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Still having promblem with the proof questions! I would be greatly if someone can help
Kind Regards,
dadon
lol stole my thread!
Hey guys,
Needed some help on 2 proof questions:
1) Prove that the centre of mass of a uniform wire in the form of a semi-circle of radius r is at a distance 2r/pie (sorry don't know how to insert symbol) from the centre.
2) Prove that the centre of mass of a uniform semi-circular laminar of radius r is at a distance 4r/3pie from the centre.
I hope you guys can help. Thanks
kind regards,
dadon
Looking back I made some typing mistakes! in 1) and 5)
1) equation should be 4x - 2y - 5 = 0
5) If the 'equation' of a curve is y=2x^2 -3x -2. Find
a) the gradient at the point where x=0
b) the co-ordinates of the point where y=0
c) the gradient at each of the points found in b)
I mainly need help on question 5)
As I went over this topic last night and can do most of them now.
Regards,
dadon
lol sorry for about this! i just wanted some1 to attempt one of the question so I can have some idea what you do. I know it just seem rude for me to post a whole bunch of qus. So im sorry about that.
and btw this is not home-work just going through past papers and picking the questions I cannot do. As you can see there all about gradients and finding the co-ordinates.
regards,
dadon
Hey thanks I can see what you have done. I wasn't quite sure what it meant by the 'positive quadrant'.
Thanks for explaining the process!
Regards
dado
1) Find the equation of the line through the origin which is parallel to the line 4x - 27 - 5 = 0
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2) The equation of a curve is y = (x-3)(x+4). Find the gradient of the curve:
a) at the point the curve crosses the y-axis
b) at each of the points where the curve crosses the x-axis
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3) Find the coordinates of the point(s) on the curve y=3x^3 - x + 8 at which the gradient is
a) 8
b) 0
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4) The equation of a curve s=4t^2 +5t. Find the gradient of the normal at each of the points where the curve crosses the t-axis.
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5) If the gradient of a curve is y=2x^2 -3x -2. Find
a) the gradient at the point where x=0
b) the co-ordinates of the point where y=0
c) the gradient at each of the points found in b)
Need help for the following question
Find the derivative of:
Thanks its just the chain rule! cool
At least I don't have to learn anything new!
Regards,
dadon
Heys thanks I get what you have done!
Could you explain the composite rule as I havn't come across that.
Thanks agian!:)
I have done part a) of the question which need checking & need help on part b)
a) Find the centre and radius of the following circle:
2x^2 + 2y^2 + -4x + 10y = 8
radius = 3.3 centre = (1, -2.5) << this is what i got
b) Find the equation of the tangent to the circle when the circle intersects the x-axis in the positive quadrant.
How do you do the following rate of change questions
when t = 1.2 for all the following questions:
1) y = 4/t + 4lnt
2) x = sin(t^2 +1) , y = cos(2t -3)
3) x = 1 / 1+2t , y = t / 1+t
4) q = 2e^-t/2.cos2t (e is exponential for this question)
5) x = e^2t.t^3(2-t)^4 (e is exponential for this question)
If someone could help I would be very greatful!
Thanks
thank you exactly what i needed!
i needed some help
how do you so the following rational equation
(x-1)^2 / x-2 = 9 / 2
and also
how do you make y the subject of the formula when
y+2 / y+1 = x
i been trying to solve this all morning!
anyways guys if you can help please
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