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Don't be too discouraged by the inaccurate results. This is quite normal for student first-hand investigations of enthalpy of combustion. The errors are huge. You are right about the incomplete combustion causing an error; it is much more difficult to achieve complete combustion for pentan-1-ol...

Yeah that should be good. In the equation ac=ω2r then you are changing the parameter "r", I'm sure that if you keep an open mind and you are observant that you will think of other related measurements. And don't miss out on going on the Rotor (but take a sick bag, just in case).

You are in Year 11, Yes? What you will need to understand and be able to apply in Year 12 Physics is the different models for light. There is the wave-front model and the ray model and you need to know the advantages and disadvantages of each model. The light ray is always normal to the wave-front.

If you are doing amusement park rides, then it's probably not practical for a student to change the parameters of the ride. According to the Luna Park website, the angular velocity of Volaré is 17 revolutions per minute but it must start from zero and accelerate up to some maximum angular...

Suggestion: fix the grammar in your aim. The verb doesn't make any sense. 20 pages is too much for a Year 11 depth study. If your hypothesis is 200 words, that is ridiculous. Your hypothesis should be no more that 2 sentences, so 30 words.

Since you are making a video then you must obtain the frame rate from the metadata in the video file. The frame rate might vary between experiments. Do you know the frame rate? The blur in the position of the ball is caused by the shutter speed of the camera. If the shutter speed of the camera...

Plan your answer on a spare page at the back of the paper. One minute spent mind-mapping your answer will save time, gain your more marks, avoid mistakes, and it will make your answer easier to read and mark. Oh and don't forget, "a picture tells a thousand words" so a well drawn labelled...

If that's exactly what those authors said about preparing a standard solution, well their opinions are wrong.

ANSWER: no effect on the concentration of the standard solution. The two critical parameters for making a standard solution are you must have an accurate number of moles inside the flask, and the volume must be made up to the scribe mark with distilled (or deionised) water. The temperature of...

Sound resonance in tubes works like this: Air molecules can oscillate as a longitudinal wave up and down a tube. An open end is always an antinode, because the air molecules are free to oscillate without any restraint. A closed end is always a node, because when the pressure wave arrives at the...

Now I know it is a bit hard for high school students to obtain apparatus for a first-hand investigation. Your research can be a first-hand investigation or a second-hand investigation of other people's data; they are both valid for depth studies. You could investigate modern devices that exploit...

To gain a solid understanding of the evidence for the photoelectric effect, I recommend students watch this video. It's an oldie but a goodie. Don't worry about the wooden Physics professor who does the demonstration; he knows his stuff, that's all that matters.

Yes there is. Go to https://pubchem.ncbi.nlm.nih.gov/ The Published Chemistry Database of the National Library of Medicine. From there you can branch to all the other chemical databases.

That is correct. The answer is an irrational number, but in an exam you have to choose the closest option which is (C).

Actually in the solution it would have been quicker to state the law of triangles, sum of the interior angles must be 180o and therefore the gradient of the line CB must be -1.

The free-body diagram has three vectors as shown below.

This is the Double Slit Experiment. Go look up the Physics formula sheet and you will find a formula that links the positions of constructive interference in the interference pattern with the wavelength of light and the spacing d between the slits. Then you just have to interpret the information...

Yes, the hypothesis needs to be in there, otherwise what are you investigating? Your hypothesis creates the inquiry question, and your hypothesis must be referred to in your closing remarks to determine if you achieved what you set out to do. Spoiler Alert: drag force is not proportional to...

I chose my point of reference as the top of the cliff, so distances are measured from the top of the cliff.

@kkk579 The answer given in the paper is wrong, btw. There is nothing fundamentally wrong with your calculation, but there is no need to include the mass of the block. All objects fall at the same rate regardless of their mass. You can use the standard equations for uniformly accelerated motion.