Javascript is currently disabled. This site requires Javascript to function correctly. Please enable Javascript in your browser!

معرفی دستگاه های مرکز

DnnForge - NewsArticles

14

صندلی چرخان

صندلی چرخان
در صندلی چرخان شخصی روی یک صندلی که آزادانه حول محور قایمی می چرخد نشسته، در حالیکه دو وزنه کیلوگرمی که بر روی میله ریل داری به صورت متقارن در دو طرف شخص قرار گرفته را نگه می دارد. شخص دیگری صندلی را با سرعت زاویه ای معینی می چرخاند، با فرض ناچیز بودن اصطکاک هیچ گشتاور نیرویی نسبت به محور قایم تولید نمی شود. تنها نیروی خارجی که به سیستم صندلی و شخص و وزنه ها وارد می شود نیروی گرانش است که چون هیچ مولفه ای در صفحۀ عمود بر محور چرخش ندارد بنابراین هیچ گشتاور نیرویی نسبت به محور دوران تولید نمی کند. بنابراین تکانۀ زاویه ای نسبت به این محور پایسته است، یعنی:
 
که مربوط به زمانی است که وزنه ها در بیشترین فاصله نسبت به محور دوران قرار دارند و چون داریم:
 
در این حالت بیشترین مقدار را دارد در نتیجه نیز بیشترین مقدار را برای سیستم ( شخص و صندلی و وزنه ها) دارد مربوط به زمانی است که وزنه ها در کمترین فاصله نسبت به محور اصلی دوران قرار دارند. بنابراین و الزاماً برای اینکه باشد باید باشد. 
پس بدون اعمال نیروی خارجی وقتی وزنه ها به سمت محور اصلی دوران نزدیک می شوند سرعت زاویه ای سیستم افزایش می یابد.
رابطۀ در حرکت دورانی نظیر رابطه ای است در حرکت خطی که در آن نقش جرم اینرسی،  نقش سرعت خطی و نقش تکانۀ خطی در حرکت خطی را دارد.

کاربردهای این قانون:
در ورزش پاتیناژ، ورزشکار در هنگام چرخش با جمع و باز نمودن دستهای خود سرعت زاویه ای خود را بدون اعمال نیرویی به ترتیب افزایش و کاهش می دهد. شیرجه روها، ورزشکاران باستانی و اسکیت بازان روی یخ غالباً از این اصل استفاده می نمایند.
روش استفاده:
بر روی صندلی نشسته و پاهای  خود را بر روی پدالها بگذارید. بازوهای دستگاه را ببندید و دو جرم را در دست بگیرید، دو جرم را در انتهای بازوها قرار دهید. صندلی را بچرخانید (از همراه خود کمک بگیرید) سعی کنید در حین چرخش جرمها را به خود نزدیک کنید. مشاهده می کنید با بستن جرمها سرعت چرخش افزایش و با باز کردن جرمها (دور کردن از خود) سرعت چرخش کاهش می یابد.

تعداد امتیازات: (11) Article Rating
تعداد مشاهده خبر: (3992)
کد خبر: 2560
  • صندلی چرخان

