Archive for June, 2006

Bah

Monday, June 26th, 2006

Emma is revising, and i remembered this, I wonder if this is a popular meme/puzzle question. I think i first heard it from Samson Abramski who used it as an example, its quite clever i think.

“I have an amazing scheme whereby I can guarantee that I can beat a grandmaster at chess.”

Can you guess what my scheme involves?

Wedding Shakedown

Monday, June 26th, 2006

The wedding happened more or less all to plan, thanks to everybody who came, we really appreciated it.

This is all pretty boring, if you were there you probably already know what happened

Question

Tuesday, June 20th, 2006

The escape velocity of a body is the projectile velocity required in the absence of friction for a body to not fall back towards the source body under the force of gravity, correct?

The event horizon of a black hole is defined as the point at which the escape velocity equals the speed of light, right?

And _everybody_ knows that once you go past the event horizon of a black hole you can’t escape, right?

But if escape velocity is simply the balistic velocity required for escape, what if you are accelerating under your own power? I mean rockets leaving earths orbit don’t have to reach escape velocity, they can maintain an aribitrary velocity so long as it is positive?