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In everyday use and in kinematics, the speed (commonly referred to as v) of an object is the magnitude of the rate of change of its position with time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel the knot is commonly used.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

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  1. J

    Ticking boiler

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  2. H

    Dura speed 70 - Hot water stopped working on shower

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  3. R

    Speed fit fitting blown

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  4. Stanios

    Speed awareness course rant

    worked my arse off all week now comes saturday quick job in morning followed by a 4 hour speed awareness course... penalised for driving 70 on dual carriage way in my transit connect van. Its half size of range rover weighs 200kg less. with my tools probably the same as a fat ******* driving a...
  5. G

    JG speed 22 to 15 reducer for compression?

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  6. C

    Does Slower pump speed= better condensing

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  7. T

    Speed fit for condensate

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  8. L

    Black John Guest Speed Fit fittings...

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  9. KingDoey

    Hand Held Speed Trap

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  10. A

    Speed in plumbing ?

    How was your experience when you first started getting the hang of things ? How easy was it bending multiple bends etc ? How ow was your speed in plumbing, did it get faster by time and experience?
  11. S

    How to check fan speed

    Can someone tell me how to check the negative pressure on a fan step by step please? Also if a boilers high and low co2% are set up correctly on high and low I assume that means the fan must be spinning fast enough anyway? I like to think I'm pretty good at fault finding Its just something...
  12. plumb_know

    Builder + plumbing = speed fit

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  13. M

    Speed fit??

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  14. T

    Will changing an old boiler in the garage speed up hot water getting to the taps?

    Hi All, I moved into a new home last July and thought the old Potterton boiler was broke, because hot water could take minutes (often several), to reach the taps in the house. The pipework goes up into the loft and then back down into the main house. If I change the old boiler for a top of the...
    • tommyg01
    • Thread
    • boiler changing combi could garage getting hot hot water oil old speed tap taps water
    • Replies: 21
    • Forum: Plumbing Jobs | The Job-board
  15. jonnyswamp

    secondary return copper or speed fit

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  16. MZR

    Alpha 2l pump

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  17. W

    Silicon Lubricant and JG Speed Fit?

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  18. Dan

    Page loading speed

    Made a few changes and upgrades server-wise to cope with the traffic across the network and you should notice a really big increase in page loading speed times.
  19. I

    The dreaded one pipe system conundrum!

    I've installed a new Worcester 30 CDI Regular this week, Replacing an old glow worm energy saver 80, everything going well up until the cold fill, that's when things took a turn for the proverbial. Cutting a very long story short, what looks like a very neat S plan in the cylinder cupboard, is...
  20. Chalked

    Speed with Guy Martin

    Anyone watched this? the blokes amazing or an absolute nutter!
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