RSS comment feed نظرات ارسال شده

8
# ubcfellowship (پنج شنبه 10 آبان 1397 01:06 ب.ظ)
nike free 3.0 v2 kvinders lilla parajumpers coat men undergarments hermes scarf label the hermes scarf prada sunglasses spr 59s christian louboutin shoes 2011 quote
ubcfellowship http://www.ubcfellowship.com/
17
# emporiodobolo (جمعه 11 آبان 1397 01:52 ق.ظ)
hermes accordion scarf white converse hugo boss burgundy tie prada sunglasses all models tory burch april rain boots mackage white wool coat
emporiodobolo http://www.emporiodobolo.com/
22
# reinigungbern (جمعه 11 آبان 1397 05:20 ق.ظ)
reggie ragland buffalo bills jersey nike shox r4 mens silver red
reinigungbern http://www.reinigungbern.com/
31
# kokismith (شنبه 12 آبان 1397 12:30 ب.ظ)
nike hat canada air jordan 7 raptor 2002
kokismith http://www.kokismith.com/
35
# dystopianflix (شنبه 12 آبان 1397 01:10 ب.ظ)
ray ban shooting glasses yellow 3ds prada diaper bag price mackage messenger laptop cardy sweater ugg boots size 65 hermes belt new balance 1500 wr
dystopianflix http://www.dystopianflix.com/
37
46
55
# swellvelo (يکشنبه 13 آبان 1397 08:17 ق.ظ)
mennns nike air max 90 hvit boys burberry tie hermes scarf elephant nobis the rosco nike flyknit lunar 2 mens orange blue hermes pop h earrings price
swellvelo http://www.swellvelo.com/
78
79
# guntruther (دوشنبه 14 آبان 1397 11:38 ق.ظ)
black and gold hermes belt womens nike kobe 12 orange germany
guntruther http://www.guntruther.com/
82
# WQ (دوشنبه 14 آبان 1397 05:24 ب.ظ)

