2016ers Chit-Chat Thread (11 Viewers)

[leehuan]

he said he used 4U mechanics though, so idk what he actually did
he used it to check if it was a curve

The sample answers look somewhat curved. They had corners.

I forgot why that's a corner and not smooth?

 

[InteGrand]

he said he used 4U mechanics though, so idk what he actually did
he used it to check if it was a curve

I'm guessing he used calculus then, 4U mechanics is mostly calculus-based (apart from some circular motion stuff, which doesn't seem relevant for that Q.).

 

[leehuan]

I'm guessing he used calculus then, 4U mechanics is mostly calculus-based (apart from some circular motion stuff, which doesn't seem relevant for that Q.).

Yeah I couldn't quite puzzle out how mechanics was used for that one.

Was it really that one?

 

[Paradoxica]

hypothetical strange situation: x amount of new friends think we are close after one month of concentrated interactions. I have already analysed their personalities and concluded that this friendship cannot hold in the long run.

what is best doings for this person such that there will be no collateral damage and ultimately cutting off friendship?

make up excuses

 

[InteGrand]

Yeah I couldn't quite puzzle out how mechanics was used for that one.

Was it really that one?

It's a combination of resisted motion and the Faraday-Lenz Law I believe.

I see the sample answers didn't explain the curved nature of the graph, although that is probably due to the fact that this actually would need calculus to explain, and that's not assumed knowledge for HSC Physics. For this reason, I think that you'd have gotten the marks even if you'd drawn the line as straight; the main thing they cared about I think was that it was initially steady, then decreased, and then steadied again.

The question would've been even more fun if the copper plate were circular in shape.

 

[leehuan]

It's a combination of resisted motion and the Faraday-Lenz Law I believe.

I see the sample answers didn't explain the curved nature of the graph, although that is probably due to the fact that this actually would need calculus to explain, and that's not assumed knowledge for HSC Physics. For this reason, I think that you'd have gotten the marks even if you'd drawn the line as straight; the main thing they cared about I think was that it was initially steady, then decreased, and then steadied again.

Except whilst induced EMF = -n delta(phi)/delta(t) I'm not sure how you can pull force or acceleration out of it. Probably missed something.

 

[Nailgun]

The sample answers look somewhat curved. They had corners.

I forgot why that's a corner and not smooth?

I think they would have accepted somewhat curved edges assuming it went to straight line quickly, it's just that the force decreases to neglible rates as the distance increases and so the speed returns to a constant

this is because as you get farther away from the magnetic field the strength decreases with distance B = kI/d, and so the deceleration effect from Lenz's Law is diminished

the marking criteria just says show where the velocity is decreasing and constant clearly, so constant at first, decreasing, then constant

 

[leehuan]

I think they would have accepted somewhat curved edges assuming it went to straight line quickly, it's just that the force decreases to neglible rates as the distance increases and so the speed returns to a constant

this is because as you get farther away from the magnetic field the strength decreases with distance B = kI/d, and so the deceleration effect from Lenz's Law is diminished

the marking criteria just says show where the velocity is decreasing and constant clearly, so constant at first, decreasing, then constant

Of course, when I did the question I also made it clear that it decreased a bit and was constant everywhere else.

Only the corners threw me off when I read their response tbh.

 

[Nailgun]

It's a combination of resisted motion and the Faraday-Lenz Law I believe.

I see the sample answers didn't explain the curved nature of the graph, although that is probably due to the fact that this actually would need calculus to explain, and that's not assumed knowledge for HSC Physics. For this reason, I think that you'd have gotten the marks even if you'd drawn the line as straight; the main thing they cared about I think was that it was initially steady, then decreased, and then steadied again.

The question would've been even more fun if the copper plate were circular in shape.

I'm wracking my brain but I don't see how this would make a difference ahaha
care to explain lele


btw

acceleration = -k







Where W is the final speed even though k is changing it gave me a rough estimate of what the graph looked like.

 

[InteGrand]

I'm wracking my brain but I don't see how this would make a difference ahaha
care to explain lele


btw

With the circle thing, I believe it would affect it because the circle's shape means that it as it enters a magnetic field, the area entering is not constant per unit length entered (because cross-sectional lines of a circle aren't constant in length). And ε = –N.dΦ/dt. Since the flux is Φ(t) = B*A(t), the "area entering per unit time" (A(t)) is more complicated with a circle than with a rectangle (which is still non-trivial due to the fact that the copper plate doesn't come in at a constant speed, since it already starts slowing down).

 

[leehuan]

Ahh... yeah I wouldn't have jumped anywhere near that

 

[Nailgun]

Well there, Drsoccerball assumed the acceleration is a negative constant; this is equivalent to assuming that the velocity graph would be a straight line in the decreasing section.

With the circle thing, I believe it would affect it because the circle's shape means that it as it enters a magnetic field, the area entering is not constant per unit length entered (because cross-sectional lines of a circle aren't constant in length). And ε = –N.dΦ/dt. Since the flux is Φ(t) = B*A(t), the "area entering per unit time" (A(t)) is more complicated with a circle than with a rectangle (which is still non-trivial due to the fact that the copper plate doesn't come in at a constant speed, since it already starts slowing down).

even then though, wouldn't the eddy currents still like 'fill' the whole conducting plate
and so it would still slow down due to their interaction
and then the graph would look the same?

 

[WrittenLoveLetters]

Just finished 2U. Had one question (4 marks) that I had to bullshit as much to get maybe 1 or 2 marks. BUT THEN MY DUMBASS IN MC CALCULATED SOMETHING TO BE 8(PI)/3 AND MY DUMBASS CIRCLED THE WRONG ANSWER HEELFSKWLSJALXHSLSHWONWOSW FUCK

I see TAFE at the end of the tunnel //dies

 

[Shuuya]

Just finished 2U. Had one question (4 marks) that I had to bullshit as much to get maybe 1 or 2 marks. BUT THEN MY DUMBASS IN MC CALCULATED SOMETHING TO BE 8(PI)/3 AND MY DUMBASS CIRCLED THE WRONG ANSWER HEELFSKWLSJALXHSLSHWONWOSW FUCK

I see TAFE at the end of the tunnel //dies

I labelled x intercepts as (0,something) on one of the easiest graphing questions in the paper ._.

 

[StudiousStudent]

Just finished 2U. Had one question (4 marks) that I had to bullshit as much to get maybe 1 or 2 marks. BUT THEN MY DUMBASS IN MC CALCULATED SOMETHING TO BE 8(PI)/3 AND MY DUMBASS CIRCLED THE WRONG ANSWER HEELFSKWLSJALXHSLSHWONWOSW FUCK

I see TAFE at the end of the tunnel //dies

Guarantee you performed better than I did in my bio exam yesterday. I actually circled a wrong answer too, and I realised only after the test concluded. It was on sa/vol ffs (only been doing that since year 7).

My teacher is going to be reduced to tears.

 

[leehuan]

This is why we write student numbers on papers guys. Shh the teachers might not recognise your student number on a multiple choice answer sheet until they give it back

But, I mean, oh dear ._.


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[Sien]

4.5 pages of bs for English
I hope i can get an ok mark
#pray4sien

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[leehuan]

4.5 pages of bs for English
I hope i can get an ok mark
#pray4sien

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#pray4sien

 

[StudiousStudent]

4.5 pages of bs for English
I hope i can get an ok mark
#pray4sien

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I hope you shine

What did you have to write about?

 

[Sien]

I hope you shine

What did you have to write about?

Fenks
Mod c, power and politics

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