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1. original measurements were unreliable. (only made once) 2. pH meter not specified to have been properly prepared / calibrated.

hmm fair enough. does the Reimann integral restrict d(x) for x being a variable function?

d(5)/dx = 0 therefore, d(5) = 0 therefore, I = 0

yes but that is the same with quantum physics, i.e. frequency determines the energy, from E = hf. I think the most important thing to say here is that because energy is quantised in quantum physics, intensity is irrelevant to frequency/wavelength. hence the graph is not a simple proportionality...

for ext1, it's very uncommon to have worked solutions - i know of a few independent excel books like "maths extension 1 sample exam papers" which has a lot of practice questions. also there is the phoenix book (green cover) with complete worked solutions, but not a very large number of...

A good mark would have the same numerical value as my number of posts edit: oh i will post again, just need to delete old posts first. i wonder if that actually lowers your post count hmm <------------

ctkid, that's not baulkho is it? judging by the huge english population.

turned out to be quite easily solved. for some reason, when i did the very long method of differentiating f(x) and then solving f'(x) = 0 and then subbing the two roots back into f(x) = 0, i got 2 values of m. [now i think the other m is outside the domain of m] but yeah, this way only has 1 m...

by considering the points of intersection of the curve y = x³ - x + 2 and the line y = mx, show that there is only one tangent to the curve which passes through the origin any ideas?

i had a look at 2, and i think it's fairly hard - more of a challenge question. you need the sort of manipulation skills that are more expected of ext2. i'll have a go at it tomorrow, but i just did a bit of it and it was a bit tough. (particularly part 2. weird chain rule)

go to itute.com they have the 05 and 06 solutions

i used to play - got coached weekly for about 2 years. it's fun just like any other ball sport.. you can run around and swing the racket. and in badminton, it doesnt matter how hard you swing, and unlike tennis, the shuttlecock won't go out!! excellent stress relief you know. but that being...

okay let me try to explain this one: first let me explain something you'll need later. if an object is at a single height above the ground, and is suspended there (whether on top of a table, or just floating there), the entire system does not experience a net acceleration. this means that when...

still looking for an answer.

hi, just trying to clarify a few simple truths. since c is constant, and speed = distance/time, this means that for light to remain at a constant speed, if distance increases, time increases, and similarly if distance decreases, time decreases. now suppose we have 2 different inertial frames...

draw the graph of f[x] = 1/(x-1)(x-3) there's a double root at x=2. and asymptotes at x = 1 and x = 3. therefore, 1<x<3, excluding 2

having only one electron in its valence shell means that it can easily acquire the stable configuration of 8 electrons in its outermost shell by donating away one electron. this is why it has a low first ionisation energy, and why it will generally stay as Na+ in compounds. to extract the Na...

put it into the form rcos(x+a) = -3 then, expanding, rcosacosx - rsinasinx = -3 equating coefficients, rcosa = 5 and rsina = 12 cosa = 5/r and sina = 12/r consider a right triangle, with sides 5, 12, r (with r being hypotenuse and angle a adjacent to 5) from pythagoras', r = 13. and a =...

yes so the procedure for doing |y| = f(x) is to draw y = f(x), then discard everything below the x-axis, and finally reflect everything above the x-axis about the x-axis. (reiterating what others have said)

Re: i need to lose weight FAST drink water before meals. this is the hardcore method. alternatively, eat an apple before meals. it achieves the same effect, but at least you're still getting some nutrition.