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Simon Crook
เข้าร่วมเมื่อ 4 ส.ค. 2014
Q34 - HSC Physics Exam 2023 & Orbital Transfers, by Dr Simon Crook, CrookED Science
Detailed advice on how to use Q34 as a learning opportunity, aspects to avoid and the advanced theory behind orbital transfers.
Thanks to Dave Hughes, Paul Looyen, Geraint Lewis and many more for your collegial conversations and reflections on this question and the solutions.
NESA ACCREDITED Professional Learning on this and much, much more continually available at crookedscience.com/courses/.
References
"Ellipse - Wikipedia." en.wikipedia.org/wiki/Ellipse. Accessed 13 Dec. 2023.
"Hohmann Transfer Calculator." 6 Nov. 2023, www.omnicalculator.com/physics/hohmann-transfer. Accessed 13 Dec. 2023.
"Hohmann transfer orbit - Wikipedia." en.wikipedia.org/wiki/Hohmann_transfer_orbit. Accessed 13 Dec. 2023.
"Orbits and energy - Physics." 15 May. 2018, physics.bu.edu/~duffy/HTML5/gravitation_orbits_energy.html. Accessed 13 Dec. 2023.
"Physics 2023 HSC exam pack - NSW Education Standards Authority." educationstandards.nsw.edu.au/wps/portal/nesa/resource-finder/hsc-exam-papers/2023/physics-2023-hsc- exam-pack. Accessed 13 Dec. 2023.
"The answers to the HSC Physics exam Short answer section - Physics High". th-cam.com/video/k_Uq3dvUV_w/w-d-xo.html. Accessed 13 Dec. 2023.
Thanks to Dave Hughes, Paul Looyen, Geraint Lewis and many more for your collegial conversations and reflections on this question and the solutions.
NESA ACCREDITED Professional Learning on this and much, much more continually available at crookedscience.com/courses/.
References
"Ellipse - Wikipedia." en.wikipedia.org/wiki/Ellipse. Accessed 13 Dec. 2023.
"Hohmann Transfer Calculator." 6 Nov. 2023, www.omnicalculator.com/physics/hohmann-transfer. Accessed 13 Dec. 2023.
"Hohmann transfer orbit - Wikipedia." en.wikipedia.org/wiki/Hohmann_transfer_orbit. Accessed 13 Dec. 2023.
"Orbits and energy - Physics." 15 May. 2018, physics.bu.edu/~duffy/HTML5/gravitation_orbits_energy.html. Accessed 13 Dec. 2023.
"Physics 2023 HSC exam pack - NSW Education Standards Authority." educationstandards.nsw.edu.au/wps/portal/nesa/resource-finder/hsc-exam-papers/2023/physics-2023-hsc- exam-pack. Accessed 13 Dec. 2023.
"The answers to the HSC Physics exam Short answer section - Physics High". th-cam.com/video/k_Uq3dvUV_w/w-d-xo.html. Accessed 13 Dec. 2023.
มุมมอง: 453
วีดีโอ
USyd School of Education & Social Work Graduation Occasional Address by Dr Simon Crook, 2nd May 2023
มุมมอง 157ปีที่แล้ว
I was humbled to be asked to give the Occasional Address at the graduation of postgraduate and undergraduate students from the School of Education & Social Work at The University of Sydney
Motivational Video for Young Scientist 2020 - Dr Simon Crook
มุมมอง 933 ปีที่แล้ว
A motivational video for students for the 2020 Young Scientist Awards Night which was online due to COVID-19 STANSW Young Scientist - www.youngscientist.com.au/
The Importance of Maxwell Equations
มุมมอง 11K4 ปีที่แล้ว
Free sample flipped video created by CrookED Science to support high school physics students. This video outlines the importance of James Clerk Maxwell's equations and theory of electromagnetism that: - unified electricity and magnetism - predicted the existence of electromagnetic waves - predicted light was an electromagnetic wave - predicted that electromagnetic waves propagate at the speed o...
Physics Pun Guitar Tunes
มุมมอง 1595 ปีที่แล้ว
Guitar footage from the 2019 STANSW Physics Teachers' Conference trivia quiz: Start of proceedings: Sorrow - Pink Floyd. Physics Pun Tunes: - Back in Black(body radiation) - AC/DC - Smells Like 'Tauon' Spirit - Nirvana (pun by Phil Dooley - check out his TH-cam channel 'Phil Up On Science') - Toccata and Fugue in D-fraction Minor - JS Bach - Air on a G-String Theory - JS Bach - Black Hole Sun (...
