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When you see a constant in an equation in physics, what does it mean and what is its purpose? This has always puzzled me... What about this whole deal with "using SI units", etc... What influence does a change of units have on constants in physics? I read in Wikipedia that certain units exist...

How do I solve this question on the parametric equation of the parabola from the Fitzpatrick Mathematics Extension 1 book: 24(c): 19. The normals to the parabola x^2 = 4ay at the point P(2at, at^2) and Q(2as, as^2) meet at R. Find the co-ordinates of R in terms of t and s. If st = -2, find the...

Ohm's law states: I = V / R . Jacaranda Preliminary HSC Physics states that measuring current on both sides of a resistor will give the same reading. But if you go by Ohm's law, increasing the variable R will decrease the value of the fraction V / R (k/x -> 0 as x -> infinity - basic maths)...

Like everybody, I know about the HECS-HELP payment scheme. But I'm a little confused, I haven't quite comprehended completely or properly what people have been telling me or what I have read on the information website. To put it bluntly (without going into further details about my stupidity in...