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So you see how ridiculous it is teaching us all these names in physics? You understand why? don't try to patronize anyone, you don't understand why. And I guess you see maths as a very mechanical and 'dry' subject? Exactly.. for example nowhere in the course am I offered an...

Those used in proper transformers are insulated (coated with enamel) Think should use these. Dicksmith sells them, costs about $6-8 a spool. (use to be $4 :( ) by the way, thick wire for coil with less turns, not neccessarily the primary coil, (I assume you were making a step up one when I...

Btw use thick wire for the primary coil

keep them closer -> better, compare the fields that's produced by the two ways of winding( think carefully, don't use the simplified description textbook gives). But it would make your job more difficult than spreading them out, because you would have to ensure each layer is "saturated" with...

You are mistaken, There isn't much theory in the course, the theory they teach is very shallow, the only things which are abundant are 1. Jargon, and 2. History. to prove my point, The dot point on the rocket scientists -> superfluous, physics is not about learning the life of a person is...

Any iron core would do as long as it isn't too thin(recommend 2 cm diameter), if you don't need anything above 60% efficiency. Would be great if you can get laminated ones though. If your school has an industrial arts faculty you might want to talk to the teachers there, they usually know what...

Approach: Derive the location of the particle in parametric form, with time as the parameter, i.e x and y in terms of t. solve these 2 equations for the range and maximum height of the particle, noting that at half the range, (22.5) the particle is at it's maximum altitude...

e^x^2 = e^(x^2) because (e^x)^2 could be simplified into e^2x 2^n-1 = (2^n) - 1, indicies before subtraction.

The normal reaction means the force which the incline plane exerts on the block. Solution(A little wordy, I don't set work out too well :( ): The only forces acting on the block are 1. Gravity of magnitude 2g downwards 2. the Normal reaction force. The normal reaction force does...

What I did was: Solve simultaneously the equations for tangents at Q and Q' to find R. and found: R has paramatric representation: x=a[cos( (m+n)/2 )/cos( (m-n)/2 )] y=b[sin( (m+n)/2 )/cos( (m-n)/2 )] Substituted the coordinates of the focus into the equation of the chords PQ, PQ'...

maybe Z' for the conjugate of Z Integral / b | F(x) dx / a But I think spice girl's notation is better/more convenient. <SUB>subscripts</SUB> and <SUP>superscripts</SUP> takes time to type for the average typist, I recommend I_n, unless the work gets messy. Even I(n) would...

Here are some Usual ones a^b means a to the power of b |x| means the absolute value of x / means divide * means multiply >= means greater than or equal to <= means less than or equal to sqrt(x) means the squareroot of x cbrt(x) means the cuberoot of x, but I don't see this often...

I did :( still can't think of a better way to do it. have you?

bashed it, turned out to be an ellipse indeed x^2/a^2 + y^2/[b(e^2+1)/(e^2-1)]^2 = 1 did anyone find a more *elegant* (easy) way of doing this?

I don't mind most 'assess' dot points(although they tend to make things very subjective), but those points about the history of physics is purely irrelevant. I am sure we can learn physics without reading Newton or Einstein. There's a difference between not reading tonnes and tonnes of...

approach (Omit): deduce equation of tangent then find it's X and Y intercepts, use ratios for similar triangles to find PX/PY. Then use the fact that the latus rectum has x coordinate ae to deduce the required equality +++++++++++++++++++++++++++++++++++ (Derive equation of tangent in...

I am quite stuck with this question P is a variable point on the ellipse x^2/a^2 + y^2/b^2 = 1 S, S' are the Foci of the ellipse. PS, PS' meet the ellipse again at Q, Q' Respectively. The tangents to the ellipse at Q and Q' meet at R. Find the locus of R. So far I can only get up to R...