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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.
M&P Shield Plus Performance Center, 4" model, with three 13 round magazines, Vedder holster, and Vedder mag carrier. I bought it from a member on here last year. However, it was another impulse buy of mine. The pistol does not fit any role for me as I already have a backup carry and a lazy...
Selling my compass in 6.5 creedmoor
Rife is stock except muzzle brake and bipod
Nothing wrong with the rifle.
I don’t shoot 6.5 any more
$250 firm
503-706-6617
I’m located in Hillsboro
And would prefer to meet no more then 20 min away.
Performance Series features a ported Barrel, Hi-Vis front and rear sights, performance center trigger. This one has a manual safety, no slide cut. Comes with one 8 round and one 7 round magazines, Talon grip tape. I have fired around 400 rounds through it. I bought new in 2015 and have not...
Originally for Journey/Billy Idol, but Toto replaced Billy Idol, which is the reason I’m selling these. Two tickets, section 302, row H, seats 1&2. $150 for the pair or will trade for one ticket of equivalent value to Roger Waters at the Moda Center in September. I can do the transfer of tickets...
I have a very nice TC Encore package here.
MGM stainless 27” fluted barrel in 338-06 Ackley Improved. The second blued Encore 26” barrel is in 6mm Remington. 338 barrel has a nice Leupold 2-7x scope and the 6mm Rem barrel has a Vortex Crossfire 4-12x.
All in excellent shape and shot very...
Turning 50 this year, wife wants to get me something I want "FINALLY" Always wanted a 30-30 or bigger lever action. What can you part with to make my life complete???
S&W 1911 PC .425" barrel
These 1911s come with much more bang for your buck than most.
Look up the specs at S&W for all of the upgrades.
But these are from the performance center which is their custom shop.
Briley Bushing and matched barrel
Ported Slide
Adjustable Trigger
Polished Feed Ramp...
Lightly used Smith and Wesson Performance Center M&P Pro Series CORE 9mm. This is the long slide 5" barrel version that is optics ready, included is a Vortex Venom mounted.
Has suppressor height sights for co-witnessing.
Originally purchased for my girlfriend but she just never got into it...
It...
I've got a s&w mp shield performance center in 9mm. Ported barrel and slide. Upgraded trigger kit. HI-VIZ Fiber Optic Sights. Only been shot a handful of times. It just sits in the safe. Been out of work with covid need some cash so I'm thinning the herd. Comes with 2 mags full price gets 50rd...
It's coming up on 2 months since I've had this gun only has been taken to the range a maximum of 3 times with a total of less than 400 rounds through it. It has been very well taken care of, cleaned it after every trip. And it has been cleaned recently to be put up for sale. Why am I selling it...
25 rounds down range with this one. It's basically brand new, includes everything you see in the pictures. It currently has the night night sights on it but will include the factory fiber optic sights.
Not much to say about it, it's completely stock. Prefer FFL transfer near Wilsonville or...
S&W 2021 Shield plus performance center 9mm. New subcompact double stack has fiber optic sights performance center tuned trigger and barrel and slide ports 2 mags one flush one plus 2. New in box unfired. $399 extremely firm on price.
This scope came with a used 10/22. Has a red/green option for the reticle, which apparently I left on because the battery is dead, but it worked last time I checked. I used it once or twice successfully, until it was replaced. Includes the flip caps and pic mounts. I do not know what the...
Hi, I'm new to Oregon, moved from center Florida across the country to Portland. Good to see everybody here and happy to join the discussion. Brief self-introduction, I'm a long-range shooter, ammo reloader, partner with an FFL/SOT, and of course firearm collector/enthusiast. Hope to get advice...