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Eddy currents are not a force, which is what he was asking about. The "eddy currents " produce a magnetic field. The interaction of the two magnetic fields produces the repulsive magnetic force I was talking about.

I'm assuming your asking about the meissner effect and levitation. So repulsive magnetic force supporting the magnet equaling the gravititational force pushing down.

Please go back and read the original thread. http://community.boredofstudies.org/134/uai-hsc-marks-technical-arcana/6642/explanation-hsc-marks-moderating.html http://users.on.net/unix/HSCmarks.pdf Yes your rank is important but the gaps in assessment marks also have an influence.

That was my worry about the solution

Any spark is going to be a transmitter. A small crystal radio could act as a receiver. Not sure how succesful the strength of the signal will be.

The right hand grip rule is specified for determining the direction of a magnetic field around a current carrying wire. To determine the direction of a force or induced current in motors and generators there is no rule specified. The rule I mentioned above is commonly known as the "right...

It is personal on which rules you use. I prefer to only use the right hand palm rule. The thumb of your right hand always represents the current. (One current, One thumb) The fingers of hand represent the magnetic field lines (Many lines, many fingers) The direction of the palm is the direction...

Standard air pressure is 760 mm Hg. Your tubes are calibrated with an old mercury barometer, where they measured air pressure based on the difference in level between two tubes of mercury or the outside level and that in a vacuum http://www.met.tamu.edu/class/Metr304/Pressuredir/pressure-pg9.html

It doesn't so without the question and your answer I can't see why you received the mark

Both. The rotaing magnetic field produces eddy currents to oppose the change in flux. The interaction between the original magnetic and magnetic field of the eddy currents produce a torque rotating the motor.

Waste of time Board of Studies inititive to stop plagarism. Compulsory part of the HSC as of 2008. http://amow.boardofstudies.nsw.edu.au/

The AC induction motor is the only AC motor you have to describe. Squirrel cage is an example of the AC induction motor. You have to read dotpoints as a group not individually when working out what you have to know.

It is the ranks and the gap between the marks. There are no gaps in ranks.

This is incorrect as explained in the thread on moderation. http://community.boredofstudies.org/134/uai-hsc-marks-technical-arcana/6642/explanation-hsc-marks-moderating.html The full process is explained in the pdf document http://www.users.on.net/~unix/HSCmarks.pdf

No, the subject performance descriptors are not comparable between subjects.

Try just a wire loop with nothing inside, except a light wooden axle. Couple ideas at: http://www.scientrific.com.au/PDFs/em2193-201.pdf http://home.hiwaay.net/~palmer/motor.html

The gap in your assessment marks is whaat counts more than the raw marks. So as well as aiming for the highest rank as possible. If you are not going to obtain first, then aim for the smallest gap possible behind the people ahead of you and the largest possible above the people behind you.

This is very dependent on you. If you are going to apply yourself and top your year in each subject, then the rest of your school has no effect on you. If you work better in a "hot house", where you are striving to beat everyone else and raise according to the level of the competition then you...

Like it or not they weren't after the trajectory around the moon based on: The only way home for the astronauts was to fly around the back of the Moon and then fire the rocket engine to take the craft out of lunar orbit and put it into an Earth-bound trajectory. At the completion of the...

s is displacement not time. u=0 as it is assuming they are just falling, not diving down. "falling vertically from rest" The squared for a is in the units, you don't apply it to the formula