Smells Like 'Tauon' Spirit
มุมมอง 3906 ปีที่แล้ว
An ode to the Standard Model. Forget the Periodic Table song, we should be singing about the fundamental particles that make up everything i.e. the Standard Model. Performance from Chemistry in the Pub, Sydney, November 2018 Music (and all rights etc.) - Nirvana Lyrics - Dr Phil Dooley (the lyrics can be found here philuponscience.com.au/2018/11/12/smells-like-tauon-spirit/) Guitar (and solo fa...
PhD Graduation
มุมมอง 6K7 ปีที่แล้ว
An abbreviated cut of my PhD graduation in the Great Hall at the University of Sydney. Details of my thesis "Evaluating the Impact of 1:1 Laptops on High School Science Students and Teachers" can be found at hdl.handle.net/2123/16129 Dr :) Simon Crook CrookED Science crookedscience.com/
Physics Experiments Workshop by CrookED Science featured on the news
มุมมอง 8777 ปีที่แล้ว
A news story by WIN News Central West regarding the NESA endorsed 2 day professional development workshop run by CrookED Science for physics teachers regarding the unpacking new Stage 6 Physics Syllabus, associated content and particularly experiments. Information regarding booking such events can be found at crookedscience.com/courses/ Original source: WINNewsCentralWest/videos/12...
Hands-on physics workshop featured on the news
มุมมอง 337 ปีที่แล้ว
Preparing for the new Stage 6 Physics Syllabus in NSW. More details available at crookedscience.com/hands-on-physics/.
Teachers Designing Circuits with a Purpose in Science
มุมมอง 968 ปีที่แล้ว
Teachers at a CrookED Science Workshop (crookedscience.com) at UNE GRASS making 3D spaces with electric circuits incorporated into them. In this instance it's a very nice ferris wheel :) crookedscience.com
Rubber in Liquid Nitrogen
มุมมอง 9K9 ปีที่แล้ว
A nice demonstration of what happens to the properties of rubber after being cooled by liquid nitrogen. This links to the NSW Science & Technology K-6 Syllabus through: - ST1-12MW: identifies ways that everyday materials can be physically changed and combined for a particular purpose - ST2-12MW: identifies that adding or removing heat causes a change of state between solids and liquids - ST2-13...
Air Rocket
มุมมอง 1539 ปีที่แล้ว
A simple air rocket using a 600ml water bottle, rubber bung, valve and bicycle pump used with Year 2. This fits into the NSW Science & Technology K-6 Syllabus through: - ST1-7PW: describes effects of pushes and pulls on objects they encounter - ST2-7PW: describes everyday interactions between objects that result from contact and non-contact forces - ST3-8ES: describes how discoveries by people ...
Play Dough in Liquid Nitrogen
มุมมอง 4579 ปีที่แล้ว
A nice demonstration with Year 2 students of what happens to the properties of play dough after being cooled by liquid nitrogen. This links to the NSW Science & Technology K-6 Syllabus through: - ST1-12MW: identifies ways that everyday materials can be physically changed and combined for a particular purpose - ST2-12MW: identifies that adding or removing heat causes a change of state between so...
The theory of electromagnetic radiation is a lot more complicated than was shown in the video. Basically what was shown was only the farfield solution, where the wave equation is set to zero, generating plane waves. This is valid about 1 wavelength from the source. Closer to the source, the wave equation must be set to an oscillating dipole source. When you do this, a lot of interesting things are seen. The longitudinal Electric field and the transverse Magnetic field are created at the source and propagate instantaneously, reducing to the speed of light in the farfield. The Transverse Electric field is created at about 1\4 wavelength from the source and sends instantaneous propagating fields both back toward the source and away from the source, reducing to the speed to flight in the farfield. Actually the propagating Longitudinal Electric field curves toward the opposite charge of the dipole and creates the Transverse Electric field. This propagation behavior applies to not only the phase speed and group speed, but also the information speed. For more information, search William Walker Superluminal. This propagation behavior has been experimentally confirmed by transmitting radio waves between 2 antennas and measuring the time delay as the antennas were separated from the nearfield to the farfield. Many researchers have confirmed both these theoretical and experimental results, and they match perfectly. Because Relativity is based on the speed of light being a constant, the instantaneous nearfield creates a problem for both Special and General Relativity. In the nearfield, the Relativistic gamma=1since c= infinity, and in the farfield, gamma= the Relativistic gamma since c= farfield speed of light. Since time and space are real, they can not depend on the frequency of light used. This is because c=wavelength x frequency, and 1 wavelength=c/frequency defines the nearfield from the farfield. Consequently Relativity is an optical illusion! Objects moving near the speed of light appear to contract in length and time appears to slow down, but it is just what you see using farfield light. Using nearfield light you will see that the object has not contracted and time has not changed. For more information: Search William Walker Relativity. Since General Relativity is based on Special Relativity, General Relativity must also be an optical illusion. Spacetime is flat and gravity must then be a propagating field. Researchers have shown that in the weak field limit, which is what we only observe, General Relativity reduces to Gravitoelectromagnitism, which shows gravity can be modeled as 4 Maxwell equations similar in form to those for electromagnetic fields, yielding Electric and Magnetic components of gravity. This theory explains all gravitational effects as well as the instantaneous nearfield and speed of light farfield propagating fields. So gravity is a propagating field that can finally be quantized enabling the unification of gravity and quantum mechanics. This propagation behavior has been confirmed experimentally. Simone Laplace in the late 1700's, showed that nearfield gravity is instantaneous, by analyzing the stability of the orbits of the planets about the sun. If gravity propagated at the speed of light then tangential components of gravity to the orbit of the planets would result, causing the planets to spiral away. Ligo recently measure the farfield speed of gravity to the the speed of light. Many researchers have confirmed both the theoretical and experimental results and they match perfectly.
