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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. L

    Slow leak from pipe in airing cupboard

    Hey all, I have a bit of a leak in a pipe between the pump and thermostat in my airing cupboard. I'm due to ring a plumber I've been given a number for but does anyone know if this is a quick job to fix and how much it might be? I assume it's a straight forward replacement of pipe? Thanks Liz
  2. G

    Slow running hot water

    I hope someone can help with this. The hot taps in our bathroom (sink and bath) both have a similar problem (bath is worse than sink). Our water is heated by a combi boiler. When the taps are first turned on, and the cold water from the pipes is running through they flow fine, but as the hot...
  3. D

    Slow flowing CH

    Hi Guys A customer called me out this week after having just turned on their CH, usual story rads not too hot. I've bled them and released a lot of air which did the trick, but not for long. The pump is working fine, The rads nearest the HW cylinder are constantly hot but as i follow them down...
  4. G

    Baxi 105e working OK but slow running scalding water

    Hi all hope you can help me, I've got a Baxi 105e which has been running great until lately. The hot water started running really slow and the pressure started to constantly drop. With investigation I found it needed a new expantion vessel. I fitted an external tank successfully but still...
  5. U

    Baxi 80e combi - Very slow to fire up

    Hi everyone I'm just after some advise about the fault I have with my boiler. The boiler is taking over 5 minutes to fire up no matter which function is selected ie water only or water and heating. Today an engineer has replaced the diaphragm, which did need replacing anyway and there is no...
  6. P

    Slow forum - need help

    I'm having trouble with this forum and the tilers forum, they are soooo slow at loading and its becoming a real pain. If I click on a thread, the page loads in the normal time but I cant scroll down until it say 'done' at the bottom left of the screen and there is a small green progress bar...
  7. Z

    slow filling cold water tank

    Hi, I am new to this so bear with me. I have a problem with the cold water supply to my tank in the loft, the water coming into the house normally and the kitchen sink is in full flow but somehow between there and the tank it slows to a mere trickle and we are using the water before the tank...
  8. S

    Toilet slow to flush

    Hi all, Got a w/c that seems really slow to flush. When flushing water pressure not great but still get a bad smell after flushing and slow to drain. Does this sound like diaphragm change AND perhaps an obstruction? Gubbins inside cistern seem your average type, flush valve and inlet. What...
  9. T

    Slow work?

    What does everyone do once it goes a but quiet in the work front? Any other work or jobs ?
  10. M

    Roca Thesis basin mixer - slow flow rate

    Hi, I have just had a Roca Thesis basin mixer installed and I'm not convinced that the flow rate is what it should be. It's not a trickle but given my hot water system is unvented main pressure, I would have expected much better. Does the flow rate decrease dramatically with the use of...
  11. T

    Slow flowing kitchen tap

    I have a slight problem with a monobloc tap in the kitchen! The hot tap is stiff to turn and when it is tuned takes more of a turn to let water flow than the cold. Also the water has a poor flow rate! Am I right in sayin the tap needs re-seating or shud i just replace it?
  12. N

    Slow WC Problem

    I am working on a WC draining through a horizontal soil pipe (about 10 ft with 1" fall can't get any greater than this due to shallow floor joists) this then exits into a vertical stack. There are no blockages and air is entering stack. My problem is a that the WC fills almost to the rim before...
  13. P

    ktichen tap - slow start

    I have a mixer tap in the kitchen and there is a problem in that when I turn on the hot tap (quarter turn valve) there is often up to a 15 second delay before any water comes out. There is no problem with the mains cold and the hot is fed from the cylinder which is upstairs and about 12 feet...
  14. T

    Toilet cistern slow to refill + loft water tank making noises / empty?

    Hi there I live in a single-floor maisonette with a loft. In the loft is our water tank. My toilet is taking an exceptionally long time to fill - I move the ball up and down and it doesn't seem to have any real effect on the amount of water coming into the cistern. My water tank is...
  15. J

    Cylinder slow to heat

    We have installed a unvented system at 1600mtrs high in the alps,we have an lpg system boiler, a 300 litre cylinder, underfloor heating. The cylinder heats pretty quickly to 50deg then takes about an hour to heat the last 10 deg to 60deg,i suspect the incoming cold water is colder than normal at...
  16. A

    Slow draining shower

    :) I have a shower 5yrs, :( recently it has been slow draining. The hunter pvc Compact shower trap is the original. I have removed the grid/trap and viewed the main body but cannot see any outlet! :confused: Am I missing something, I have tried to clear from outside but no success. What can I...
  17. P

    slow heating rads on 10mm

    Some people say that 10mm pipe is better for central heating systems but I find that it makes them very inefficient as the radiators take a very long time to fill up with such a narrow bore and therefore become less efficient as the boiler is still on full no matter how quick the rads are...
  18. S

    Slow start for hot water in mixer

    Hi All I've just changed my separate bathroom taps for a mixer. The HW is gravity fed and the cold is mains so I guess I could have expected problems... But actually it works OK, except for one thing. When I first turn the hot on, sometimes I need to wait for ages (several minutes) before...
  19. J

    Shower/mixer tap - slow flow

    Hi, I have a a shower/mier tap set which I bought from Homebase and had fitted by a plumber about 2 years ago (Chrome Victorian Bath/Shower Mixer > on their website). The hot water tap is running very slowly, almost a dribble. Other hot taps in my house are running OK, so I assume it is...
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