pan and the north face box brake, as burberry outlet online well as magnetic michael kors purses bending gsw jerseys machine lunette oakley pas cher for...Sheet gafas oakley metal mcm bags machine ferragamo shoes includes burberry handbags pan roche run brake machine, bcbg dresses hydraulic philadelphia 76ers jersey shear machine, rolling air max 2014 machine, oakley outlet online and lunette ray ban pas cher hydraulic press coach factory outlet online brake converse machine.Aug michael kors outlet online sale 8, 2016 ... burberry sale cnc milwaukee bucks bending services, true religion cnc reebok shoes bending nfl jerseys outlet solutions, mont blanc pens precision sheet metal components, .... san antonio spurs cnc nfl saints milling cheap basketball shoes machine, bending salvatore ferragamo device, burberry outlet online hot marc jacobs outlet air ralph lauren uk universal coach outlet online oven huaraches memmert supra shoes .... chip conveyor, replica handbags engine new balance shoes trolley, magnetic separator, magnetic hogan coolant...IRON parajumpers outlet online WORKERS · MAGNETIC DRILLS tods mens shoes .... stone island store All air jordan retro Fabrication Machinery rayban services the north face pas cher metal fabrication industry swarovski in prada handbags Western ugg Canada. ... louboutin end nike free shoes precision air jordan shoes sheet metal cheap oakley bending, punching and zapatillas nike laser cutting air max shoes applications, nfl cowboys the HGG line ralph lauren of hermes bags CNC ... the mcm outlet VOORTMAN line minnesota timberwolves of structural uggs steel coach bags and north face plate processing equipment among many dsquared2 shoes others.A brake cheap oakley press is fidget spinner also sometimes mizuno running called tommy hilfiger a “bending guess jeans machine”. ..... Press rayban sunglasses brakes are standard nop jerseys machines used nike free run for sheet nike mercurial vapor metal louboutin processing. ... armani clothing Withpan and tory burch shoes box adidas shoes brake, free running as well pandora rings as magnetic bending machine cheap true religion for...Sheet ralph lauren outlet online metal polo ralph lauren outlet machine fred perry includes ralph lauren pan brake nfl eagles machine, hydraulic adidas shear michael kors australia machine, air max 95 rolling machine, nike huaraches and hydraulic press flat iron brake coach outlet machine.Aug jerseys from china 8, ray bans 2016 nike store ... cnc bending iphone 4s cases services, cnc bending solutions, precision nfl seahawks sheet true religion jeans women metal polo ralph lauren components, ralph lauren .... nike outlet store cnc coach purses milling machine, tommy hilfiger bending michael kors canada device, hot air puma universal oven memmert kate spade outlet online .... chip conveyor, coach outlet engine nfl jerseys trolley, indiana pacers magnetic separator, magnetic coolant...IRON vans schuhe WORKERS ray ban sunglasses · MAGNETIC marc jacobs handbags DRILLS adidas shoes outlet .... All replica watches Fabrication timberland outlet Machinery ray ban zonnebril services knicks jerseys the christian louboutin shoes metal fabrication industry nfl browns in kobe bryant jersey Western skechers womens shoes Canada. ... end c&c beanies wholesale precision chrome hearts jewelry sheet metal bending, timberland homme punching long champ and nfl bears laser cutting longchamp outlet applications, nfl azcardinals the kanye west shoes HGG new balance store line nike max of philipp plein clothes CNC ... the VOORTMAN giuseppe shoes line air max of nike.se structural asics steel mbt shoes outlet and plate processing air jordans equipment jerseys from china among many nfl packers others.A designer handbags brake burberry handbags press los angeles clippers is also christian louboutin sometimes salvatore ferragamo called a bottega veneta “bending machine”. thomas sabo ..... Press nfl giants brakes oakley outlet are standard nfl chiefs machines soccer outlet online used for sheet ralph lauren outlet metal processing. nike roshe ... nike mercurial Withpan shoes on sale and box brake, as cleveland cavaliers jerseys well lacoste polos as magnetic bending ralph lauren polo machine prada outlet for...Sheet metal machine includes cheap michael kors pan coach factory outlet online brake ralph lauren shirts machine, hydraulic toronto raptors shear machine, polo outlet online rolling machine, oakley sunglasses outlet and hilfiger outlet hydraulic givenchy bags outlet press nfl redskins brake machine.Aug iphone 5 cases 8, 2016 burberry ... cnc bending air jordan services, nfl bills cnc longchamp bending belstaff mens jackets solutions, precision sheet metal nfl patriots components, nike air .... barbour outlet cnc Hermes milling ralph lauren uk machine, woolrich outlet online bending device, hot ugg australia air the north face universal oven memmert .... pandora bracelets chip moncler women jackets conveyor, pistons jersey engine dallas mavericks jersey trolley, barbour women jackets magnetic mcm bags separator, magnetic nfl falcons coolant...IRON coach outlet WORKERS · scarpe hogan MAGNETIC DRILLS nba jerseys outlet .... cheap michael kors All coach factory outlet online Fabrication Machinery mcm backpack outlet services soccer shoes the metal the north face fabrication industry in Western uggs Canada. oakley sunglasses outlet ... beats by dre end precision cheap jerseys sheet cheap oakley sunglasses metal bending, punching nike huarache and tory burch shoes laser adidas.se cutting kate spade applications, the lacoste shirts HGG line rayban of CNC ... ray ban sbocco the portland trail blazers VOORTMAN new balance line of pandora structural cheap nike shoes steel and plate processing roshes equipment among many others.A brake mia jersey press nfl 49ers is burberry outlet also nike air max sometimes coach outlet en ligne called nike.com a “bending nfl rams machine”. wholesale handbags ..... Press brakes dansko shoes are standard nike free 5.0 machines barbour mens jackets used ecco women shoes for fred perry shoes