Search results

re: HSC Physics Marathon Archive For DC motors, a changing flux caused by relative motion between an external magnetic field and the motor coils will induce an EMF induces a current that creates a magnetic field to oppose the change that caused it in the first place. In contrast, a changing...

A flexible essay comes from a flexible thesis!

I think the most powerful theses are those that can point out that discoveries can facilitate a fresh/renewed understanding of the world and people because it's a broad and versatile statement With this point in mind, also mention the texts that you are writing about, and then find a key...

re: HSC Physics Marathon Archive Assess the impacts of A.C. generators on society and the environment

Re: HSC 2015 4U Marathon bl. I'm assuming you used a^2-b^2/a^2 ? (for ellipse)

Re: HSC 2015 4U Marathon b^2 = a^2 (e^2-1), e^2 = a^2+b^2/a^2 e = 17/15

Cool. I was also thinking, consider your statement: torque ∝ 1/speed of rotation As the speed of rotation approaches 0, i.e. the motor becomes stationary, then the torque experienced by the motor approaches infinity! Therefore, the rotational force, when rotational speed is really small is...

What makes you think that? I think to make the rotational speed increase, more rotational kinetic energy is required, and hence, more rotational force (torque) must be experienced by the coil So they are probably proportional

And unfortunately, it seems that most textbooks/notes do not distinguish between the two

I think a property is something that the aether HAS, and a feature is like functions of the aether model For example, properties include: Low density Transparent High elasticity and features include: Filled all of space Permeated all matter Stationary/absolute frame of reference

LOL

Re: HSC 2015 2U Marathon How did you do it? I took the integral of 1/x -2 +x bounded by x= 1 and x =4

Re: HSC 2015 2U Marathon ln4 +3/2 ?

I loved the quote "we shall meet in a place where there is no darkness," But behind the characters and the plot, the underlying message seems to be a critique of the totalitarian society that most were living in at the time. I think the book may have been influential to the audience as they may...

They gave you nothing at all? I'm pretty sure integrating cosecx is not required by the 3U syllabus

I solved I by converting both to sinx and cosx, then letting u = sinx

Well here's my 2 cents.. I was just wondering, if there was a net force, then would it still be considered a stable orbit? A net force would cause it to deviate from its circular path i think

Could you please give us an example of one of your theses?

What it looks like in those questions is that F represents the 'applied force' on the conductor, and so, the force due to the induced current is in the opposite direction. So basically, reverse the direction of F and then use RHP rule. e.g. for b, the new F is to the right, and current directed...

No, I stated that the induced current creates the opposing force, or opposing change in flux, not the EMF.