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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.
Lightly used 9mm performance center, 3 mags and two holsters ISW and OSW. Buyer pays for transfer.
Ported barrel to reduce muzzle flip
• Lightening cuts in slide for reduced weight
• PC flat face, silver anodized aluminum trigger
• PC enhanced silver anodized aluminum grip safety
• PC ported...
Perfect condition, I've put 150 rounds through it.
Performance center model has high visibility fiber optic sights and a ported barrel.
Comes with a Braids fitted leather RH IWB holster, 1 6rd mag, 1 7rd mag.
Comes with some personal defense ammunition.
$550 obo or trade for a Glock 23 in...
$500
27" barrel
Very nice condition, I bought it from a friend a couple years ago, who bought it new, he said he only used it a couple times, always cleaned and put away properly.
45 cal, brass trimmings, patch box has a jag inside.
Any trade needs at least $200 cash in wth the trades...
I picked up some 140 gr 6.5c ammo and wow this stuff is el poopoooo ! There was 5 duds in one box and a definite difference in charges out of a sub moa rifle produced pie plate groups ! I would avoid at all costs tried to call manufacturer for the past three days and no answer and no reply to e...
I am looking for a Thompson center 22 (their 10/22 clone) with the rail and peep sight. Please let me know what you have and send a price (I prefer not to haggle if your price is fair, worst I can say is no thank you). I figured I'd check here before buying a new one.
Up for sale is a lightly used (approx. 200 rounds) Jerry Miculek Smith & Wesson 929 9mm Performance Center Revolver. I bought this gun from the original owner when I thought I was going to try USPSA Revolver Class competition. Work, life and other firearm interests got in the way and the 929...
Real nice older model T.C. Hawken. Is in really good condition and everything functions as it should. Bore is good. $425 within 50 miles of Roseburg. NO FFL needed. And if you pick it up local i will throw in a pound of powder and some round balls.
So, tentative plans to head to Portlandia very soon. Mainly just wish to try a venue some friends raved about. Can anyone recommend a good hotel, roughly, in the area of the World Trade Center? I see several hotels in the general area, but don't know much about them.
Thanks!
Thompson center compass in 6.5 creedmore, new unfired, new Leupold freedom 3-9x40 optic, new muzzle brake, bore sighted only, with boxs. $550, . text or call 503-586-6162 for pics and details.
Selling what I am told and believe to be an unfired T/C Renegade 50 Cal percussion rifle. Its in amazing shape, a 9.5/10 easily. The gentleman I got it from said he bought it, and a hawken new years ago and never shot either of them. He removed (and lost) the nipple during storage so it will...
Selling a very nice Hawken flintlock 50cal, very clean with some minor marks from age and light use, bore is bright and shiny, nipple is clean and the lock looks and works perfectly.
This has a Pre Warning barrel and the 3 hole tang for a vernier sight.
Does not require an FFL
asking 575...
I purchased this beauty in early 2019 and am the only owner. A wild guess but < 1K rounds of .38 special fired. Revolver is 100% stock and has all of the goodies from the factory including three moon clips. Absolutely NO nicks, dings or scratches. If photos show imperfections, it is entirely...
6 BOXES, NOS WESTERN SUPER-MATCH 38 SPECIAL MID-RANGE MATCH 148 GR. LEAD CLEAN CUTTING CENTER FIRE CARTRIDGES - 300 ROUNDS
PORTLAND/VANCOUVER METRO ARE ONLY. WILL NOT SHIP
Hi, I am looking for a center pin for my 922. I have included pics of the serial number and gun. I believe it is a 1954 model with a serial beginning with "M" Thanks
7-shot .357 Magnum performance center L-frame with integral compensator and tritium front sight. Comes with VZ grips, hard case, and a handful of TK Custom moon clips. I will include a BMT Mooner moon clip loading and unloading tool for the right deal.
Trading for:
-New generation of 4.25"...
For sale is a used Performance Center model 19 Carry Comp.
3 inch Ported Barrel with Front Night sight and adjustable rear.
beautiful factory supplied wood grips. Also comes with a set of standard rubber grips.
Performance Center enhanced trigger.
6 rounds cylinder.
I purchased this gun used...
I have a Thompson Center black powder rifle. It is missing parts. I know nothing about these rifles. I have no use for this, and it’s just been sitting in my safe. Would like to trade for something different. Open to many things just shoot me your offer.
Im not wanting to ship it at this time...