Search results

There is nothing wrong with the Physics in Robert Farr's book, but I think he wrote that section in 2017 before he had studied the new syllabus properly. You don't need to calculate the root mean square value of a sinusoidal voltage for HSC Physics (if you are doing 4-unit Maths then you should...

Yes, it is in the syllabus. Mod. 6.4.2 "Students: analyse the operation of simple DC and AC generators and AC induction motors." I have some video resources for this bullet point.

Students interested in studying Biomedical Engineering usually complete a mainstream undergraduate engineering degree (Mechanical, Electrical, Chemical) before enrolling in a post-graduate course on biomedical engineering. They may commence an undergraduate course in engineering and then...

Good question. Do a case study into the Crowdstrike Windows Falcon Sensor faulty deployment that brought an estimated 8% of the Windows PCs in the world to a screeching halt. The dreaded "channel 291" patch. That shouldn't have happened.

Oh hang on, wait a minute, I just realised the question is ambiguous. Remember Kirchoff's Circuit Rules which says, "the sum of the emfs around a circuit must come to zero." The question asked, "indicate the polarity of the terminals P and Q when this occurs." This is ambiguous. There are two...

I agree with everything you have said. Where did you find this question? Wrong. Voltmeters have a high resistance. There is no such thing as a shortest route in electricity. Electric current follows the path of least resistance, which would be clockwise around the loop.

The answer is (C). Recall that sound waves are longitudinal waves, so the meaning of these graphs needs some clarification. The vertical axis is amplitude of something, presumably it is displacement of air molecules, but it could be air pressure. The horizontal axis is almost certainly time. The...

This method is known as back titration, and you need to practise this method. Essentially back titration is used when there is a practical problem with direct titration of an unknown sample with a standard solution. In this case, the problem is calcium carbonate is insoluble, and hence you can't...

If you are confident your answers are 100% correct, then ask your teacher for their opinion. "Does my HSC mark fairly reflect my achievement in this course?" Only in exceptional circumstances will a school lodge a results query, and it needs to be done by the Principal. I think the closing date...

Sorry to say, I believe the marker is correct. The reason you lost marks is not because of your sentence structure. It is always a gamble to ask for a re-examination of your paper. You are unlikely to gain anything, and you may in fact lose more marks.

The covalent diagram is fine. Covalent bonds are directional and have definite angles between the bonds. Covalent molecules have a molecular weight. Ionic bonds are very different. Be careful you fully understand what that diagram is saying. That label that says, "ionic molecule" could be quite...

That is correct. The spacing between the crosses (or dots) indicates the strength of the B-field. For questions about the motor effect, you must use the strength of the B-field. However, if you are dealing with a question about electromagnetic induction (Faraday's Law) \epsilon = -...

You can look up tables of ionic radii on the Internet, or if you can get hold of a copy of SI Chemical Data by Aylward and Findlay, look up Properties of the Elements, ionic radii in there, in units of picometres. When sodium and chlorine form an ionic lattice (note- your model must represent a...

Quolls are a very adaptable species. Their range stretches from Far North Queensland to Tasmania. This marsupial species is tolerant to a wide range of temperature and sunlight. Unfortunately, the Australian Quoll is frequently killed on roads. Hence proximity to busy roads is a strong factor...

DISCURSIVE: Your proposition has to be argued in rambling and circuitous way, and whilst remaining engaging and not too annoying. You are speaking directly to your audience. You start with an observation about life, which could be a broad generalisation. Then you can circulate from argument to...

Remember that these drawings are just a model of magnetic flux. The number of crosses or dots represents the magnetic flux. This is the model that Michael Faraday invented. Faraday postulated that there was some sort of magnetic fluid that flowed from north poles to south poles, the magnetic...

Physics is based solidly on problem solving. It's not like repeating a page of equations. Some students find the mathematics hard not because the equations are hard but because they are not used to interpreting a written problem and expressing it mathematically. This is the most important skill...

The sign in Lenz's Law is not decisive in this question. Look more closely at the diagram. The current is measured by a galvanometer in series with the circuit. The polarity of the galvanometer is not shown on the diagram. Therefore, the direction of the current through the loop is not...

You wouldn't expect to get a question asking you to graph results from a first-hand investigation. A more typical HSC Physics graphing question would be something like, "A magnet is dropped through a conducting loop. Draw a graph of the resulting EMF versus time." OR "How does the kinetic...

The magnetic flux density around a long, straight conductor is circular and symmetric. It varies as 1/R outside the conductor, and within the conductor it varies linearly down to zero flux at the centre. It is a non-uniform field. To calculate the flux outside the conductor you use integral...