• Congratulations to the Class of 2024 on your results!
    Let us know how you went here
    Got a question about your uni preferences? Ask us here

HSC Physics Marathon 2013-2015 Archive (3 Viewers)

Status
Not open for further replies.

Parvee

(╯°□°)╯︵ ┻━┻
Joined
Apr 4, 2011
Messages
1,077
Gender
Female
HSC
2012
re: HSC Physics Marathon Archive

Question:

Bob bought a new drill. He attempts to drill through concrete, but as the concrete is hard, the drill slows right down. However Chris holds the trigger, waiting for it to drill though.

Explain why Chris is an idiot. (3 marks).
i wonder if this is aimed at a certain someone :lol:
 

skillstriker

Member
Joined
Jan 19, 2012
Messages
115
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

the back emf is reduced because the coil is rotating slower (smaller rate of change of flux thus less emf induced as per Faraday) thus the supply current is almost unopposed which can burn the motor
 

iBibah

Well-Known Member
Joined
Jun 13, 2012
Messages
1,374
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

i wonder if this is aimed at a certain someone :lol:
lol forgot to change the bob at the start

the back emf is reduced because the coil is rotating slower (smaller rate of change of flux thus less emf induced as per Faraday) thus the supply current is almost unopposed which can burn the motor
Essentially, yes
 

Fizzy_Cyst

Owner @ Sigma Science + Phys Goat
Joined
Jan 14, 2011
Messages
1,212
Location
Parramatta, NSW
Gender
Male
HSC
2001
Uni Grad
2005
re: HSC Physics Marathon Archive

Explain why Chris is an idiot. (3 marks).
:vcross:

Dont talk about Siddy like that! :devil:

Question: (3 marks)

A proton is fired into an Electric Field at a speed of 2.8x10^8ms-1. The field is provided by a pair of parallel plates with a potential difference of 1kV, separated by 1cm. The electric field is running up the page.

Determine the acceleration of the proton
 

Menomaths

Exaı̸̸̸̸̸̸̸̸lted Member
Joined
Jul 9, 2013
Messages
2,373
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

:vcross:

Dont talk about Siddy like that! :devil:

Question: (3 marks)

A proton is fired into an Electric Field at a speed of 2.8x10^8ms-1. The field is provided by a pair of parallel plates with a potential difference of 1kV, separated by 1cm. The electric field is running up the page.

Determine the acceleration of the proton
9.576x10^12 m/s^2 upwards?
 
Last edited:

Menomaths

Exaı̸̸̸̸̸̸̸̸lted Member
Joined
Jul 9, 2013
Messages
2,373
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

Damn :(
 

superSAIyan2

Member
Joined
Apr 18, 2012
Messages
320
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

im not 100% certain my answer is right though. Did you account for mass dilation?
 

Menomaths

Exaı̸̸̸̸̸̸̸̸lted Member
Joined
Jul 9, 2013
Messages
2,373
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

Nah I didn't...Seems like your answer is correct though
 

Fizzy_Cyst

Owner @ Sigma Science + Phys Goat
Joined
Jan 14, 2011
Messages
1,212
Location
Parramatta, NSW
Gender
Male
HSC
2001
Uni Grad
2005
re: HSC Physics Marathon Archive

Well done SuperSaiyan!

I was wondering to see how long it would take for someone to account for mass dilation! NOT TOO LONG AT ALL :D
 

Fizzy_Cyst

Owner @ Sigma Science + Phys Goat
Joined
Jan 14, 2011
Messages
1,212
Location
Parramatta, NSW
Gender
Male
HSC
2001
Uni Grad
2005
re: HSC Physics Marathon Archive

Outline how doping causes holes to be generated in a p-type semiconductor and clarify how they act as charge carriers. USE EITHER THE TERM ACCEPTOR LEVEL OR DONOR LEVEL IN YOUR ANSWER AND PROVIDE AN APPROPRIATE DIAGRAM (3 MARKS)
 

Fizzy_Cyst

Owner @ Sigma Science + Phys Goat
Joined
Jan 14, 2011
Messages
1,212
Location
Parramatta, NSW
Gender
Male
HSC
2001
Uni Grad
2005
re: HSC Physics Marathon Archive

ANYONE FOR A HARD MATHS QUESTION?!?!

A sniper is lying in a prone position such that the barrel of his rifle is 30cm above the ground. The muzzle velocity of his rifle is 800ms-1.

A target appears at a distance of 1250m with the centre of the target 1.2m above the ground level. If the sniper was firing from the prone position, calculate the angle to which the barrel of the rifle should be raised to hit the centre of the target (disregard any elevation of the rifle due to the angle)

(Just for you iBibah) ;)
 

superSAIyan2

Member
Joined
Apr 18, 2012
Messages
320
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

lol i got 0degrees and 35minutes and 89degrees 27minutes
 

Fizzy_Cyst

Owner @ Sigma Science + Phys Goat
Joined
Jan 14, 2011
Messages
1,212
Location
Parramatta, NSW
Gender
Male
HSC
2001
Uni Grad
2005
re: HSC Physics Marathon Archive

(GIVE THEM TIME SUPERSAIYAN!!)

?HARD? CONCEPTUAL MATHS QUESTION


A projectile is launched from the surface of planet habibi (pronounced kkkkkkkkhabeebee), at t = 3s and t = 14s, the vertical displacement is 60m.

Determine the acceleration due to gravity on habibi and the maximum height of the projectile

ONLY USE PHYSICS EQUATIONS!!!!

YALLA!
 
Last edited:

Menomaths

Exaı̸̸̸̸̸̸̸̸lted Member
Joined
Jul 9, 2013
Messages
2,373
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

Hahahahahhahaha
 

superSAIyan2

Member
Joined
Apr 18, 2012
Messages
320
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

i wont post my working yet. But is the answer: acceleration is -4.8m/s/s and max height 173.4m
 

Menomaths

Exaı̸̸̸̸̸̸̸̸lted Member
Joined
Jul 9, 2013
Messages
2,373
Gender
Male
HSC
2013
re: HSC Physics Marathon Archive

Inb4 Supersaiyan banned from Physics marathon :p
 
Status
Not open for further replies.

Users Who Are Viewing This Thread (Users: 0, Guests: 3)

Top