These equations are the work of Oliver Heaviside. "The four modern Maxwell's equations can be found individually throughout his 1861 paper, derived theoretically using a molecular vortex model of Michael Faraday's "lines of force" and in conjunction with the experimental result of Weber and Kohlrausch. But it wasn't until 1884 that Oliver Heaviside, concurrently with similar work by Josiah Willard Gibbs and Heinrich Hertz, grouped the twenty equations together into a set of only four, via vector notation. This group of four equations was known variously as the Hertz-Heaviside equations and the Maxwell-Hertz equations, but are now universally known as Maxwell's equations. Heaviside’s equations, which are taught in textbooks and universities as Maxwell’s equations are not exactly the same as the ones due to Maxwell, and, in fact, the latter are more easily made to conform to quantum physics." - Wikipedia entry for History of Maxwell's equations
Thanks for the quote from Wikipedia. Indeed, Heaviside synthesised Maxwell's equations down as you described. For high school students encountering Maxwell for the first time (and without any mathematical expressions), I skipped that part of the story :) If Maxwell had been a rock star, he'd be far more famous for having died young; being a scientist, he is sadly not afforded the same recognition in everyday society as say Newton and Einstein.
Exactly what type of rubber did you use?
rubber strips and hose from a rubber shop
Curious as to the 2023 cost of that filled container.
hired it from a cryogenics company
Really cool well done on this :)
Thanks :)
Hi, B is not the magnetic field. It is the magnetic induction. The magnetic field is H. Both are linked by the relation B = µ.H
Hi, at senior high school level, B is both magnetic field strength and magnetic flux density - it is an age appropriate simplified model theconversation.com/einstein-was-wrong-not-your-science-teacher-165532
i didnt thought of it breaking for some reason
Very good explanation Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏
I fully agree with comments that it is very clear and concise presentation. One historical correction. however is I'm order. Vector calculus was not available at Maxwell's time. So he wrote his equations as 20 seconf order partial differential equations in Cartesian three dimension coordinates and time. It was then Heavy side who put them in compact vector form known as Maxwell equations. This makes his achievement even more remarkable!
Thanks! Indeed, Heaviside synthesised Maxwell's equations down as you described. For high school students encountering Maxwell for the first time (and without any mathematical expressions), I skipped that part of the story :) If Maxwell had been a rock star, he'd be far more famous for having died young; being a scientist, he is sadly not afforded the same recognition in everyday society as say Newton and Einstein.
I've watched a lot of videos on Maxwell's equations, and this is by far the best one I've come across.
Thanks :)
Great sir... Awesome explanation🥳
thanks :)
Turns into a solid rubber. 😂
Why does it become brittle?
At low temperatures the molecules can’t stretch and any stress remains concentrated in a small area. If the concentration gets too great, the material will fail, creating a crack that can propagate into a fracture i.e. brittleness
@@SimonCrookED thank you very much.
@Kenny I wouldn't say universal, it depends on the molecular make up initially (see www-materials.eng.cam.ac.uk/HRSMaterials/rubber_liquid_N2_demo.html). Regarding marshmallows, he was probably able to squeeze them because of the air inside - the brittle matter would collapse into the cavity spaces.
Hi sir I have a question plz give me answer ..how we remove steel wire from unvulcanized rubber easily?? Is there any chemical formula for that plz answer sir I'm waiting for your response
Well done
Simon, I congratulate you and all the other people with you at the graduation ceremony for receiving your Phds. It was a lot of work and time consuming, but all of you made it and you should all be happy.
Thanks Silvia! It was a very proud moment :)