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good question, anybody got a quick answer?

holy crap i have got it! You can sleep well tonight buddy knowing you taught me this and i got an extra mark in the exam tomorrow. lol

Can somebody give me a brief outline of thier experiment to view the spectral lines for hydrogen.

I think i have it now. So i point my fingers towards the negative wire that is in the mercury, while pointing my fingers up in the air (assuming i put my hand on the right side of the magnet) . My palm now points in the direction of the force. I dont think thats what you were explaining as i...

sorry, yeah i use the right hand palm rule. u point your thumb in direction of current and fingers in direction of magnetic field. Your palm shows the direction force

yeah i use the right hand rule in which you point your fingers in the direction of the current and your fingers curl in the direction of the magnetic field around the wire.

yep i get that but dont know how this gives the direction of rotation Is the direction for these types of questions just the way the magnetic field goes around the wire.

Just combine the Magnetic force equation (it has a B and sin(theta)) with F=qe to get the velocity then the centripetal force with the same magnetic one to get the charge to mass ratio (q/m)

yep you are right about the directions however i cant understand what you mean. The magnetic fields are going perpendicular to each other.

Just a quick explanation In the cathode ray tube thomson balanced out the magnetic and electric fields so that the cathode rays were not deflected. By equating the expressions for these forces he was able to calculate the velocity of the electrons. He then swithched off the electric field...

North Pole facing up

In success one p 26 there is a multi choice which asks which way the wire will rotate in faradays famous experiment when the reservoir of Hg is negative and the rod that rotates is conected to the positive terminal. I have read their explanation for the answer and still dont get it. Like i...

can we really consider the emf as eddy currents. I thought eddy currents were small oscillating circular currents.

Just a quick question, what are electric ranges?

I dont see why the person in the train would see the lightning strike he is travelling towards first as he is moving towards it and hence away from the other. I think u are getting mixed up with the light flashes on the train and the ones off the train.

O.K. since that question is answered i will ask Q) why if the smaller the radius of a satellites orbit the larger the velocity does a satellite spiral towards earth. Like if the resistance causes it to slow down wouldn't it want to go into a higher orbit?

Hmm 2003 and 2002 seemed difficult to me, but maybe that was because i did them before i had studied heaps. I think last years projectile motion question was a killer, however the rest of Q)7 was doable. Unlike this years were i only got about four marks because of the length of the exam

Yes they would both see the light approach them at c but for your next statement you are thinking that the train stops at the split second the lightning strikes, however it is really travelling at relativistic speeds and thus he would appear to be travelling towards one strike and away from the...

I think people have to realise that they have to make the exam long and difficult as we are competing against 4u students. In saying that i don't think it was much more difficult than the past years exams It is kinda like us for 2unit i guess, we might think it is easy as we do a strp higher...

i dont understand why each is multiplied by 5!