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General Science / People that interfere with electronics etc

« on: 15/09/2005 22:53:34 »

My mates new girlfriend cant wear a digital watch because it just stops, and i have heard of people who cause interference on tvs etc when they walk too close to them. Would anyone be able to tell me what causes this?

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Physics, Astronomy & Cosmology / Re: Light emitted *at* the Speed of Light

« on: 15/09/2005 22:37:40 »

the bit i cant get my head around is the light you are emitting is already travelling at the speed of light, so as you emit more light it cant travel away from you as it is already going max speed possible.


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Just Chat! / Re: Brain Teasers

« on: 15/09/2005 22:10:32 »

Or if the lightswitches are just outside the door - open door, flick the switches, see which one works, enter room


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General Science / Re: Walking on non Newtonian liquids

« on: 15/09/2005 21:40:27 »

Nice....thanks []

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General Science / Walking on non Newtonian liquids

« on: 15/09/2005 19:08:57 »

I understand that it is possible to walk on a non newtonian liquid, such as custard, as when you impact the surface it forms a solid column underneath you.

How does this work? Why dont you just sink in like you would with thick mud, and if it forms a solid column, why doesnt this dissipate into the non solid liquid around it?



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Physics, Astronomy & Cosmology / Re: Light emitted *at* the Speed of Light

« on: 15/09/2005 18:50:50 »

ok, so i read that thread and understand now that the light would look like its travelling away from you at light speed if you are in the vehicle, and everything would just look like its going the same speed to a bystander...

but where does the emitted light *go*. it looks like its moving away at the speed of light, but this cant be possible if you are already at that speed, otherise the light beam would have a "real" velocity of lightspeed+lightspeed

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Physics, Astronomy & Cosmology / Light emitted *at* the Speed of Light

« on: 15/09/2005 18:10:20 »

If you are in a vehicle travellling at *exactly* the speed of light, what would happen if you turned on the "headlights" and therefore projected light in front of you.

Nothing can travel faster than the speed of light so where does this light go? does it build up like a shockwave then disperse when you slow down?

Also, would it look different to someone travelling IN the vehicle and to a bystander on the "roadside" ?

This ones been bugging me for a while so a definitative answer would be great!