syadnom

think of it like this. from any one point, the speed of light must always be the speed of light. so if you travel near the speed of light and you turn on your headlights, you must perceive that light as traveling at the speed if light. Your perception of time will then be slowed by the same ratio as the speed of light - your speed = v so v:c is the same ration as (your time):(a viewpoint at rest relative to your speed). I dont know if that helps but you should be able to conceive that there is no actual or relative time. time is just time, there are no varieties. also, light would have no point of view. light is a special thing and does perceive time as it is traveling at the speed of light, it will experience no time. That may be why it is a special thing, because it has no time, no halflife, never expires.

Though the US likes to do mm/dd/yyyy, I like yyyy/mm/dd as it sorts better! I have heard it all over the US, Canada, and Europe as nine-eleven spoke in english even in France, Denmark, and Germany.

I am not a racist, but I am also not blind to the delta between races. I think, through some investigation and some experience, that there cant be a single test to determine intelligence. It would be accurate to say that white Europeans score generally higher IQs than Africans. That is just a single number. What about those things that arent measured by that IQ rating? How about creative thought? Social aptitude? How abouve physical traits? Some races are going to have abilities tuned to their culture for that last couple thousand years. Africans are seen to be more physically capable on average that many other races, Japanese tend to handle engineering well as a result of a few thousand years of imperialism and honor codes which gives long attension spanse or whatever. Though it may seem like a loaded question, I think that if modern society could get past the IQ thing more people could see these other strengths in races. We are obviously a world of many races but are starting to blend them all. In 10,000 years what will mankind look like? I doubt there will be much distinction between races in the general population.

I am trying to size a heat exchanger for a solar water heater. It seems that most people online tend to either buy a prebuilt exchanger with some arbitrary "good for 3 people" rating or just wing it. I googled to death but either google is to dumb or I am too dumb to find the answer. Id like to take what I know which is: temperature of incoming water temperature of water in holding tank volume / second of incoming water heat volume of water (4.18 kj/kg) where 1kg=1liter so if I have 40*F incoming water (using *F for degree symbol) and have 160*F water in the holding tank, how many square feet of surface area do I need to get the 40*F water up near 160*F? I would be using copper coil. I can get 1/2" OD copper coil for the best surface area to price ratio so I would use that. 1/2" OD copper has a surface area of 18.5" per 12" length. it has a volume of .0386 liters per 12" length. can someone help me on a formula for the heat transfer from the holding volume to the incoming water over a length or coil or surface area. there are some assumptions here. The holding tanks temperature can be assumed to not be affected by the incoming water. The 160*F goal temp is over the needed temperature as I will be using a tempering valve at about 102-106*F so the the drop in temp in the holding tank from the heat exchange should not be noticed. thanks in advance.

There are a few issue with using a flywheel. 1, the flywheel is a a gyro and will resist changes to its angular movement. This requires that the whole flywheel be mounted in a 3 axis gimbal setup so that the flywheel is allowed to float within the gimbals so the car would be allowed to change the plane of momentum, for instant changing from flat road to a hill or a banking turn. Because of that, the charging and recovery system cannot be mechanical as that would interfear with the gimbals. so now you must use a generator/alternator mounted inside the gimbal and much get the electricity out through the gimbal structure. This is fine except that the gimbals must be mounted so that the positive pole and the negative pole are isolated. You would also need seperate electric drive motors. As far as flywheel breakdown, you should just overengineer the flywheel material. That will increase costs but consider how dangerous gasoline is and you can make a good case that the flywheel is much safer. oversimplified efficiency would be (mass of the flywheel * speed of rotation / mass of the car * desired speed) * efficiency of alternator and wheel motors. with modern magnetic bearings and high strength materials this would be a small engineering feet. someone just needs to have the money to invest and access to high tech materials and capable manufacturing facilities. i suppose this is really just a mechanical battery with electric power transfer.