HSC Physics Question Thread

[winstondarmawan]

How would you answer a question that asks for the:
Environmental impacts of transistors. (5)
Impact of transistors on communications. (6)
Struggling to find enough content for 5 and 6 marks. TIA!

EDIT: Do the sample answers on the BOSTES solutions get full marks?

[blasonduo]

How would you answer a question that asks for the:
Environmental impacts of transistors. (5)
Impact of transistors on communications. (6)
Struggling to find enough content for 5 and 6 marks. TIA!

EDIT: Do the sample answers on the BOSTES solutions get full marks?

These Assess questions for transistor are almost identical for assess questions for generators

1) Communication has been improved, (eg mobile phones)
2) Improved imaging techniques for medical
3) However, an over reliance occurs, which leads to diseases such as obesity
4) A loss of jobs due to automation, but also allowed new unique jobs as well
5) Silicon has to be extracted from earth's crust
6) transistors are in computers, which then can overall, monitor the environment and any changes that occur

The list is endless

Also. the sample answers CAN be, but most of the time, no. They are not band 6 answers

[left right gn]

For projectile motion questions, when subbing in values, does 'a' always have to be -9.8

[kiwiberry]

For projectile motion questions, when subbing in values, does 'a' always have to be -9.8

Yes! \(a_y \) will always be -9.8 because the only force acting on a particle in projectile motion is gravity

[Shadowxo]

For projectile motion questions, when subbing in values, does 'a' always have to be -9.8

What kiwiberry said is right but it also depends what direction you're taking to be positive. The (vertical) acceleration will always be -9.8 if you're taking "up" as being positive, but you could also  say "down" is positive in which case a would be +9.8. Normally you'd say acceleration is -9.8 and take up as positive, just thought I'd mention it as some solutions may use down as positive

[johnk21]

For projectile motion questions, when subbing in values, does 'a' always have to be -9.8

Wanna also add that SOME but not ALL projectile motions are not on earth. BUT if it is on another planet, they will provide the acceleration due to gravity for that planet, and so a will equal what they gave you. But always remember to put in a NEGATIVE sign, assuming that you are setting up as positive.

[winstondarmawan]

Hey, would appreciate help with part d). No idea how to do angular velocity
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20706627_1294328377359349_1149916873_n.png?oh=f2b6d4822245ea51975179b4bbea719d&oe=598C13B5
TIA

[austv99]

Hi!
Could someone help with these questions? The formula is missing for part f but need help for part g and h as well

[sidzeman]

pls halp

[blasonduo]

pls halp

Hello! The answer is D

Looking at A, if one had 3 times the amount of coils, one graph should be 3 times the amplitude of the other, which is not the case

For B, It is similar to A where the strength of the magnetic field of twice should be twice the size

For C, It makes no sense how a ferrite core would flip the graphs

So it's D, the rotation results in a faster frequency with a higher amplitude

Hope this helps

[blasonduo]

Hey, would appreciate help with part d). No idea how to do angular velocity
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20706627_1294328377359349_1149916873_n.png?oh=f2b6d4822245ea51975179b4bbea719d&oe=598C13B5
TIA

I can't help you as much as there are no numbers for me to calculate! HOWEVER, this is the first time I've seen this certain question in HSC physics and I doubt  this will be assessed,

These are the formulas I found regarding angular velocity:

[jamonwindeyer]

Hey, would appreciate help with part d). No idea how to do angular velocity
https://scontent-syd2-1.xx.fbcdn.net/v/t34.0-12/20706627_1294328377359349_1149916873_n.png?oh=f2b6d4822245ea51975179b4bbea719d&oe=598C13B5
TIA

I can't help you as much as there are no numbers for me to calculate! HOWEVER, this is the first time I've seen this certain question in HSC physics and I doubt  this will be assessed,

These are the formulas I found regarding angular velocity:

Just confirming angular velocity is definitely not HSC assessable

[jamonwindeyer]

Hi!
Could someone help with these questions? The formula is missing for part f but need help for part g and h as well

Hey! My best guess for this would be that you'd take the relative velocity from Part F, and use this velocity as \(v\) in the regular formulas we use for these sorts of questions in the subsequent part! For Part (g), recalculate the relative velocity then use that in the length contraction formula, I believe! feel free to post a solution if you want us to check it out? Just can't do much without the formula is all

[sidzeman]

I tried subbing the values into .5mv^2 but nothing worked out

[sidzeman]

Completely lost as to this question - thought the answer was C but apparently it's D - why?


I'm not quite sure how to apply the RHP/RHG rule to this