Recent content by kbaumen

Ok, cheers guys, that explains it.

Ok, yes, I admit, that year was a shot in the dark with the main thing being that different times have elapsed. So you're saying that the ship is then a lightweek away from the Earth when it stops. But the ship's clock says that is has traveled for only a day. Does that mean that the people...

I'm sure this has been asked a million times but a quick search didn't give me quite definitive answers so here it goes: Imagine a spaceship traveling away from the Earth at 0.99c. For argument's sake, let's ignore the acceleration and deceleration stages of the ship (is that valid?). Simply...

Cheers, that actually makes sense. Integrate over area and divide by area.

Homework Statement Frictionless, inviscous flow in a circular pipe. Velocity profile, v(r) = 6 - 6r^{1.828} Volume flowrate, Q = 9 \frac{\text{m}^3}{\text{s}} Pipe radius, R = 1 m Given velocities, v(0) = 6 m/s, v(R) = 0 m/s. Find mean velocity v_{av} 2. The attempt at a solution...

Have you heard about Octave?

Not very helpful but nonetheless interesting in my opinion: My high school physics teacher had a small vacuumed glass casing with a tiny metallic axle with three metallic wings, or rather sails on it inside the casing. If the casing was placed in sunlight, the contraption inside would start...

If you want to use integration by parts for the first one, there is a certain substitution that would make it quite simple. Can you see it?

Have you tried expanding the brackets on the numerators?

Ok, cheers man.

Oh yeah, I had incorrectly input it in the wolfram integrator. The integral indeed cannot be expressed in terms of elementary functions. So how do I go about the integral I have?

Homework Statement \int_{C}(xy+\ln{x})\mathrm{d}s where C is the arc of the parabola y=x^2 from (1,1) to (3,9) Homework Equations \int_{C}f(x,y)\mathrm{d}s = \int_{a}^{b}f(x(t),y(t))\sqrt{(\frac{dx}{dt})^2+(\frac{dy}{dt})^2}\mathrm{d}t The Attempt at a Solution Ok, so...

My mate bought his whiteboard on e-bay. 40 GBP for a 1800 x 1200 whiteboard which I think is quite big. I've been contemplating this as well, seems like a great idea. Leave a wee corner for schedule and the rest for problem solving. I've also noticed at uni that it's much better to solve...

Sorry for not making it clear, but I was indeed referring to the dot between the function and dx.

I assume the dot there is an accident then, it doesn't mean anything.