Login

Search the forums now!

Welcome, Guest. Please login or register.

July 19, 2025, 08:32:01 pm
Pages: 1 [2] 3 4 5   Go Down

Author Topic: Structures and Materials Question  (Read 11402 times)  Share 

0 Members and 1 Guest are viewing this topic.

stephnay

  • West Australian
  • Fresh Poster
  • *
  • Posts: 3
Re: Structures and Materials Question
« Reply #15 on: June 14, 2011, 09:54:52 pm »
Centre of weight to the right of post B, plus the weight of the diver, very to different to past VCAA questions like this. Think about it if structure A wasnt holding it in place, it would rotate clockwise, but when A holds the very end of the left side of the plank, it causes a bending motion upwards, causing tension along the top. There is no physical nor theoretical way that option D could have been correct in my opinion.. though I've made a mistake once before...
Logged

thushan

  • ATAR Notes Lecturer
  • Honorary Moderator
  • ATAR Notes Legend
  • *******
  • Posts: 4959
Re: Structures and Materials Question
« Reply #16 on: June 14, 2011, 10:01:27 pm »
Hey, richard.sw, are you who I think you are? :P
Logged
Managing Director  and Senior Content Developer - Decode Publishing (2020+)
http://www.decodeguides.com.au

Basic Physician Trainee - Monash Health (2019-)
Medical Intern - Alfred Hospital (2018)
MBBS (Hons.) - Monash Uni
BMedSci (Hons.) - Monash Uni

Former ATARNotes Lecturer for Chemistry, Biology

stephnay

  • West Australian
  • Fresh Poster
  • *
  • Posts: 3
Re: Structures and Materials Question
« Reply #17 on: June 14, 2011, 10:20:20 pm »
You know it tush! On a quest to retrieve my 2 marks haha ;)
Logged

thushan

  • ATAR Notes Lecturer
  • Honorary Moderator
  • ATAR Notes Legend
  • *******
  • Posts: 4959
Re: Structures and Materials Question
« Reply #18 on: June 14, 2011, 10:25:00 pm »
ahahah talk to dr bhargava
Logged
Managing Director  and Senior Content Developer - Decode Publishing (2020+)
http://www.decodeguides.com.au

Basic Physician Trainee - Monash Health (2019-)
Medical Intern - Alfred Hospital (2018)
MBBS (Hons.) - Monash Uni
BMedSci (Hons.) - Monash Uni

Former ATARNotes Lecturer for Chemistry, Biology

Thelimz

  • Victorian
  • Forum Regular
  • **
  • Posts: 81
Re: Structures and Materials Question
« Reply #19 on: June 15, 2011, 06:21:58 pm »
the answer is d, just try this experiment right now, but with a piece or paper, and the paper would sag between a and b
Logged
Methods cas 43 --->~47 (2010)
Specialist 39--->~50
English 41--->~40.4
German 38--->~46.7
Chemistry 36--->~40.5
Physics 42--->~44.5       Aggregate 192.8

Thelimz

  • Victorian
  • Forum Regular
  • **
  • Posts: 81
Re: Structures and Materials Question
« Reply #20 on: June 15, 2011, 06:23:51 pm »
it may also depend if it was physically attached to points a and b, but the question states "mounted" which is ambigous.
Logged
Methods cas 43 --->~47 (2010)
Specialist 39--->~50
English 41--->~40.4
German 38--->~46.7
Chemistry 36--->~40.5
Physics 42--->~44.5       Aggregate 192.8

Milkshake

  • Victorian
  • Trendsetter
  • **
  • Posts: 164
Re: Structures and Materials Question
« Reply #21 on: June 15, 2011, 06:36:51 pm »
I put A for my answer.
The way I saw it was:
If we look at support A, if we remove that bottom block of support A, then the setup will still be fine, and the top of AB would be in tension because of A pushing downwards, and B pushing upwards.
If we remove the top block of support A, then the entire beam will just spin clockwise.
Therefore, we need the top block of support A, but the bottom block isn't really required.
So we have the top block of support A, as well as support B - so the top of AB will be in tension.

