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2012 HSC Engineering Studies examination Question 24 (d) sectioned assembly view. This question was really hard to interpret, because the examiner has not indicated on the pictorial drawing where the section plane is supposed to go. There was a missing dimension as well. The external diameter...

2021 HSC Engineering Studies. Q22 (c) An electric skateboard battery is rated at 0.078 watts at an operating voltage of 48 volts. Calculate the capacity of the battery in amp-hours, if it fully discharges in one hour of use. The power (P) is given by the formula P=VI. COMMENT What sort of utter...

"Critically analyse the test ..." In every science prac, we have an Aim and a Method. Then when you write your Conclusion, it must relate to your original Aim. Did you achieve what you set out to prove, etc. Did any uncontrolled variables interfere with the success of your method, etc. So...

Essen paved the way for the modern definition of the second, so he is significant. Essen's method of measuring the speed of light was a bold departure from optical methods. He used a microwave cavity resonator, with interior dimensions known to within a few micrometres. The resonant modes of the...

There is only way Cepheid variable stars can be brought into HSC Physics assessment, which is indirectly through Module 8 - Origins of the Elements - Dot point 2 - "Investigate the evidence that led to the discovery of the expansion of the Universe by Hubble". This dot point sits uncomfortably...

Controlled vs. Uncontrolled. This is usually defined by the neutron generation rate. It would be wrong to define it in terms of the number of fissions because each fission releases 2.5 (on average) neutrons, and you have to absorb 1.5 neutrons. For controlled chain-reaction, the neutron...

Good question, the mass loss appears as energy of many forms - the specific forms depend on the nature of the decay mechanism. The decay products will have kinetic energy, which is heat. Nuclear fission gives rise to kinetic energy of the daughter nuclides and kinetic energy of the daughter...

If you haven't seen a lot of spectroscopy examples, it can be hard to do questions. If you have and iPhone or iPad, I recommend you grab a copy of the Monash University Chemical Detectives app, it's a free app in the AppStore. It's a fun and engaging way to learn problem-solving with...

I will try to explain this in the context of Year 12 Chem, and Module 5 solubility equilibrium. Solubility and Ksp increases in the presence of attractive forces between ions and polar solvent molecules. Ion-dipole attraction explains for example, the enhanced solvation of ions by a polar...

1. The syllabus is asking students to think about repeatability, which is what NESA means by reliability. We want you to learn how to identify and quantify sources of random errors, rather than plugging numbers blindly into a calculator. Anyway, I think it would be extremely rare in Stage 6...

In my humble opinion, I disagree with Matrix explanation for MCQ 20 being (D). The essence of the problem is that horizontal and vertical components of motion can be independently analysed. The vertical component of motion is subjected to only the constant gravitational force; on this point...

My bad ... there is a tiny emf induced in the through-thickness direction, but nothing end to end ... so the answer is (C) no e.m.f.

2020 HSC Physics MC Question 16 (the fission reactor question) There seems to be bit of confusion on this forum about the speed of fission neutrons. In a typical atomic fission, the velocity of the neutrons is around 1 MeV (or about 10^7 metres per second). In order to interact effectively with...

homeworkatedog wrote: what about colours? (in reference to Q.32) ---- You could include quark chromodynamics, but that is probably a bit beyond what the syllabus requires. For example, none of the recognised textbooks for the new syllabus include quark chromodynamics. You could mention that the...

homeworkatedog wrote: How is 19 (A)? EMF isn't induced at any positions of the B-field when rotated . ---- The motional e.m.f. definitely will be produced when the conductor cuts lines of magnetic flux. We don't know the area that the conductor presents to the flux, but let the thickness of the...

Question 32. The mass will stop accelerating when the power output of the motor equals the rate of work being done to the mass. Let the terminal velocity of the mass be "v". Let the tension force in the rope be "T". (v) x (T) = power (watts) The power output of the motor is the first limitation...

If I have time I will post some more answers. Here is a sample ... --- Question 25. Describe the hydrogen atom in terms of the Standard Model of matter. (4 marks) ---- The hydrogen atom consists of one proton ( a hadron composed of three quarks and carrying one unit of positive charge) and one...

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2020 HSC Physics Multiple Choice Answers 1 - D, 2 - A or D both correct, 3 - C, 4 - B, 5 - B, 6 - A, 7 - D, 8 - C, 9 - A, 10 - B, 11 - C, 12 - D, 13 - A, 14 - C, 15 - D, 16 - A, 17 - D, 18 - B, 19 - A, 20 - A It will be interesting to see what the head of marking decides to do about Q.2 They...