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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

    My boiler hot water flow rate is slow

    Vaillant Ecotec Pro 28 Running 7 radiators. Outside Tap Cold water flow rate = 12l/s (it took 5s to fill 1l pot) Kitchen Tap - just running cold water = 4 l/s Bristan Shower Mixer - cold water rate = 12 l/s Hot water rate is really low The boiler heats up the water fine -its nice and hot...
    • Justice League
    • Thread
    • america boiler flow flow rate hot hot water slow usa water
    • Replies: 9
    • Forum: USA
  2. D

    Basement pipe in wall slow leak. Does it need to be cleaned out?

    Hi, I am new here and I need some help with a home repair. I have this pipe located in my basement inside my wall made of concrete that is showing signs of water leaking onto my basement floor. There is no leaks from the pipe itself, the water is only coming from the bottom where the concrete...
    • DOITYOURSELF92
    • Thread
    • america basement cleaned leak pipe slow usa wall
    • Replies: 4
    • Forum: USA
  3. D

    Basin slow to empty

    Having a slight problem with the basin slow emptying. Plunnging it helps a little, i have taken the trap off and its clear, the pop up waste is clear, the waste runs into the internal soil stack, i think the issue is a flat run of the waste for about 2 meteres along the floor. I did ask the...
    • Deneva
    • Thread
    • america basin empty slow usa
    • Replies: 4
    • Forum: USA
  4. T

    Slow filling cistern, lot of air

    The cistern has been filling fine for nearly a year, then in the last week or so it has been taking ages to full. Taking thr cover off the symphonic release is working and sealing fine upon completion. The float on the fill is working, but when it's filling their is a trickle and a fine spray...
  5. L

    Bathroom sink very slow drain mystery

    The bathroom was refitted 10 years ago. Everything was fine until a couple of years ago. The basin is very slow draining and you can see the water coming up from the P trap and then filling up the basin. I've tried drain unblockers etc. and also put a hose with a snug fitting nozzle into the...
  6. R

    Hot Water Taps all running slow then stopping

    Hi, I have today removed our bath ready to put a new one in and have capped both the hot and cold feeds off. However, when putting both the hot water (turned off as cold feed on to the cyclinder) and cold water back on (turned off at both the stop tap under the sink and the cold feed in the...
    • raggaroo
    • Thread
    • america hot hot water hot water pressure running slow taps usa valve water
    • Replies: 3
    • Forum: USA
  7. S

    Hi have a potterton performa 24he hot water flow is very slow. Have changed plate heat exchanger and made no difference any ideas?

    Hi have a potterton performa 24 he hot water flow is very slow. Have changed plate heat exchanger and made no difference heating is fine any ideas?
    • Steve embassy
    • Thread
    • america changed difference exchanger flow heat heat exchanger hot hot water ideas plate potterton slow usa water
    • Replies: 14
    • Forum: USA
  8. B

    New Kitchen Tap - slow drip

    I bought a new kitchen mixer tap. Link below. https://www.wrenkitchens.com/aurora-tap-chrome-high-low-pressure/8901 Every time I walk into the kitchen, I see a drip on the end of the tap. I remove the drip, to discover another drip on the end of it after about couple of hours. Now, is there a...
    • BrianCox
    • Thread
    • america drip kitchen new slow tap usa
    • Replies: 1
    • Forum: USA
  9. R

    Shower/ Sink very slow to drain to macerator

    I have a macerator which does a toilet, sink and shower in our basement, it has worked fine for 2 years then water started backing up into shower tray so I took the macerator out (3 hr job due to location) and the non-return valve had come a bit loose. Repaired that, gave it a good clean out...
  10. D

    Slow dry solvent cement for ABS

    Hi, does anyone know of a slow dry/cure solvent cement for ABS waste pipes please? Got some 50mm floplast ABS waste pipes in a tricky ceiling that will be a pain to get the cement on, line up and push together before the normal solvent cement goes off - in the 15 seconds you get to fit them...
    • DaveTaylor1174
    • Thread
    • abs america cement slow slow dry solvent solvent cement usa
    • Replies: 3
    • Forum: USA
  11. Jeffrey Griffin

    Kitchen hot tap flow v slow

    Hi there. Have a carron mixer tap in kitchen the flow on the hot tap side has become very slow for no apparent reason. To almost a trickle...was never like that previously. Hot tap in bathroom.upstairs is strong. When I remove the connection under the sink the flow seems good and strong but...
    • Jeffrey Griffin
    • Thread
    • america flow hot kitchen slow tap usa
    • Replies: 4
    • Forum: USA
  12. P

    slow draining from shower tray

    hi guys and girls need a bit of advice from a plumber or that, i fitted a new low shower tray and its draining very slow i have to switch off power shower to stop water getting close to the top of tray all i changed was tray it came with its own waste trap and connected it with flex pipe as...
  13. K

    Glow Worm 38cxi slow startup

    Our Glow Worm 38cxi boiler is about 15 years old. When turning on the central heating in the morning, the boiler fires for a moment and the pump starts, then the green light goes off but the pump continues to circulate the water. The temperature of the water on the boilers digital display drops...
  14. T

    Blocking a slow leak

    I am preparing to refinish my bathtub. The tub faucet leaks one drop/second. Obviously, I can't begin spray painting with a wet tub. What can I use to block the slow leak for the 3 days it takes for 2 coats of paint to dry?
  15. S

    Worcester Keyless Fill Extremely Slow

    I've got a Worcester Greenstar 38CDi Classic ErP with a keyless filling link. One of the rads has a tiny leak so every few months I have to top up the system (and bleed a rad upstairs). I should get the leak fixed but since it's so minor I haven't bothered. My actual problem is that the system...
  16. I

    Slow pump leading lots of air.

    Hello. I have a vented system. My boiler has been cutting out. Checked and bled all radiator. Checked the tank in the loft is full and water coming in when ball pressed down. The retern to the boiler is very hot so expect pump is too fast, as it is set to max speed (3) so slowed to mid speed...
  17. M

    Hi I have slow rising pressure in boiler

    Hi I have slow rising of pressure in boiler not sure why but blue valve its fully open and black one closed..read on web that both should be closed is that true? Trying to attach pictures
    • Mateusz Sito
    • Thread
    • america boiler pressure rising slow urgent usa
    • Replies: 4
    • Forum: USA
  18. M

    Grundfos Alpha 2 AutoAdapt is slow

    Hi folks be glad of some help with this as its puzzling me.🤔 I have an Alpha 2 15-60-130 pump serving 12 Rads with thermo valves and Hot Water cylinder. The boiler is an Alpha CD18R Since I had another rad installed downstairs I've noticed the heating pump has been noisier than usual ie...
  19. N

    Gurgling toilets and slow draining bath.

    I’ve got a new build that’s approx 3 years old. A couple of weeks ago the downstairs toilet started gurgling due to the water level in the bowl being low. I plunged it and that seemed to allow the water level to rise (although still not as high as I would expect). Recently however I’ve started...
    • NitramA
    • Thread
    • america bath draining gurgling slow toilets usa
    • Replies: 8
    • Forum: USA
  20. L

    Help! Mould smell in wetroom after slow leak and mould removed behind false wall

    Hi everyone, new to this forum and would greatly appreciate any advice. We installed a walk in shower with a false wall to conceal the shower, toilet and wall hung sink pipes. There was a slow leak which led to a lot of mould growth. We opened the shower pockets and cleaned pretty much all the...
    • london
    • Thread
    • after america behind falsewall help leak mould removed slow smell usa wall wetroom
    • Replies: 7
    • Forum: USA
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