolarisation (meaning relaxing/relaxation) as these are the terminology that youll be wanting to use in your response to wow the marker :D
Point P represents the contraction (depolarisation) of the atria (note: plural of atrium, they are in sync)
Points Q, R and S (QRS complex) represents the simultaneous depolarisation of the ventricles and the repolarisation of the atria. It is important to note how fast this complex works. Anything considers above 0.11 seconds is considered abnormal, with 0.08-0.09 seconds considered average.
Point T represents the repolarisation of the ventricles
Point U (I only put this in as it is in some textbooks and so you might get a question on it, but I wouldnt exactly stress this) is simply the resting stage between points P and U, where neither atrium or ventricle is depolarisating or repolarising.
I'll post this before I lose it again and i hope this helps :D
No probs ragdoll enjoy :)
Are you ok with the SA node? It basically works by sending rhythmic electrical impulses to the heart. Its basically there to keep your heart pumping around blood which if, as you know didnt happen, your cells would lyse suffer from 'malnutrition' (idk proper term lol) and you would die.
If you need any greater depth of knowledge feel free to ask me or drop me a msg. Either one is totally fine :)
Hey jnicko, sure!
The best way I can show this to you is through a diagram, so one should be attached.
The electrocardiogram is quite simply defined as a test which tests the electrical activity of the heart (eg the ventricular and aortic valves) to detect problems. It is the typical wave that comes out of the monitor that you see everywhere (like the one that beeps on TV when the patient is alive and flatlines when there is no pulse ;D).
It is important to note however, a "beat" is from P to P, and not from P to T (some textbooks/sources use a "U" as resting time as well but most don't- just putting it out there)
Hope this helps otherwise feel free to ask :)
Just wondering, but if a question asks for how visible light is used in information systems, could you talk about how we use it for vision? Or is it limited to optical fibres (some of my notes are conflicting)Hey AngelicOnyx, sorry for the delay.
EDIT: Also dont forget that infra-red can be classified under visible lightWait what?
Wait what?
Technically speaking infra-red can be classified under visible light as you can see laser beams shining. Hence it is a form of communication. The same cannot be said for ultraviolet light simply because you cannot see it.I thought that red light was just because it emits a bit of red light as well. Not it was also IR.
Just obviously remember it is a different wavelength to visible light
I thought that red light was just because it emits a bit of red light as well. Not it was also IR.
I'm having trouble following. Infrared light emits red light yes. Red light that we can see. Hence it can be used as a visual communication. Not ideal in my opinion, but the option is there.Well that's really just utilising the red light that gets emitted alongside IR in my opinion.
Well that's really just utilising the red light that gets emitted alongside IR in my opinion.Well this is Senior Science not Physics. People seem to be a bit more relaxed on the technicalities here as some people are lucky to remember the difference between IR and visible light ;D
Hey AngelicOnyx, sorry for the delay.
Visible light is used in Information Systems. So while you could talk about how we use it for vision, I don't recommend it as vision is a very limited communication. You don't just have to just limit it to optical fibres however.
Actually for vision, you could go on the path of talking about non-verbal communications (eg billboards, smoke signals, posters, mail etc) as vision is needed for it, but don't go talking about how are eyes are important because we see out of them. Sorry if I'm conflicting as well but I'm doing my best and information systems isn't my best topic.
EDIT: Also dont forget that infra-red can be classified under visible light so the use of laser beams and all that could also be brought in to the discussion.
We only really need to know the very basics. Eg
If 110 codes for 6
and 1011 codes for 11
What does 1111 code for?
a) 12
b) 15
c) 16
d) 20
Answer is below!SpoilerThe answer is B (looking at the BBcode for this is confusing lol ;D)
Got it right? Congratulations!
Got it wrong? Don't worry there is an easy way to remember.
23+22+21+20= binary code.
There is 1 in the 23 coloumn, so +8. There is also a 1 in the 22 coloumn (+4) 21 (+2) and 20 columns (+1)
Add up 8+4+2+1 and you will get 15!
Say 1001 for example. It would be 9 because there is a 1 in the 20 and a 1 in the 23 column. This is 8+1 = 9.
Hope this helps!
OMG THANK YOU
this trick is so much easier to under stand
So my prediction for:
1011 = 8 + 0 + 2 + 1 = 11?
Guys whats the energy transformation in a fax machine? Thanks a bunchhOn the receiving end, it is just
"Identify a firsthand investigation where a data logger may be used and state an advantage of using the data logger.(2)"
How would you guys answer this question?
