Physics Predictions/Thoughts (1 Viewer)

[carrotsss]

Sure !

So basically the definition of the ampere is "A constant current magnitude which when flowing in 2 parallel conductors of infinite length, of negligible cross sectional area and placed 1 m apart, would produce a force of 2*10^-7 N/m between these conductors"

Its just linked to newtons third law because the magnitude of the force experienced by both conductors is the same. Thats pretty much it

cheers I remember that now

 

[Trippzy]

Sure !

So basically the definition of the ampere is "A constant current magnitude which when flowing in 2 parallel conductors of infinite length, of negligible cross sectional area and placed 1 m apart, would produce a force of 2*10^-7 N/m between these conductors"

Its just linked to newtons third law because the magnitude of the force experienced by both conductors is the same. Thats pretty much it

wait so the science ready definition is wrong??

 

[CamdenCeccato]

I havent done it was it any good? Is it worth doing?

its a relatively easy exam

 

[SB257426]

wait so the science ready definition is wrong??

this definition is the one science ready gave.

 

[Trippzy]

this definition is the one science ready gave.

ye but that's the old one before 2019

 

[abelsj01]

does anyone recognise this formula: "ε = 2πfnBA"? it's the formula for the max emf in a dc motor but im not sure if we'd need it although i learnt it earlier in the year

 

[CamdenCeccato]

does anyone recognise this formula: "ε = 2πfnBA"? it's the formula for the max emf in a dc motor but im not sure if we'd need it although i learnt it earlier in the year

where did you get this from

 

[abelsj01]

from my teacher earlier in the year

 

[liamkk112]

does anyone recognise this formula: "ε = 2πfnBA"? it's the formula for the max emf in a dc motor but im not sure if we'd need it although i learnt it earlier in the year

uh shouldnt need it

 

[CamdenCeccato]

uh shouldnt need it

unless you need to derive it, say what is the change in flux within a circular conductor or something like that.

 

[abelsj01]

how likely is a short answer ac induction motor question for this yrs paper

 

[Yueyue]

how likely is a short answer ac induction motor question for this yrs paper

99.999999%

 

[A Morgan Freeman]

is anyone else severely underprepared for physics?

 

[SB257426]

ye but that's the old one before 2019

where can i find the new definition he gave

 

[SB257426]

how likely is a short answer ac induction motor question for this yrs paper

pretty likely imo

this paper has bright chances of being hard, given how easy last years was

 

[ms_grape_taco]

is it likely to be hard coz of calculations or coz hard theory?

What are some examples of "hard theory" q's?

 

[carrotsss]

is it likely to be hard coz of calculations or coz hard theory?

What are some examples of "hard theory" q's?

I would say calculations hard given the exams have been quite clearly moving in that direction

Imo theory hard is harder through since most phys maths is pretty simple, whereas theory hard is usually just big mark questions where a super thorough explanation is required which are a lot easier to lose one or two marks on. At least in my class who mostly don’t try at all, most people can do the calculations whereas barely anyone can keep up with all the content knowledge required for those long responses

 

[Trippzy]

where can i find the new definition he gave

in the same vid science ready posted. he says it after saying the old one. the new is something like: a current of one ampere is one coloumb of charge passing through a given point in time

 

[ms_grape_taco]

I would say calculations hard given the exams have been quite clearly moving in that direction

Imo theory hard is harder through since most phys maths is pretty simple, whereas theory hard is usually just big mark questions where a super thorough explanation is required which are a lot easier to lose one or two marks on. At least in my class who mostly don’t try at all, most people can do the calculations whereas barely anyone can keep up with all the content knowledge required for those long responses

yeah that's fair - so similar to chemistry this year? or chem last year?

anyway to get better at calculations?

 

[Trippzy]

I would say calculations hard given the exams have been quite clearly moving in that direction

Imo theory hard is harder through since most phys maths is pretty simple, whereas theory hard is usually just big mark questions where a super thorough explanation is required which are a lot easier to lose one or two marks on. At least in my class who mostly don’t try at all, most people can do the calculations whereas barely anyone can keep up with all the content knowledge required for those long responses

do u reckon there will be an even split between calcs and theory? or will 1 dominate