Physics Examination Discussion

[lolipopper]

can't believe i misread some of the 6 resistors...what study score will i get if i lose 2 marks and get 148/150 in that exam?

were you able to do the spring question? if you only lost 2, you could get 49-50 i think because it was relatively hard.

[Stick]

I think i legit failed that exam  :/

can't believe i misread some of the 6 resistors...what study score will i get if i lose 2 marks and get 148/150 in that exam?

Hmm...

[random_person]

Clockwise?

[Spammingb]

can't believe i misread some of the 6 resistors...what study score will i get if i lose 2 marks and get 148/150 in that exam?

If you misread this thread the same way you "misread" the exam, not very high. "Once again, please note that this thread is for examination discussion NOT for study score predictions."

[rany]

For the spring question where you had to explain their error, I know the straightforward answer was about the strain energy being wrong, but I wrote that they didn't take into account energy transformations, they assumed that energy conversions were 100% efficient, also the question said nothing about 'ignore friction forces' so i assumed friction was present (drag forces) so i talked about that.

[silverpixeli]

Okay was the ring at C for the maximums of that flux graph because I'm pretty sure that's right, I'd like to have a discussion about that though, that was the hardest question imo

Also stuffed up the vertical circular motion thing, I knew net force had to be centripetal, but I thought it was a string not a rod so I said there would only be tension and weight making the net force in the direction of E.. god damn it. Anyway that question was borderline out of the study design anyway, aren't we only required to consider vertical circular motion at the top and bottom of a circle?

[joey7]

Clockwise?

I got anticlockwise for the ring haha

[mmlp2]

Clockwise?

yep clockwise!

[silverpixeli]

On the contrary, I am fairly sure it's clockwise for that 4 mark ring question, if you're looking from the top at least.

[Henreezy]

Clockwise imo.

N -----> response <----
therefore clockwise

[monty]

to be honest that exam was very long.. i actually didn't finish it, left like 3 questions out.. and the difficulty might be a little above average also.

oh that ring question: the current was definitely clockwise if you look at it from the top

[casbanjo]

I thought it went through all the way to B. Does it change direction on the way to B from C?

[silverpixeli]

Anyway,

Definitely a longer-than-usual exam, though I did manage to finish with about 20 minutes left, just enough time to check and find a question I had skipped accidentally. There were some very though-provoking questions in the power section. Dunno what detailed studies you guys did but I thought structures was fair.

I got anticlockwise for the ring haha

I thought it went through all the way to B. Does it change direction on the way to B from C?

I think it does change, but I'm fairly sure the question was only about the current as it began to move downward from A (oh god I hope so, four marks!)

As for the direction as it began to move down from A, that meant there was an increase in upward flux in the ring (as it's getting closer to the north pole) meaning delta flux was up
By lenz's law (which I think there was probably a mark for mentioning) that means the induced current will produce a downward flux to oppose the change, and from the right hand grip rule, clockwise current (looking from the top) made this happen.

[joey7]

Anyway,

Definitely a longer-than-usual exam, though I did manage to finish with about 20 minutes left, just enough time to check and find a question I had skipped accidentally. There were some very though-provoking questions in the power section. Dunno what detailed studies you guys did but I thought structures was fair.

I think it does change, but I'm fairly sure the question was only about the current as it began to move downward from A (oh god I hope so, four marks!)

As for the direction as it began to move down from A, that meant there was an increase in upward flux in the ring (as it's getting closer to the north pole) meaning delta flux was up
By lenz's law (which I think there was probably a mark for mentioning) that means the induced current will produce a downward flux to oppose the change, and from the right hand grip rule, clockwise current (looking from the top) made this happen.

The North pole of the magnet was closest to the bottom wasn't it? so moving it down creates a delta flux downards?

[silverpixeli]

The North pole of the magnet was closest to the bottom wasn't it? so moving it down creates a delta flux downards?

I thought north was up the page :s