sheet nfl buccaneers metal ray ban sunglasses outlet processing. ... Withpan and calvin klein box asics gel brake, jordans for sale as michaelkors.com well as ferragamo magnetic michael kors outlet bending machine roshe run for...Sheet metal machine adidas superstar includes jordan shoes pan brake new balance machine, cheap jerseys hydraulic kate spade outlet shear machine, prada rolling machine, and houston rockets hydraulic belstaff sale press giuseppe zanotti brake machine.Aug utah jazz 8, 2016 uggs ... timberland shoes cnc bending pandora services, cnc bending michael kors purses solutions, air max precision nba jerseys sheet metal components, .... ferragamo outlet cnc skechers milling machine, nike outlet bending adidas neo device, hot air nfl chargers universal michael kors v?skor oven tommy hilfiger online shop memmert levi's jeans .... coach factory outlet online chip nba jerseys outlet conveyor, moncler outlet online engine cheap oakley sunglasses trolley, magnetic separator, magnetic denver nuggets coolant...IRON WORKERS · MAGNETIC nfl ravens DRILLS vans outlet online .... kevin durant shoes All polo ralph lauren outlet online Fabrication Machinery polo ralph lauren outlet services uhren the metal hermes birkin fabrication michael kors industry converse shoes in hilfiger Western asics Canada. nfl broncos ... end jack wolfskin outlet online precision bottega sheet metal orlando magic bending, punching burberry and laser tory burch sale cutting applications, the HGG longchamp line jimmy choo shoes of CNC ... converse outlet the michael kors VOORTMAN line cheap glasses of ray ban sunglasses structural steel and oakley plate north face outlet processing equipment among valentino shoes outlet many russell westbrook jersey others.A brake longchamp taschen press nba jerseys is hogan shoes outlet also north face backpacks sometimes nike roshe called a thomas sabo “bending sac jerseys machine”. ..... Press brakes jack wolfskin are standard nike air max machines ed hardy clothing used prada outlet for cheap eyeglasses sheet suns jerseys metal processing. cheap jerseys ... Withpan and box charlotte hornets jersey brake, fitflop as nike air force well as magnetic bending salomon schuhe machine michael kors outlet online for...Sheet metal hermes outlet machine nike online includes pan nfl bengals brake machine, hydraulic polo ralph lauren shear machine, rolling mont blanc machine, nike air max 2014 and true religion jeans outlet hydraulic juicy couture press nike air max 2015 brake plein outlet machine.Aug nfl vikings 8, babyliss 2016 polo ralph lauren ... cnc bending burberry uk services, cnc bending memphis grizzlies solutions, adidas.de precision sheet michaelkors.com metal components, .... ugg australia cnc bos jersey milling machine, fendi outlet online bending jimmy choo device, oakley prescription hot air pandora universal northface oven memmert air max 90 .... nfl panthers chip conveyor, ray ban sunglasses engine trolley, magnetic www.tommyhilfiger.nl separator, reebok magnetic links of london bracelets coolant...IRON WORKERS · MAGNETIC michael kors outlet online sale DRILLS levis outlet store .... All Fabrication ray ban Machinery juicy couture clothings services katespade outlet the beats audio metal ray ban outlet fabrication nfl dolphins industry nike.de in ray ban sunglasses Western ralph lauren outlet Canada. ... nike air force end nfl lions precision sheet metal burberry online shop bending, chicago bulls punching and hugo boss outlet laser jerseys from china cutting nfl texans applications, softball bats the belstaff HGG line louboutin shoes of CNC michael kors handbags ... baseball jerseys the VOORTMAN nets jersey line guciheaven of structural steel and plate ugg processing equipment michael kors among bcbg max azria many others.A michael kors bags brake red bottoms press coach black friday is nfl jets also sometimes called a “bending vans outlet machine”. ..... Press burberry outlet online brakes ray ban are standard roshe run machines used under armour curry for sheet metal supra footwear processing. occhiali oakley ... Withpan vans shoes and nike air max box nfl steelers brake, the north face outlet as polo ralph well nike air max as true religion outlet magnetic bending machine for...Sheet michael kors outlet online metal adidas sneakers machine includes pan brake mcm handbags machine, swarovski crystal hydraulic barbour mens jackets shear ray ban sunglasses outlet machine, rolling washington wizards machine, nfl jaguars and christian louboutin hydraulic press burberry handbags brake machine.Aug 8, nike air 2016 ... cnc bending services, new balance cnc nike tn requin bending nfl raiders solutions, michael kors purses precision sheet prada sunglasses metal michael kors bags components, oakley .... michael kors bags cnc dre beats milling skechers machine, nba jerseys bending vibram shoes device, coach factory online hot coach outlet sale air michael kors outlet online universal free run oven pandora jewellery memmert barbour women jackets .... chip conveyor, engine trolley, magnetic separator, magnetic ralph lauren coolant...IRON WORKERS coach outlet online · nike.dk MAGNETIC DRILLS tommy hilfiger outlet stores .... jordan release dates All mizuno running shoes Fabrication Machinery services the dsquared2 jeans metal fabrication industry in Western Canada. ... end coach outlet precision sheet louboutin outlet metal cheap jerseys bending, punching and laser cutting puma outlet store applications, the HGG line nfl titans of CNC ... the VOORTMAN versace shoes outlet line tory burch sandals of structural guess bags outlet steel swarovski and plate processing equipment among many swarovski others.A brake converse chucks press oakley sunglasses is also ralph lauren online sometimes called a cheap true religion “bending michael kors handbags machine”. ralph lauren factory store ..... under armour ua shoes Press ray ban wayfarer brakes nfl colts are standard machines used swarovski jewelry for versace outlet sheet metal timberland boots processing. cheap oakley sunglasses ... With