I dunno, that was my thought process in the exam. Not sure if it makes sense.
Logged

thushan

  • ATAR Notes Lecturer
  • Honorary Moderator
  • ATAR Notes Legend
  • *******
  • Posts: 4959
Re: Structures and Materials Question
« Reply #22 on: June 15, 2011, 06:54:29 pm »
Confirmed. It is A.
Logged
Managing Director  and Senior Content Developer - Decode Publishing (2020+)
http://www.decodeguides.com.au

Basic Physician Trainee - Monash Health (2019-)
Medical Intern - Alfred Hospital (2018)
MBBS (Hons.) - Monash Uni
BMedSci (Hons.) - Monash Uni

Former ATARNotes Lecturer for Chemistry, Biology

cranberry

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 310
Re: Structures and Materials Question
« Reply #23 on: June 15, 2011, 07:35:37 pm »
Quote from: Milkshake on June 15, 2011, 06:36:51 pm
I put A for my answer.
The way I saw it was:
If we look at support A, if we remove that bottom block of support A, then the setup will still be fine, and the top of AB would be in tension because of A pushing downwards, and B pushing upwards.
If we remove the top block of support A, then the entire beam will just spin clockwise.
Therefore, we need the top block of support A, but the bottom block isn't really required.
So we have the top block of support A, as well as support B - so the top of AB will be in tension.

I dunno, that was my thought process in the exam. Not sure if it makes sense.

thankyou
Logged
Master of Civil Engineering and Bachelor of Science at the University of Melbourne

VCE:
2010: Revolutions [36]
2011: English 45, Legal Studies 38, Physics 37, Chemistry 34, Methods 36

94.85

HCbigstick

  • Victorian
  • Trailblazer
  • *
  • Posts: 46
Re: Structures and Materials Question
« Reply #24 on: June 16, 2011, 06:12:05 pm »
Just a question guys, why would a diving board be made out of reinforced concrete?
Logged

Romperait

  • Victorian
  • Forum Leader
  • ****
  • Posts: 511
  • School Grad Year: 2011
Re: Structures and Materials Question
« Reply #25 on: June 16, 2011, 06:24:44 pm »
Quote from: HCbigstick on June 16, 2011, 06:12:05 pm
Just a question guys, why would a diving board be made out of reinforced concrete?

So that it's supah strong!
Logged

HCbigstick

  • Victorian
  • Trailblazer
  • *
  • Posts: 46
Re: Structures and Materials Question
« Reply #26 on: June 16, 2011, 06:41:33 pm »
Quote from: Romperait on June 16, 2011, 06:24:44 pm
Quote from: HCbigstick on June 16, 2011, 06:12:05 pm
Just a question guys, why would a diving board be made out of reinforced concrete?

So that it's supah strong!

Fair enough.
Logged

Thelimz

  • Victorian
  • Forum Regular
  • **
  • Posts: 81
Re: Structures and Materials Question
« Reply #27 on: June 17, 2011, 06:18:59 pm »
confirmed answer is d
Logged
Methods cas 43 --->~47 (2010)
Specialist 39--->~50
English 41--->~40.4
German 38--->~46.7
Chemistry 36--->~40.5
Physics 42--->~44.5       Aggregate 192.8

thushan

  • ATAR Notes Lecturer
  • Honorary Moderator
  • ATAR Notes Legend
  • *******
  • Posts: 4959
Re: Structures and Materials Question
« Reply #28 on: June 17, 2011, 07:57:51 pm »
Kidding? Personally I put D, but I think in hindsight it is A. How did you confirm it's D?
Logged
Managing Director  and Senior Content Developer - Decode Publishing (2020+)
http://www.decodeguides.com.au

Basic Physician Trainee - Monash Health (2019-)
Medical Intern - Alfred Hospital (2018)
MBBS (Hons.) - Monash Uni
BMedSci (Hons.) - Monash Uni

Former ATARNotes Lecturer for Chemistry, Biology

pi

  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 14348
  • Doctor.
Re: Structures and Materials Question
« Reply #29 on: June 17, 2011, 09:05:37 pm »
I did cantilevers as my physics project SAC EPI. The top part is definitely all under tension. We saw the part between the blocks clearly bend with the top in tension during our prac.


Quote from: HCbigstick on June 16, 2011, 06:12:05 pm
Just a question guys, why would a diving board be made out of reinforced concrete?

Why would you have a 300kg cyclist going at 15 m/s at a fairly steep incline?

Answer: Its physics, anything is supposed to be possible
« Last Edit: June 17, 2011, 09:18:16 pm by Rohitpi »
Logged
Pages: 1 [2] 3 4 5   Go Up