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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. H

    intermittent slow leak from cold tank?

    Hi all I have a cold tank (polythene, about 30 years old) and recently there was a pool of water around and under it on its plywood platform. There is no sign of leaks from outlet, overflow etc pipes. A few days later it had dried up quite a lot. A few days more and there was new water, but...
    • hba
    • Thread
    • america cold intermittent leak slow tank usa
    • Replies: 6
    • Forum: USA
  2. B

    Sink fills with water when washing machine empties??? Also very slow to drain...

    Hi, Hopefully this is an easy fix...... I have moved into a house and some of the work is 'interesting', things you never see when looking originally. Our latest problem is that the sink fills with water when the washing machine empties and also when you empty the adjacent 0.5 sink. The...
    • BRS82
    • Thread
    • america drain machine sink slow usa washing washing machine water
    • Replies: 7
    • Forum: USA
  3. N

    Slow Shower Leak/Seapage After Showering

    I have a builder-grade framed shower enclosure that is leaking water near bottom drywall and baseboard (drywall near floor is damp but only 3-4 hours after both me and wife take separate showers backtoback (it does not seap when only one of us showers). Shower is 14 years old. I recaulked...
    • Nate2
    • Thread
    • after america shower slow urgent usa
    • Replies: 0
    • Forum: USA
  4. G

    Hello - question related to slow draining bath, and poor toilet flush

    Hi, a new member here, so first of all, hello to the forum! Posting because - I've got a couple of problems in a relatively new bathroom installation. First issue is - the bath drains very, very slowly (and backs up slightly when the shower is in use). The second is, the toilet flush is not...
    • gubar
    • Thread
    • america bath draining flush hello question related slow toilet usa
    • Replies: 8
    • Forum: USA
  5. S

    Central heating takes ages and very slow

    I have got a problem with central gas heating that radios taking minimum of 8 hours to heat and very slow by the time next day comes and we switch off heating. I have tried bleeding radiator and switch on only one radiator at a time and see that removes sludge in system if any I have checks...
  6. B

    Stripped gland nut / slow leak on old lead pipe stopcock

    Hi, I have a stripped gland nut with a slow leak on a 1930's semi stopcock, where the main cold water feed is from a lead pipe. I am wondering whether I could remove and replace from the flange nut (*hopefully correct term), although am not sure of the size I will need. - Photos have been...
  7. L

    Slow hot water after fitting new immersion tank

    Can someone please tell me what I have done wrong. Fitted a new tank exactly as old one recently but since then the hot water pressure up and downstairs has been really low. (E.g. A good 10/15 mins to fill kitchen sink) It is a gravity fed system. No gas. So far tried to clear any airlocks...
  8. M

    Intermittent slow draining toilet

    My downstairs toilet has suddenly started draining slowly (it's been fine since we moved in 3 years ago). It now take about half a minute to empty the bowl, and doesn't cope well with solid waste/toilet paper. At first I thought it was a blockage, as it seems to clear it after a good plunging...
  9. F

    slow flushing toilet - is it the vent?

    Hi all! Hoping to get some advice: We have a slow flushing toilet that I've tried plunging, snaking and chemicals to get going but all of that made no difference. I noticed that if I detached the U-bend from the sink that goes to the same drain the toilet flushed perfectly - this led me to...
  10. D

    Slow running fan effect combustion?

    Hi all. Before I begin, im talking about older ‘on/off’ fans on atmospheric burners. I am not talking about the newer variable speed fans with zero rated governors on condensing boilers. All I’m wondering is, can an on/off fan run slowly when supplied with 240vac? Would this cause higher...
  11. W

    Slow flow - 15mm feed Tee'd off to TWO 10mm feeds

    Hi, I am having some issues with my radiator heat up times on two of my radiators and I am assuming that it is a flow rate issue or something along those lines. I have a 4 bed (large) old semi-detached house. 11 Radiators Worcester 36CDi Compact Combi-Boiler All my rads end up being supplied...
  12. N

    Potterton Prima F40 fan slow

    Just recently my Potterton Prima F40 boiler failed to start in the morning but had been running fine up to then. I noticed a humming rather than the usual fan sound and suspected a fan problem. On inspection I saw that the fan was turning but not very fast and gently tapped the motor with a...
  13. T

    GlowWorm Flexicom slow leak

    Hi, I have a Glowworm flexicom fitted in my house and like most it has an issue where the pressure sensor gets clogged up and you need to increase the pressure or you get an F9 fault. Basically, every few years it needs removing and cleaning. Recently I have notice that there is a tiny leak...
  14. SteveRobert5a

    Drying out after a long slow leak

    Had a slow leak in a first floor bathroom toilet cistern, and it's probably been going for weeks. This is an ensuite that doesn't get used much, and the water was dripping from the service valve and running down the pipe into the cavity, close to an exterior wall. Parts of the chipboard floor...
  15. J

    Viessmann Trouble Slow Heat Up

    Hello Everyone, Viessmann Vitodens 200w fitted with weather comp. I have a Tado V1 which says that the room is too cold and is demanding heat. However the boiler is taking two hours to heat the room and running at 29% output. Something does not feel correct, any thoughts? Julian
  16. B

    Slow draining toilet

    Hi All, We have a slow draining ground floor toilet. Initially I thought it may be blocked as it happened suddenly (4 days ago) so tried plunging and using a drain snake to no avail (drain snake went in about 5Meters with no resistance). The toilet drains into its own stack which then joins...
  17. D

    Slow flow DHW from Worcester Bosch Greenstar 28i Junior Boiler

    Hi, I've got a 7 year old Worcester Bosch Greenstar 28i combi boiler, the dhw flow rate has gradually got slower over time and is now only about 4 litres a minute, the water is consistently hot all the time just slow flowing, all the hot water taps in the house run at the same pace, cold flow is...
  18. W

    Slow water from upstairs taps

    Hi all...new member here, hoping someone can help! I have slow running water from my upstairs taps. The house is a 1980s build with a cold water tank in the loft. I have had this problem several times and am able to cure it by connecting a hose to the tap and sending mains pressure back up...
  19. H

    W/Machine waste very slow draining

    Hi all , I am in new build house , the wash machine is in small utility room . The machine is struggling to pump waste water away , all I can see is a small amount of pipe disappearing into wall / boxing , so my question is do you recommend putting a drain cleaning fluid down pipe if so do you...
  20. A

    Slow dripping L connection under sink

    Hi, I have a leak under the sink and have found the source, that being a L shape pipe connection which is behind some plaster board. To the right of the sink there is a dishwasher and to the left there is a washing machine. The damp plasterboard is due to my genius idea of putting a rag around...
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