Recent content by AlexW

These are beautiful. Not much else I can add.

Yeah I understand that, but surely it is Apples intention that it will be used over 3G too. After all, if I've go access to wi-fi 90% of the time I have access to video calling via a desktop or laptop.

Agreed. I hope this is just a intermediate step while they all get there networks sorted. Although I have to say I don't really know what is required to boost the capacity of a 3G network. It's easy with broadband, more/better cables.

I could live with 500mb if I stopped streaming media. Just seems such a retrograde step. How are we ever going to use video calling with a 500mb cap. the technology is going one way and the networks the other. It's interesting that there isn't an option for heavy users, they clearly just...

Oh that's cool. My data usage for the last 5 days was 600mb. Streaming podcasts and Eurosport player! Although if they decide to clamp down they could easily, I think streaming is against the fair use policy.

Chaps, don't know if you mentioned it earlier but is the iphone 4 using the new mini sim card? If it does this may prove a problem if you want to stick on the old contract with new phone. What do you think?

Hunting filmed in 2007 I think it said.

I thought it was very interesting. At one point he is in Chechnya, and a shell has just landed, the video cuts to him and he is holding the hand of a old guy who has just had his leg blown off. He comforts him for a few more seconds and then backs away, as do the other camera men. No really...

Hi Steve, hope you don't think I'm being patronising, just making sure we actually disagree about something and its not just confusion about terms etc.. The problem is that fora plane taking off on a conveyor as you describe wheel speed = conveyor speed + plane speed, but you say also that...

Haven't had time to read everything else that followed but you still haven't answered the question. You say at the wheel face. So the speed of the wheel is measured relative to it's own wheel face? Maybe you didn't understand the question. All speeds are measured relative to something else...

It is fun. Splog, in your version of this puzzle you say that the speed of the belt matches the speed of the wheels. Could i just ask, the speed of the wheels relative to what?

Damn I must be bored. Any who. If we assume that the wheels rotational speed is taken at the axle and that the frame of reference for the plane and conveyor is the earth/ground: Normally two forces will be acting on the wheel to make it spin, that of the plane (thrust) through the axle and...

Think of it this way: Imagine standing on a treadmill (that is turned on at say walking speed). You are wearing roller-skates. You are holding a rope which is attached to the wall in front of you. It this situation the wheels on the roller skates would be spinning at a given speed. what then...

Unfortunately, as is so often the case with problems of this nature, they have to be stated very carefully and accurately. It should be conveyor matches the 'aeroplane' speed in the opposite direction, not the wheel speed. That would be impossible. For one thing different parts of the wheel...

Splog, you're right that the plane will take off, but wrong about wheel speed. wheels will be 'spinning' at twice their normal take off speed. When the runway is stationary they would spin at a certain take off speed. But now the runway is also travelling backwards at the same speed as the...