2013 ATAR 98.002014-2018 BOptometry(Hons)/BScience(Vision Science) @ UNSW
2013 ATAR 98.002014-2018 BOptometry(Hons)/BScience(Vision Science) @ UNSW
Almost a correct solution
However, for one complete revolution the distance is r2pi.
It's a minor error, probs only lose 2 marks
Although in the future try not to just use formulae without thinking
Describe three applications of the CRT and all features and characteristics of each application. (8 marks)
bump
(F=mg, W= Fr (Tungsten = Francium )) (BUT REMEMBER THAT GPE IS ALWAYS NEGATIVE!!!)
(1)
(Draw a triangle of the object at rest at the starting position)
(2)
Therefore, substituting equation (2) into (1) gives us:
Now someone have a go at my last question before I forget the band 6 response!!! (8 marks)
Describe three applications of the CRT and all features and characteristics of each application. (8 marks)
Last edited by anomalousdecay; 23 Apr 2013 at 8:18 PM.
It's Latex: http://www.codecogs.com/latex/eqneditor.php
Question: Explain why the motor of an electric drill is more likely to overheat when the drill is experiencing a load.
When the motor of an electric drill is experiencing a load, its rotational speed lowers which in turn lowers the back EMF of the motor. Net EMF = Supply EMF - Back EMF. If the back EMF is decreased, the net EMF increases and so does the current flowing through the coils of the motor. The greater the current flowing through the coils the greater the electrical power lost to heat by power loss=I^2*R making the motor more likely to overheat.
“Physics is to mathematics like sex is to masturbation.” —Richard Feynman
If you couldn't be bothered learning LaTeX, then you can just use the equation system on Google Docs (https://drive.google.com/), then use http://puush.me/ to take screenshots of it.
Insert -> equation gets you started and there's a toolbar for a bunch of mathematical symbols and what not.
It's really, really easy to use. ^ is superscript, and _ is subscript, etc.
Questions:
1. Explain why Michelson and Morley expected a change in the interference pattern received by the detector of the interferometer.
2. A circular disc of conducting material is rotating clockwise. The bottom part of the disc is in a magnetic field going into of the page. Explain what happens to the disc and why.
Last edited by Hypem; 27 Apr 2013 at 2:00 AM.
Explain the purpose of using a radial magnet in a galvanometer.
According to the equation F=BIL sinx , where x is the angle at which a conductor is orientated to an uniform magnetic field, once the galvanometer needle is moved, the force induced will vary as the needle moves. Radial magnetic fields are uniform within a consistent radius from the centre of the field, at the tip of the needle. This means that as the needle tilts, its angle to the radius of the circle of particular strength will be 90 degrees. This occurs because the needle and magnetic field form a radius and tangent.
Hence, a radial magnetic field provides equal force on the needle, no matter how much it is tilted. Since a galvanometer detects tiny currents, it is necessary to have a uniform magnetic field as the needle is tilted, hence the use of the radial magnetic field.
Someone do my question if they are bothered . 3 posts, but still failed to be answered.
Describe three applications of the CRT and all features and characteristics of each application. (8 marks)
Last edited by anomalousdecay; 30 Apr 2013 at 6:59 PM.
Sy are you doing q2q? I might do Age of Silicon or q2q.
Hence we need to shrink the Earth to a radius r, whereby,
Calculations then follow to find the new radius of the Earth
========
A new follow up question:
It isn't directly related to the Physics syllabus but I think its rather interesting, but of course can be answered with HSC physics knowledge, just a bit of imagination.
Last edited by Sy123; 3 Jun 2013 at 12:02 AM.
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