Recent content by Dirac

A piston pump having a barrel of effective volume 100cm3 is used to exhaust a vessel of volume 2.5x(10^3)cm3. If the initial pressure in the vessel is 1 atm, estimate the reduction in pressure produced by two strokes of the pump, assuming that all processes are isothermal and that air behaves as...

:smile: Dirac.

Have you tried posting something useful up, you sarcastic prat. When in parallel the current is shared in each component according to (V/Ri) Whilst in series equal current goes through each component Dirac.

Could you just post the answer, or would it get up your backside to post something useful in your life Dirac.

How does one find the vertex

So far I have got to this ((y-3)^2)=4a(x+2) What now Dirac.

vertex (-2, 3), focus (0,3) Find the equation of the parabola. Dirac.

Oh ok, done it now. Dirac.

It is not linear By Pythagoras' (x^2)+(y^2)=(r^2) y=5-0.5t r=5 =>(x^2)=25-(25-5t+0.25(t^2)) =>(x^2)=5t-0.25(t^2)

Yes, I can do it, but I get two solutions for t from (x^2)=5t-0.25(t^2) Dirac.

Yes, ok but what is x(t)

Could you please do a step-by-step solution Dirac.

"a 5m ladder is placed against a wall. the top of the ladder is sliding down the wall at 0.5m per second. at what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 3m from the wall. ? " Dirac.

Limit f(x)=\lim_{x\rightarrow 0}(\frac{\sin x}{x})\\ =\lim_{x\rightarrow 0}\left( \frac{x-\frac{1}{6}x^{3}+\frac{1}{120}x^{5}...}{x}\right) \\ =\lim_{x\rightarrow 0}\left( 1-\frac{1}{6}x+\frac{1}{120}x^{4}\right)\\ x=0->\lim_{x\rightarrow 0}(\frac{\sin x}{x})=1 Dirac.

Ferro Magnets Imagine electrons orbiting the atom. As they do so they also spin, since they are charged particles they produce magnetic inertia and a tiny electric current and so this produces a tiny magnetic field. In some atoms, or in fact materials the magnetic effects of such electrons...