Physics Exam Thoughts (1 Viewer)

pikachu975

For the maglev train superconductors one what'd people write

New Member
For the maglev train superconductors one what'd people write
I said superconductors are used in them for electricity distribution to power electromagnets.

* No power requirement except for cooling

* High current capability

Member
i wrote it could carry large currents cause no resistance below critical temp and it is cheaper to run than conventional electromagnets cause no resistance meant not as much energy loss due to heat maybe that's the same point tho

camstu

New Member
Idk if it will let me say the site name on this without getting banned. It's just in hsc exam discussion 2017 for another site if you look for it you'll find it
found it thanks, according to that I got 17/20 in MC, not great but seems everyone had their problems in it so its ok i guess

New Member
i wrote it could carry large currents cause no resistance below critical temp and it is cheaper to run than conventional electromagnets cause no resistance meant not as much energy loss due to heat maybe that's the same point tho
They don't use the meissner effect to levitate the train

Member
Yeah i didn't say that in my answer. But to levitate it, don't they use repulsion by using the same pole on the train and on the tracks?

ChasingMedForLife

New Member
Yeah i didn't say that in my answer. But to levitate it, don't they use repulsion by using the same pole on the train and on the tracks?
yeah with rapidly changing electromagnets.

like positive pole on the train, positive behind the train (repulsion) then negative infront (attraction) to make it efficient

Qw0pper0

New Member
Overall velocity was 10, so Ux was 10Cos60 which was about 8.66
Doesn't Cos60 = 1/2 so it was 5m/s?

janzrn

New Member
The radiation question was bs had no clue what I was writing
Proton I half bsed it but hopefully my north west helical shape was right

To the person above, range was found using delta y = 0, finding t and subbing back into delta x.
Pre sure from the top, the proton is moving in a parabola instead of north west

pikachu975

Doesn't Cos60 = 1/2 so it was 5m/s?
They meant final answer was 8.66

EngineeringHelp

New Member
Anyone else do Medical Physics?

New Member
Anyone else do Medical Physics?
Yeah i thought it was pretty good actually

Asylum99

New Member
Anyone know what the band 5 cut off will be? Asking for a friend

EngineeringHelp

New Member
Yeah i thought it was pretty good actually
Why are different frequencies used for Sector (3.5MHz) and B (20MHz) scans?

Also, the polarity of P and Q? I got P as positive and Q as negative? Correct or nah?

pikachu975

Why are different frequencies used for Sector (3.5MHz) and B (20MHz) scans?

Also, the polarity of P and Q? I got P as positive and Q as negative? Correct or nah?
I put that too but P is negative turns out since it said "circuit" hence positive charges come out of the positive terminal. If it was just a wire it'd be P but nah

fluffchuck

Active Member
Why are different frequencies used for Sector (3.5MHz) and B (20MHz) scans?

Also, the polarity of P and Q? I got P as positive and Q as negative? Correct or nah?
I don't completely remember what P and Q were, but the current travels in a clockwise direction.

pikachu975

I don't completely remember what P and Q were, but the current travels in a clockwise direction.
Yeah I thought it was a normal wire so positive charges build up at P but guess it's a circuit so positive charges go to negative (P).