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the macquarie chemistry revision guide has it all in there

oh thanks, i differentiated but didnt know where to go from there

the angle at which the spacecraft enters the atmosphere during re-entry is also important: if the angle is too steep the acceleration will increase, hence increasing g forces

I have just one more question: If ax^3 +bx^2 +d =0 has a double root, show that 27a^2d =4b^3 =0 thanks....

it was in my EXT2 text book

it depends, if you already do a physical rec and a skill or service, it doesnt really take up much extra time at all. on the other hand, if you dont do any of them it's obviously gonna take up more extra time coz you have to start doing them. it's really worth the time though. i signed up...

and (x+1)^2(x-5)

they are the same thing, my text book says " a zero of multiplicity 1 called a single zero"

lol all these different names for things gets confusing

thanks i've got it now

the answer is c=-5 or 27

oh thanks i'll try that

oh :( can i email it to you then?

I have this question which I really can't work out. Can someone please help? If P(x)=x^3 -3x^2 -9x +c has a double zero, find c and factorise P(x) over the real numbers. Thanks

Here's my working out for part a if you want it: http://www.msnusers.com/cba9s1i0v5kq2hv7vg5cm21ja6/Documents/Pictures%2Fphysics.jpg

Do you have the answer for the question? I think I have worked it out. We were using the mass of the satellite when we should have using the mass of the Earth.

yeah but im not really sure if it answers the question

During re-entry the spacecraft must reduce its speed by about 90% to find height use: v^2= Gm/r (v=velocity, G= 6.67 x10^-11, m=mass, r=radius) oh and you probably have to subtract the earth's radius potential energy= -G m1m2/r on Earth potential energy is zero

yeah we only just started talking about the section on special relativity before the hols

i dont really know of any current issues........there was a locust plague a little while ago, i dont know if thats still an issue....probably not, but anyway. try looking at department of agriculture sites if you haven't already