# HSC Physics Predictions / Thoughts (1 Viewer)

#### Luke322

##### Well-Known Member
Yeah you used Grav force then just K = 1/2 m v^2 or something like that. Can’t remember specifically but there was hypothetically a second scenario where the planets are infinitely far away from one another and their speed cannot be determined. Not sure if that’ll be in the question though
oh thank god

#### Luke322

##### Well-Known Member
I'm aiming for a 90 raw and I'm pretty sure I lost like 4 marks in multi's lol they were pretty hard (the last ones at least)

#### Luke322

##### Well-Known Member
also what last minute stuff are u doing for chem?

#### Speed’o’sound Sonic

##### Well-Known Member
also what last minute stuff are u doing for chem?
At this stage in the game just looking at sample questions and last year’s paper. They’ll give the most accurate estimate of what’s coming up on Mondat

#### Esdog07

##### New Member
Q20 I put A in the exam
Here is my reasoning and my teacher's reasoning

The ball is projected at angle to horizontal and with speed u ms^-1. So it undergoes projectile motion. However it was projected against a circular wall. So it will also undergo circular motion. If you look at the image from the top you will see it undergo circular motion. If you look at the ball from in front of the wall, you will see it undergo projectile motion. So there is a force of gravity acting down on the ball, while there is a centripetal force acting on the ball that is perpendicular to the surface of the wall. We know that the centripetal force is dependent on the tangential velocity of the ball (which is the horizontal velocity of its projectile motion). The force of gravity is not dependent on the velocity of the ball, but it affects the vertical velocity of the projectile motion. So the horizontal velocity (tangential velocity) remains constant. So the centripetal force remains constant. We know that if a centripetal force acts perpendicular to the wall, and the gravitational force acts downwards, then centripetal force and gravitational force are always perpendicular. Hence the magnitude of the net force on the ball is constant.

PS. I also started to think about friction on the ball against the wall in the exam, but that made the thinking too complicated I reckon

#### Luke322

##### Well-Known Member
what did you put for q19 (emf q) and 15 (trajectory one)

#### Speed’o’sound Sonic

##### Well-Known Member
what did you put for q19 (emf q) and 15 (trajectory one)
Q19 was A, the sine curve. Q15 was parabolically upwards

#### Luke322

##### Well-Known Member
Q19 was A, the sine curve. Q15 was parabolically upwards
RIP me lol 3-4 multi's wrong

#### Speed’o’sound Sonic

##### Well-Known Member
RIP me lol 3-4 multi's wrong
Won’t matter too much if you had strong extended responses. Oh well no point dwelling over it now. Chem study time

#### Luke322

##### Well-Known Member
Won’t matter too much if you had strong extended responses. Oh well no point dwelling over it now. Chem study time
true haha can't wait for a 9 mark Aboriginal question

#### Speed’o’sound Sonic

##### Well-Known Member
true haha can't wait for a 9 mark Aboriginal question
leeching of toxins from Cycad seeds here we goo

#### homeworkatedog

##### Member
For the motor pulling a mass I talked about factors influencing torque on the pulley (current, magnetic field strength, area and number of armature coils, etc

For the motor pulling a mass I talked about factors influencing torque on the pulley (current, magnetic field strength, area and number of armature coils, etc, and distance between rotor and pulley edge, as well as factors influencing friction on the mass I.e coefficient of friction and weight of the mass. For the standard model question I talked about how proton is a hadron + Baryon and how the electron is a lepton and examined the force carriers and their effects on the H atom.
how about back emf? could that be a point

#### Luke322

##### Well-Known Member
leeching of toxins from Cycad seeds here we goo

#### Luke322

##### Well-Known Member
how about back emf? could that be a point
yeah i said that as well

#### homeworkatedog

##### Member
leeching of toxins from Cycad seeds here we goo
i did chem last year and that GODDAM QUESTION turned up in the trials, the final exam, everything, know it well dude

#### Speed’o’sound Sonic

##### Well-Known Member
how about back emf? could that be a point
Sure could be! I honest had so much to write about I ran out of room I mainly stuck with the essentials and a good in-depth explanation of net force linked to speed

#### Speed’o’sound Sonic

##### Well-Known Member
i did chem last year and that GODDAM QUESTION turned up in the trials, the final exam, everything, know it well dude
Legit it’s in everything that an a 6 marker on action of soaps

#### Luke322

##### Well-Known Member
Sure could be! I honest had so much to write about I ran out of room I mainly stuck with the essentials and a good in-depth explanation of net force linked to speed
my god so true I wrote like 4 pages for the 9 marker on bloody calculating energies and velocities

#### Luke322

##### Well-Known Member
Legit it’s in everything that an a 6 marker on action of soaps
the equilibrium shifts right right?