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Research has shown that teachers have the 2nd highest impact on a students learning, first obviously being the student themselves. If you are learning new concepts, it's a lot harder to make sense of it yourself, then having a teacher who knows what they are talking about and how to explain it...

Re: If I roll a marble down a ramp and of the edge of a bench or something why does . This could be attributed to a few things. The two marbles surely do not have the exact same surface, the smaller marble may have a slightly rougher surface, resulting in more frictional contact between the...

The answer is (c), not (d) as you have to convert from metres to kilometres!

I had my students use the F = BILSin(theta) formula They measured the force exerted on a current carrying conductor, by placing a piece of wire on an electronic balance and measuring the difference in displayed 'mass' on the scale when a current was passed thru it when it was placed in a...

BAH! Not to a quantum physicist :D Although, I have looked through the syllabus and some resources on it and it does indeed look interesting and perhaps i will teach it one day. I just find the whole idea of quarks, leptons, nuclear physics etc... so interesting! My students cant wait til that...

I got 4 mates finishing up their Ph.D in nanotechnology this year, done some interesting research! 2 of them have secured research positions within the uni, getting paid decent (approx 55k) Not sure if they are doing any lecturing.. But i think it is something like $100/hr for lecturing and...

Not sure about the truth behind "scaling" of different electives, i imagine it would be somehow, just not sure how. I know last year Baulkham Hills High did Astrophysics, and they had the person which came 1st overall in Physics in NSW

Jump in a car with one of your parents :) Reset the trip meter, drive for 10 minutes. Record the distance travelled in 10 mins, calculate average speed and look at the speedo every minute and record the instantaneous speed :) EASY :) Do u need to complete the practical or just write it up? If...

Not sure i quite understand you question? Why dont u give an example of what u think is tricky? Ur approach seems correct, when talking about clocks and what not, the person who is in the same reference frame as the clock is the stationary observer, although really they are moving, which is...

Wouldnt make a difference whether it was in hours or minutes, it would just change the resulting units for you answer, but essentially would come to the same answer. The answer in the back of the book is wrong. They forgot to square root the denominator before dividing it...

Yep, just what everyone else has said. Geostationary orbits are along the equatorial plane. Sydney does not lie on the equatorial plane, so a satellite placed at the same altitude as a Geostationary satellite would not appear stationary. It would appear to be geosynchronous, which basically...

Seeing as the first q was done, i'll do the second one :) Firstly, u need to split the vector into it's components, seeing as it is at 45 degrees, you should expect both ux and uy to be the same! Ux = UCos45 Ux = 56.57ms^-1 Uy = USin45 Uy = 56.57ms^-1 Now, we need to figure out how long it...

4b) ii) 8!/2! = 20160 6a) ii) Tan(23) = h/OA OA = h/Tan(23) OA = hcot(23) Tan(32) = h/OB OB = h/Tan(32) OB = hcot(32) AB^2 = OA^2+OB^2-2(OA*OB*Cos(60)) 200^2 = h^2(cot^2(23)+cot^2(32)-cot(23)cot(32)) h = 200/((cot^2(23)+cot^2(32)-cot(23)cot(32)^1/2) h = 96m

Quite simply put, remember from the preliminary course: Velocity = distance/time yeah? :) So, think about this. If two observers, travelling at different speeds both observe the speed of a light beam to be the same, then the length and time interval which is measured by both observers must...

Think about reference frames. If the speed of light is constant in all reference frames, then space and time must change depending upon the velocity of the frame of reference. Basically talking about time dilation and length contraction If space and time change depending on the velocity of...

But no one had gotten all the answers correct!

1 a) Ok, firstly what do we know? a = -9.8ms^-2 Sy = -200m uy = 0 t = ? s = ut +1/2at^2 -200 = 0 + -4.9t^2 t^2 = -200/-4.9 t = 6.39s The answer given (4.52s) is incorrect b) So, at halfway down Sy = -100 It is not sufficient just to take half of the time as random did as the object is...

Geezus, every bloody time i come on to see if questions need to be answered, you have already answered them! FFS! :D

Perhaps you should read my first post? :) Lorentz' interpretation of Maxwells equations was that if the Ether was immobile, then because of this, the speed of light relative to the Ether is constant and does not depend on the motion of the observer Eg. A person moving at half the speed of...

The constancy of the speed of light stems from Lorentz' interpretation of Maxwells equations, of which Einstein was a 'fan' more or less (Ether is immobile) If the Ether is immobile, then as a direct consequence of this the velocity of light relative to the ether is constant, irrespective of...