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In my post above I described the displacement of a car in two different experiments. Here is a more mathematical reasoning. In the static experiment, the car slides down the inclined plane. That is the car's displacement with respect to time. Velocity is the first derivative of displacement...

@anonymoushehe Yes there are two cases for the normal force. The problem here is you haven't told us what is the motion of the object on the inclined plane. I agree with liamkk112 that you should discard those green vectors, they are distracting you from a proper understanding the free-body...

You are doing your HSC in October 2025, right? Don't stress about it, just learn from the mistake. Another thing - there is a big difference between 2 radians and 2 degrees, so make sure you do a reality check on all your answers. Don't just write down what ever the calculator says without...

@Isaackapoor I would dispute the idea that the gas exiting from the balloon is somehow an expression of entropy. The connection between Chemistry and Physics that you mentioned is already well known - it is called thermodynamics. Sorry to deflate your balloon. Yes, it is a spontaneous process...

You didn't mention if the digitiser still works (the bit that responds to touch), or if the screen glass is cracked. If the case only has a very slight bend, then an Apple repair shop should be able to gently bend it back again.

Question 22. The centripetal acceleration of a car executing circular motion on a flat road can be described by ac=v2/r If the friction with the road is suddenly half, then the centripetal acceleration must be half. The velocity must reduce to \frac{v} {\sqrt(2)} Question 23. Which part can't...

There are many proprietary international standards for drawing network diagrams. Yes Cisco has a very large library of their own symbols but they are only one amongst many. Strictly the Cisco symbol library is only supposed to be used to describe Cisco networks; shucks to you if you have...

The Solvay Process was a focus in the old (pre-2017) NSW Chemistry syllabus. If you can get hold of a copy of the old Jacaranda Chemistry Year 12 textbook by Thickett, you will find about 5 pages of detailed description of the Solvay Process. Australia once had a Solvay plant at Osborne, in...

It is not uniform circular motion (UCM). The orbit of the satellite is an ellipse. An ellipse is a stable orbit. The object is not going to crash. The force that keeps the two objects gravitationally bound together is the gravitational attraction vector that always points towards the centre of...

Question 32. Analyse the evidence from at least three such experiments about the interaction between light and matter. The examiners have made this question way harder than they imagined. If a scientist did not do experiments, then their work should not be mentioned. For example, Einstein did...

Regarding 2024 HSC Physics Question 19 I just finished analysing the second proton, and if it stays within the chamber, then its motion will be an ellipse. The best answer is (C).

Don't feel too bad about this. In the sequel to this story, called "Planet of the Apes", the monkeys have the guns.

This is reminiscent of "The Monkey and the Hunter" problem. It goes like this (this story is not very politically correct, btw). A cheeky monkey keeps stealing bananas from the farm. The farmer gets a gun and waits for the monkey. The farmer spots the monkey hanging from the top of a tree with...

You are probably more correct to draw SFD as you did.

You are quite right, sir. I am indebted to you for checking. I will fix up the worked solutions.

The information in that question makes no sense. It starts off talking about a sample of river water, and then it goes straight to the calibration curve. There is no mention of the test result on the sample. Something has been deleted.

Oops ... the answer is 0.8 millimetres. Thanks for pointing that out, I used the wrong expression for the circumference of a circle. Doh!

Hi everyone. I did another copy of my answers to the 2024 HSC Engineering studies examination. Can somebody go over my answers and check if they are all correct? Thanks to FudiddidoAdrian and tomn22 for constructive feedback. This is the corrected copy.

CD-ROM as others have said, is a read-only technology. Disc diameter is 120 mm and 1.2 mm thick. The standard data capacity is 680 Megabytes. Data is encoded as a spiral track containing a series of pits on a thin layer of aluminium, sandwiched between two very flat layers of plastic. Data is...

No, you won't be tested on obscure rules. There are international standards for drawing network diagrams, but you are not required to know them in IPT. However it is very useful if you can use pictorial symbols like these for the common building blocks of computer networks.