** HL Physics Before / after **

Chikablam

no scope codgod wrote: »

Pressure of a gas at a fixed volume.
Volume of a gas at fixed pressure.
Length of a liquid column.
Resistance of a thermistor.

Derive Kepler's 3rd Law.

Kepler's not on it........right......?

Leaving Cert Student

Chikablam wrote: »

Kepler's not on it........right......?

to derive it you equate centripetal force and universal gravitation formulae... you derive keplers from this not bothered doing it out on this though

MarieCurie22

Predictions?????

Chikablam

Leaving Cert Student wrote: »

to derive it you equate centripetal force and universal gravitation formulae... you derive keplers from this not bothered doing it out on this though

Ah right that thing, yeah I know how to do that, just didn't realise it had a specific name

Undeadfred

I heard Quantum Field Theory is coming up

Leaving Cert Student

Undeadfred wrote: »

I heard Quantum Field Theory is coming up

The **** is that

D_s

Leaving Cert Student wrote: »

The ampere is that current which, if maintained in two infinitely long parallel wires of negligible cross-sectional area 1m apart in a vacuum, experiences a force of 2x10^7 newtons per metre length.

2x10^-7, damnit! :P

Sorry, my pedanticism kicks in when I'm studying Physics

optimus125

D_s wrote: »

2x10^-7, damnit! :P

Sorry, my pedanticism kicks in when I'm studying Physics

Pedanticism is kind of necessary when studying physics!

Undeadfred

Did anyone do that Mock paper which had the question in the mechanics section 'why does the spaceship not orbit at this height?'
It was referring to geostationary orbit around the moon

Neither I nor my Physics teacher knew the answer and we didn't have the marking scheme

Leaving Cert Student

Undeadfred wrote: »

Did anyone do that Mock paper which had the question in the mechanics section 'why does the spaceship not orbit at this height?'


I like cheese and it was referring to geostationary orbit around the moon

Neither I nor my Physics teacher knew the answer and we didn't have the marking scheme

I think I saw it alright, I answered that this height was too expensive or something but what is this reasoning behing geostationary orbit? sounds more sensical.

no scope codgod

Undeadfred wrote: »

Did anyone do that Mock paper which had the question in the mechanics section 'why does the spaceship not orbit at this height?'
It was referring to geostationary orbit around the moon

Neither I nor my Physics teacher knew the answer and we didn't have the marking scheme

"The height required for geostationary orbit around the moon is so high that the gravitational force from the Earth would likely have been stronger and so would have interfered with the orbit." Was my answer in the mocks and my teacher gave me the marks. The actual marking scheme was:

1) Too far for the lunar module to travel
2) Large amount of fuel needed
3) Geostationary orbit can only be above a planet's "equator"

** Accept any valid reason.

dorcan

Does anyone think i am mad for not learning a bit about electricity

decisions

dorcan wrote: »

Does anyone think i am mad for not learning a bit about electricity

Yep, but only the experiments and Q5 definitions and little calculations.

dorcan

decisions wrote: »

Yep, but only the experiments and Q5 definitions and little calculations.

I do know all the basics how to use the formulas and the likes. The experiments was hoping they wouldnt put two electricity question up. Could they?

Closet Monkey

2 Electricity experiments is unlikely to come up. I think an experiment of light wave and maybe sound will come up.

dorcan

Advice for everybody learn eletromagnetic induction well, hasnt come up as a full question since 2009. Any other suggestions.

D_s

dorcan wrote: »

Any other suggestions.

Our Physics teacher gave us his "Chancers guide to LC Physics" on our last day with his predictions.

Experiments: 
g by Freefall
Speed of Sound
Specific Heat Capacity
Joule's Law

Section B:
Equations of Motion, collisions, newtons laws
Wave nature of light, optics, doppler effect
Electric Field Strength, V vs I curves, Domestic Cicuits
Rutherford gold foil exp., Radioactivity (Half life etc.), Cathode Ray tube/X-Ray tube

dorcan

D_s wrote: »

Our Physics teacher gave us his "Chancers guide to LC Physics" on our last day with his predictions.

Experiments: 
g by Freefall
Speed of Sound
Specific Heat Capacity
Joule's Law

Section B:
Equations of Motion, collisions, newtons laws
Wave nature of light, optics, doppler effect
Electric Field Strength, V vs I curves, Domestic Cicuits
Rutherford gold foil exp., Radioactivity (Half life etc.), Cathode Ray tube/X-Ray tube

Honestly think none of this will come up. Domestic circuits will never appear on a higher level paper. There is too many ligth questions in his predictions. And i cant se them putting all those mechanics questions on the paper itcwould be handy marks even for a student whose is unless at the subject

YoursSincerely

My teacher was thinking the resistivity of nicrome wire is going to come up, and that is certainly one of the nicer electricity, since both mocks had full questions on simple harmonic motion and circular motion that will probably make an appearance.

MarieCurie22

dorcan wrote: »

Honestly think none of this will come up. Domestic circuits will never appear on a higher level paper. There is too many ligth questions in his predictions. And i cant se them putting all those mechanics questions on the paper itcwould be handy marks even for a student whose is unless at the subject

Dude Im pretty sure theyre suggestions for one question on each line....i think the mechanics is spot on if you look at papers! Also derive F=Ma

Newtons laws always come up so :P Bit of respect for the lad.

MarieCurie22

YoursSincerely wrote: »

My teacher was thinking the resistivity of nicrome wire is going to come up, and that is certainly one of the nicer electricity, since both mocks had full questions on simple harmonic motion and circular motion that will probably make an appearance.

No circular motion was on last years paper in q12 and in 2011/2010 uvast equations and forces havent been seen since 08/09 SHM was in 2011/2010 also so id say not! Just because it came up in the pree :P

MarieCurie22

dorcan wrote: »

Advice for everybody learn eletromagnetic induction well, hasnt come up as a full question since 2009. Any other suggestions.

For the mechanics experiment Id put my money on co-planar forces more so than g by free fall. But know those 2...Defo learn the heat experiments and Id say speed of sound in air....

Leaving Cert Student

Is anyone doing extra q's? all 4 experiments? 3 q12's? an extra 56 marker?

MarieCurie22

Leaving Cert Student wrote: »

Is anyone doing extra q's? all 4 experiments? 3 q12's? an extra 56 marker?

Ill defo do another experiment q for sure as for 56 marker ill try if i have time...they say always do q5 and q12 cause of the options!

no scope codgod

Leaving Cert Student wrote: »

Is anyone doing extra q's? all 4 experiments? 3 q12's? an extra 56 marker?

I'll probably do 3 from Question 12 and probably an extra 56 marker, but not an extra experiment.

Leaving Cert Student

Hmm... do you think timewise the exam allows for an extra 56 marker? Some can be a lot quicker than others

ynwa14

I always have time left in the exam but I'm not gonna do an extra experiment question unless I actually know all four because I do find them harder (I know only person who feels that way) and always do better in section B? I'd rather spend my time on maybe doing all of Q12 or an extra question.

ALSO what derivations would be likely? I was thinking Keplers but thats just a niggling feeling

no scope codgod

Some of the questions are ridiculously short, especially the Particle Physics questions. You could easily pick up time there.

Leaving Cert Student

Does a vernier calipers measure diameter?

lisheen2308

here's a question from our pre which i think is nice:
The manager of a department store wants to purchase mirrors for the dressing room. To reduce costs, she wants to purchase mirrors that are short as possible but will allow a person of height 2m to see themselves standing full length in the mirror.
What is the shortest mirror she should purchase? justify your answer.

Anyone doing the applied electricity option, apparently not many schools do it?