I did something under the lines of :
"a datalogger can be used when determining trends in the temperature of a certain place over a period of time. An advantage of using a data logger is that you do not need to be physically there for the experiment, as the device will automatically record information for you "
Hey Guys,
Anyone know what happens in the information transfer process? Like message/encode, transmission, decode? Are we supposed to know what happens in detail or just briefly?
Hey
Can anyone tell me what to write for the history of a pacemaker?
thanks
Hey kawther,
Yeah it wouldn't hurt to know a bit more in depth but normally this is a multiple choice or 1-2 marker saying basically what is the info transfer process?
Thus you just need to know encode, transmit, decode. It is largely self explanatory from there.
Eg The message gets coded, it gets transmitted by satellite, tower (for eg) and then gets decoded so one can read it,
Hope this helps :)
Hey1950s - pacemakers were large external devices that worked on AC
Can anyone tell me what to write for the history of a pacemaker?
thanks
Hey! :)
I'm Year 11- does anyone have any effective ways/tips to study for Senior science???
Hi!
Does anyone know the response to this point: 'identify the transformation of energy at each stage of information transfer in the following device' but for Mobile Phones?
Thanks!
do u mean this?
sound-electrical (sent to switching centre)-electromagnetic (microwave)- electrical- sound
or
sound-coded in mic- transmitted via microwaves from tower to tower- detected by receiving mobile- decoded- sound
i think they r basically the same- just 2 sets of notes saying 2 different things (always ideal the night before the exam) :D
hope that helps
guys im so confused, is an emulsifying agent and an emulsifier the same thing? or are they different because I have different explanations for both.
it'll also be great if someone could clarify what an emulsion is. :)
Hey guys,
For information systems, how does total internal reflection relate to optical fibres?
& is there a communication process for optical fibres?
just a quick question...
my class for senior science doesnt event try...for example, half yearlys, one person got band 4 the rest got 3 and below.
fast forward to trials, only like 4 people made it to band 3 (thankfully, i came second for my exam, mark is still horrible) and majority got band 1s.
my teacher has supported us ever since we walked in that room. however, after trial results, she didnt do what she normally did; yell at us. this is where my heart sunk because i feel like she gave up on us, and i pretty much understand why. more than half of the people in my class dont even study.
however, this does not stop me from trying MY best. she even let us know we were one of the worst and the most unseuccessful class she's ever had. it made me sad because she started to tear up.
4 students, on the last day, told her straight up that there was another class having a party and they wanted to go. "okay go, i hope it helps you with your atar" was her response.
here is the question.....if i, for example, get a band 4, but only like 3 or 4 get band 4 and rest get below, would that affect us IMMENSELY?
just a quick question...
my class for senior science doesnt event try...for example, half yearlys, one person got band 4 the rest got 3 and below.
fast forward to trials, only like 4 people made it to band 3 (thankfully, i came second for my exam, mark is still horrible) and majority got band 1s.
my teacher has supported us ever since we walked in that room. however, after trial results, she didnt do what she normally did; yell at us. this is where my heart sunk because i feel like she gave up on us, and i pretty much understand why. more than half of the people in my class dont even study.
however, this does not stop me from trying MY best. she even let us know we were one of the worst and the most unseuccessful class she's ever had. it made me sad because she started to tear up.
4 students, on the last day, told her straight up that there was another class having a party and they wanted to go. "okay go, i hope it helps you with your atar" was her response.
here is the question.....if i, for example, get a band 4, but only like 3 or 4 get band 4 and rest get below, would that affect us IMMENSELY?
Major shout out to your teacher, first of all. It sounds like she really cares, and that most of your peers just don't. That's such a shame :(
For you though, since it sounds like you are performing near the top of the cohort, it won't matter. Here is a guide on the process, but to cut out the stuff you don't need, your marks are moderated such that if there are big differences, they stay there. Meaning if the majority of your class is sitting way down below the few of you who do try, their results won't affect yours. It's a complicated process, but that's the end outcome!
Your focus should still be to maximise your HSC results, it's not a free pass by any means - But I wouldn't be worried. NESA rewards those who put the effort in, even if their class doesn't :)
hey im in a similar situation - my cohort is really small, probably 10 i'd say???
anyways, we have some 60s 70s 80s one 90
i think if youre doing well you should be fine, but ss is a v low scaler so if you stuff up
youve stuffed up big time tbh
is the thredbo landslide a consequence of both human induced and natural combined?
if so, what was the natural?
thanks!
hey guys,
how would you accurately estimate a question like this?
Just a gentle reminder everyone not to double post if one post will do the trick :)
oh, i didnt know we couldnt double post. whats the problem with it?just makes the forum look messy...
heyy,
can someone please help me with this dot point?
thankyouu!!
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describe the effect of the slope of the land and intensity of the wind on the speed of the bushfire