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center
In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular acceleration. Calculations in mechanics are often simplified when formulated with respect to the center of mass. It is a hypothetical point where the entire mass of an object may be assumed to be concentrated to visualise its motion. In other words, the center of mass is the particle equivalent of a given object for application of Newton's laws of motion.
In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid. The center of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe. In the case of a distribution of separate bodies, such as the planets of the Solar System, the center of mass may not correspond to the position of any individual member of the system.
The center of mass is a useful reference point for calculations in mechanics that involve masses distributed in space, such as the linear and angular momentum of planetary bodies and rigid body dynamics. In orbital mechanics, the equations of motion of planets are formulated as point masses located at the centers of mass. The center of mass frame is an inertial frame in which the center of mass of a system is at rest with respect to the origin of the coordinate system.
Hi, my plumb center wireless room thermostat has stopped displaying heat demand icon when heat is on.
I have changed batteries and completed a re-bind but no luck. I can still turn the heat on ok with thermostat, it's just that the display doesn't tell me I have done so!
Any help would be...
Hi all, I’ve got an issue with no hot water from Center 300L unvented Cylinder on S Plan plus system. All Electrical controls working fine. Only way to get hot water to the taps is by using immersion heater. Any ideas what could be up? Thanks in advance.
Hi All ,
Some advice please ,
We have not had the heating on for a bit but decided to put in back on today for a bit
However when I went to the programmer and peers the Manuel to come on , it wouldn’t come on ?It’s a combi and the hot water is all working ok
Display way showing a triangle...
Hello
I am not a plumber, but we got an issue with our Center EHE0200160 Programmer. It fires up Heating and Water in the morning, but won't automatically switch off (as programmed after some time, and then in the afternoon is the same, somehow it switches itself off after the last ''round'' of...
just figuring out the wiring for combined radiators and underfloor heating.
Zone 1-3 not shown on my sketch but the actuators would kick the valve and pump I'm assuming as its all relays no wiring.
I just need to confirm the addition of the radiator valve.
Apologies for the sketch :)
Hi,
I'm one of the technicians for Derby College building services.
I'm looking out for a balanced flue space heater, fan flued fire, and a DFE for our training area.
If anyone is decommissioning any of the above, donations of them would be greatly appreciated.
Copy & Pasted from Worst Landlord Of 2017 Installs 'Coin Operated Flushing Toilet' In Tenant's Flat - TheLADbible
Didn't hate landlords enough? Well, one power-mad ******* has inserted a coin-operated flushing toilet in one of his tenant's apartment. Talk about throwing your reputation down the...
Who makes thier end feed range? They are reasonably priced, but one end will be tight and needs thing on and the other side is slack!
im going back to yorkshire endex.
Rant over :censored:
(Sorry, reposting...)
Hi chaps,
I was looking at getting Hive Multizone for our central heating and underfloor heating. The underfloor heating will be mostly heatmiser controlled with everything wired into a Heatmiser UH4 wiring center.
I wanted to know if Hive was compatible with this...
Hi chaps,
I was looking at getting Hive Multizone for our central heating and underfloor heating. The underfloor heating will be mostly heatmiser controlled with everything wired into a Heatmiser UH4 wiring center.
I wanted to know if Hive was compatible with this wiring center?
Brand new for April 2016. Launch of boxsets for drilling holes into very hard porcelain tiles.
Two sets have been revamped. The third is completely new.
This boxset is based on our best selling bathroom fitters kit the "All in one solution" A slimline 600g set...
365drills
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Hello Im after some help with a honeywell sundial wiring center. The boiler and pump are permanently on. The cylinder stat was wired incorrectly by the home owner with the common and 2 wires the wrong way round. Having corrected that I am getting 170 volts down the common and 1 wire of the...
My multimeter died last week and im going to need one tomorrow. I remember a thread on here where someone was saying the bloke who does the baxi course swears by the plumb center ones. Which one was it so I can pick one up tomorrow, they do 2, the compact one or the other one....
This one...
Hi,
These pipes are below my bath, and I'd like to fit an isolating valve. The white pipe goes to the tap.
https://www.dropbox.com/sc/ym12jq24mahycuj/AAAlBbbdXDL-8hzed7uMlcQ7a
What parts do I need? I'm going to shop at Plumb Center
Many Thanks.
Ben
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