Physics Predictions/Thoughts (1 Viewer)

[Rattlehead15]

For people who do physics, definitely including @scaryshark09 , do we need to know equation examples of alpha, beta and gamma decay off by heart? Can they ask us to give an example??

 

[scaryshark09]

For people who do physics, definitely including @scaryshark09 , do we need to know equation examples of alpha, beta and gamma decay off by heart? Can they ask us to give an example??

i would say it is best to learn these equations off by heart.
they can ask to give an example

 

[Rattlehead15]

i would say it is best to learn these equations off by heart.
they can ask to give an example

Thank you for your current physics student insight. Unironically, I will be memorising a couple now

 

[scaryshark09]

Thank you for your current physics student insight. Unironically, I will be memorising a couple now

lol i actually still did physics when i learnt this
these generic equations are something you should know

 

[ExtremelyBoredUser]

Thank you for your current physics student insight. Unironically, I will be memorising a couple now

its good to go a bit beyond the syllabus and do your own research into the topics, having extensive knowledge wont only help u for short answers but more importantly long answer qs.

 

[Rattlehead15]

lol i actually still did physics when i learnt this
these generic equations are something you should know
View attachment 41198

Yeah but what about actual like real world examples like uranium something -----> uranium something else

 

[Rattlehead15]

its good to go a bit beyond the syllabus and do your own research into the topics, having extensive knowledge wont only help u for short answers but more importantly long answer qs.

Anything to get a band 6 in this subject I want to finish the hsc on a high note so bad.

 

[ExtremelyBoredUser]

Anything to get a band 6 in this subject I want to finish the hsc on a high note so bad.

tbh shouldnt be too hard, just know what to write and practice a lot before the paper so u familiarise with the structure and type of qs.

 

[CamdenCeccato]

If anyone's done the parramatta hs trial 2023 lmk your mark, I got 75/100, screwed up the last question but feel pretty good about that mark

74/100 but got 11/20 on multiple choice

 

[skp_mp4]

How much yall reckon is gonna be good enough for a band 5 gonna be this year

 

[scaryshark09]

How much yall reckon is gonna be good enough for a band 5 gonna be this year

95 would definitely be at least a band 5

 

[carrotsss]

How much yall reckon is gonna be good enough for a band 5 gonna be this year

Depends on how hard the paper is which is pretty unpredictable atp

 

[skp_mp4]

95 would definitely be at least a band 5

I think for band 6 you actually have to write your own question in the spare page section and get it right to get over 100%

 

[salihaaaameeer]

HELP PLEASE!






Does anyone know how to solve these questions? They're from the 2023 parramatta high school trial paper
Below are their answers:










10: B
13: A
14: B

 

[Aaryan123]

HELP PLEASE!
View attachment 41236

View attachment 41233
View attachment 41234
View attachment 41235

Does anyone know how to solve these questions? They're from the 2023 parramatta high school trial paper
Below are their answers:










10: B
13: A
14: B

for q10, you want to find a general formula for the range of a projectile. range occurs when the y displacement =0.
so from s=ut+1/2at^2, you let s=0. you also know that you can divide by t, because that is at the origin, we're looking for the t when it hits the ground again.
therefore, 0=usintheta+(1/2)(-9.8)t
hence t=2usintheta/9.8
now the range is the horizontal component multiplied by time travelled
so Range = Utcostheta
= 2U^2sinthetacostheta/9.8
= (u^2)sin2theta/9.8
now sub in all values given in options, and B should be the largest.

13. Use kepler's 3rd law, and remember that the r value that you find is the radius of the earth plus the altitude.
14. Remember that during uniform circular motion, the value of the centripetal accel is v^2/r. both v^2 and r are constant in this example, so accel is also constant hence B

 

[CamdenCeccato]

HELP PLEASE!
View attachment 41236

View attachment 41233
View attachment 41234
View attachment 41235

Does anyone know how to solve these questions? They're from the 2023 parramatta high school trial paper
Below are their answers:










10: B
13: A
14: B

There might be an easier way to do 10 but you calculate the time of flight for all the launches then find the range for all the launches.

i got d for 13 so I can’t help you with that one.
Don’t over complicate 14.

 

[salihaaaameeer]

There might be an easier way to do 10 but you calculate the time of flight for all the launches then find the range for all the launches.

i got d for 13 so I can’t help you with that one.
Don’t over complicate 14.

for q10, you want to find a general formula for the range of a projectile. range occurs when the y displacement =0.
so from s=ut+1/2at^2, you let s=0. you also know that you can divide by t, because that is at the origin, we're looking for the t when it hits the ground again.
therefore, 0=usintheta+(1/2)(-9.8)t
hence t=2usintheta/9.8
now the range is the horizontal component multiplied by time travelled
so Range = Utcostheta
= 2U^2sinthetacostheta/9.8
= (u^2)sin2theta/9.8
now sub in all values given in options, and B should be the largest.

13. Use kepler's 3rd law, and remember that the r value that you find is the radius of the earth plus the altitude.
14. Remember that during uniform circular motion, the value of the centripetal accel is v^2/r. both v^2 and r are constant in this example, so accel is also constant hence B

thank you for this !

 

[salihaaaameeer]

There might be an easier way to do 10 but you calculate the time of flight for all the launches then find the range for all the launches.

i got d for 13 so I can’t help you with that one.
Don’t over complicate 14.

you have to minus the radius of earth (6371km) from 6759.8, so 6759-6371km = 388.8 km and that's the answer

 

[esybeast]

Can someone explain why the answer is D and not C? (question from PHS)

 

[CamdenCeccato]

View attachment 41243
Can someone explain why the answer is D and not C? (question from PHS)

Because E = mc^2 Energy is released as the smaller components always have more mass than the final larger product.