Thu 18 May, 2006 08:27 pm - The cylinder has a volume of 30m^3
What dimensions will use the least material...
SO we have
V = pi.r^2.h
SA = 2pi.r^2.h + 2pi.r.h
i try to find the surface area in terms of one variable... (view)
Fri 5 May, 2006 06:53 pm - that small error was a transference thing, my bad, it was actually + 2 in the expansion.
Shouldn't the 2nd derivative that u show be
-2[ 2x(x^2+1)^2 + 2x(x^2-1)(x^2+1)] / (x^2+1)^4... (view)
Tue 2 May, 2006 05:46 pm - Thats is one part of it, but also to find the possible points of inflection when d^2y/ dx^2 or the second derivative is equal to zero. So i need to find the second derivative, at least i think i do. (view)
Mon 1 May, 2006 12:27 am - I redid the derivative and ended up getting:
(-2x^2 + 1) / (x^2 + 1)^2
which is what u got.
I found the second derivative to be:
(-x^5 - 2x^3 - x^2 - x) / (x^2 + 1)^4
Im not sure if... (view)
Sun 30 Apr, 2006 07:03 pm - (x + 1)^2 / (1+x^2)
Finding the first derivative using quotient rule i get...
2 / (x^2 + 1)
To find the turning points ur supposed to let it = 0 and solve for x, by factorising. Thats... (view)
Fri 24 Mar, 2006 11:55 pm - I am confused by the relativity of this question. I 'll state the question below
A Plane can fly at a maximum speed of 500km/hr (relative to the surrounding air). There is a wind blowing at... (view)
