TimbaLanD

I see... it’s cheaper to make photons than to store them!! It would be cool to put the photons in a transparent bottle so that they glow forever!

Sev!! Thanks for that... it all made more sense except the last one… I didn’t understand why you were referring to a light bulb because light bulb is constantly emitting light. So, what you are saying is: If I make a perfect mirror which reflected 100% of light (Say in a cubicle) and I stand inside. If I put the light on so it emits light, right? So if I turn it off, the cubicle will be still bright as though if the light bulb is on??? Please clarify..

If photons have no mass, how can it be pulled in to a black hole? Another thing that baffles me is, why can’t we harvest light? If the star light we see in the sky originated form millions and millions of years ago and it’s only reaching us now. It means that light is constantly travelling through space (?). So the light does not decay. It just travels at C through space. If mediums can slow light, surely we can find a medium to “ultra slow” light so that we can actually observe its path of motion (Theoretically). So, why can’t we harvest it? Why can’t we put light in a bottle and keep it on our top shelf? Hope I am not asking silly questions!

Hi all... I have a mass flow rate of 9800Kg/h substance through a heater. If the temperature of the substance is 0deg c and the min tem to be at 15deg c. Specific Heat Capacity: 1040 J/(kg*K) 1. how much heat do i need to apply? 2. How much power do i need to generate that heat? Anyone?

I see... that is hard to grasp but I think I should polish up on “relativity theory”. I do find it hard to understand.

This may sound really stupid, but why cant massive bodies travel fast? I am sure Newton’s law states that an object travelling on a straight line will continue to do so until an external force acts up on it. So, why can’t we travel at high speed in space? Maybe I have been watching too much voyager but I am trying to understand the basics.

NO time? now i am totally confused!

Thanks guys for all your comments. I am a little confused with twin paradox. The only way it makes sense (to me) is by imposing speed to time. As I understand it, time slows down as we get close to C. Therefore the speed of time somehow is slowing down(?). Say if I am standing on earth and I see a rocket passing by at C with a passenger inside, do I see the passenger’s actions in slow motion? Will the passenger see my actions in fast motion? This is why I am keep going on about time having a speed, else it makes no sense to me. Another thing that confuses the daylight out of me is the speed of light. If I am at the back of a bus that travels at 10mph and I start walking from the back to the front of the bus at 2mph, my speed relative to the ground is 12mph. What if the bus is travelling at C and I do the same, why will I not be travelling at C+2mph? If I do, surely I have exceeded the speed of C.

Does time have speed? In another word, what is the speed of time?