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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. E

    UK Slow draining toilets and gurgling, help please

    Hello, would greatly appreciate some pointers Toilet downstairs drains slowly. First floor toilet causes bath to reflux water and make noise. Second floor toilet causes shower to gurgle. Tried Mr Muscle drain unblocker almost everywhere. Tried plunging the toilets, shower and bath. Tried a...
  2. N

    Bath draining slow and water pooling issues

    Hi, I have a few issues with my bath drainage and leaking. The first issue is that the near corner of the bath by the taps is sloped downwards meaning that it pools in the corner and quickly starts leaking through gaps in the shower screen onto the floor rather than into the bath. The rest of...
  3. J

    Why is my toilet flushing slow

    I took the toilet off. No clog. Put it back on and it's still has the issue of water rising before draining very slowly. Took 2-3 flushes just to get rid of toilet paper.
  4. C

    Slow Flush in toilet

    Hello My toilet flush is busted. The tank takes about 10 seconds to empty and it’s kind of showers down from the middle, rather than that sudden gush that surrounds the entire bowl. It does not generate enough force to really dispose of the waste. I replaced everything in the tank. The...
  5. S

    Water draining slow any ideas

    Hi,my shower is very slow draining.the trap is clear of hair/debris,any idea of what could be the problem?
  6. A

    Hot water very slow new mains pipe fitted

    Hi all Just had a new mains water pipe fitted and the hot water is very slow almost a trickle. We have a combi vaillant ecotec pro 824 and it seems to come out fast to begin with then slows down considerably. It seems the boiler is struggling to provide hot water at the adequate rate that it...
  7. daniel218

    Slow tap flow after new tap valve

    Recently had a repair done on a leaky tap they replaced the tap valve on my bathroom 1/4 turn taps, now the hot tap flow is slower What my problem please and what could I do to fix? They is no areiator on my taps
  8. T

    gradual slow hot flow all taps

    This is probably a basic one, but just wanted to check. Hot water flow to all taps has gradually been getting slower over time and the thermostatic shower now needs to be turned up hotter to get a reasonable shower temperature. Its a vented cylinder heated by an oil boiler and the cylinder stat...
  9. A

    Vaillant EcoTec pro 28 - Slow CH start up

    Hello all, Im wondering if you can help? Ive got a Vaillant Ecotech Pro 28 which was installed 9 years back and has worked like a dream all its life, however this Autumn I've unfortunately started to face issues with it. I've noticed that its taking 10-15 mins for the CH to kick in when...
  10. K

    New Shower Valve, Slow drain

    I have installed a new shower valve and shower head (the restrictor um fell out) and as a result the tub starts to fill with water. I believe this is simply a math problem of more water coming in than can drain but asking if any known options. As a sanity check I did snake the drain and...
  11. S

    Slow filling toilet problem

    Hi I’ve got a very slow filling toilet which upon opening the cistern is due to the water coming very slowly out of the pipe and into the cistern. In the attached picture the cream plastic spout is where the water comes out and into the cistern but it’s just a trickle. I’ve checked that the...
  12. O

    Slow drain toilet with old & new AAV but fine without

    Hi all, Hope you're well. Anyone any ideas... randomly 2 of our toilets started backing up when flushed (2 on same stack 1st floor and ground, 3rd loo (2nd floor) on its own seperate riser is fine) and takes circa 10s to level out. When flushed you can hear the gurgles and burps from the...
  13. C

    I have fitted flowmasta bottom fill valve. the water flow

    I have fitted flowmasta bottom fill valve. The water why flow is very slow. Anyone any ideas why
  14. P

    how do I fix the cold water faucet that is barely running?

    My upstairs cold water faucet just barely streams out.. The cold and the hot in the shower are fine but not the cold water of the sink. Is there anything I can do myself without calling for a costly pllumber?
  15. S

    Slow leak on my pressured central heating system

    Hi, new to this forum. I hope someone experienced out there can help me find the fix. We recently finished a building project and had a major re-design/move of all of our hot water (megaflo), boiler and central heating system. I am not a plumber nor do I know much about plumbing but I know...
  16. X

    slow draining toilet following pan connector replacement

    Hello All, We recently had a plumber out to replace a pan connector as the previous set up had developed a leak, however, following the replacement the toilet doesn't drain properly - the flush starts off ok, but partway through the water levels starts to rise, it then takes ages to drain, and...
  17. A

    Radiators very slow to heat up

    Radiators very slow to warm up on ground floor. I live in a two storey house with unvented hot water cylinder and closed CH system. Boiler is on ground floor. The unvented hot water cylinder, water pump and expansion vessels are in the loft. Ground floor CH has two port valve and radio...
  18. 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...
  19. 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...
  20. 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...
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