88
# new york yankees cap fashion go (سه شنبه 15 آبان 1397 02:07 ق.ظ)
nike running 2018 black green shoes canada,air jordan 10 retro blue black shoes,adidas x 16.1 shoes black gold shoes for cheap,shoes nike elastico pro iii blue yellow shoes
new york yankees cap fashion go http://www.ftmyerscleaning.com/new-york-yankees-cap-fashion-go-Costa_de
92
# seansinjin (سه شنبه 15 آبان 1397 04:23 ق.ظ)
fendi peekaboo bag review prada sunglasses studs nike hypervenom 2 phelon fg prada cheetah wallet shiny black moncler coat north face denali down womens
seansinjin http://www.seansinjin.com/
93
# opticgambetta (سه شنبه 15 آبان 1397 12:37 ب.ظ)
gold metallic ugg boots versace belt sizes nike air max 1 red and grey hermes jewelry bracelet new balance 410 black sonic sneakers louboutin long boots
opticgambetta http://www.opticgambetta.com/
95
# sandeneuhofer (سه شنبه 15 آبان 1397 09:22 ب.ظ)
mackage sade leather jacket cheap air max 90 ultra nike air max ltd herre guld nike kobe 10 green basketball shoe mackage chloe coat black nike hyperdunk black and blue
sandeneuhofer http://www.sandeneuhofer.com/
99
# salecarvao (چهارشنبه 16 آبان 1397 12:43 ق.ظ)
san antonio spurs bobble hat new balance basketball shoes 4e air jordan 10 size 15 new york knicks d rose jersey burgundy burberry tie fendi small wallet
salecarvao http://www.salecarvao.com/
101
# honestmentor (چهارشنبه 16 آبان 1397 01:11 ق.ظ)
womens nike kobe 12 orange germany ugg classic short navy adidas adipure 11pro white blue lebron 12 march 2015 release miami beach hat nike shox deliver mens black grey
honestmentor http://www.honestmentor.com/
113
# exetervanhire (چهارشنبه 16 آبان 1397 04:59 ق.ظ)
nike kobe mamba day air jordan 10 retro power blue boy nike air max 1 lunar id psg nike sb blazer high hommes gris yeezy boost 350 v2 for sale dubai mackage leather coat
exetervanhire http://www.exetervanhire.com/

ارسال نظر جدید

نام

ایمیل

وب سایت

تهران، میدان قدس، خیابان شهید کبیری (دزاشیب)، خیابان عمار، کوی شهید صالحی(عرفات)، شماره 22، مرکز علوم و ستاره شناسی تهران
 96027012 (تلفن مرکز)

96027659 (بازدید)

96027653 (آموزش)

96027657 (روابط عمومی)
info@sactehran.com

مرکز علوم و ستاره شناسی تهران وابسته به معاونت اجتماعی و فرهنگی شهرداری منطقه یک تهران، با هدف آشنایی دانش آموزان، دانشجویان، دانش پژوهان و عموم مردم با علوم پایه، پایه گذاری شده و دانش پژوهان و دانشجویان بسیاری در این مجموعه حضور فعال و کارآمد دارند. این مرکر سالانه میزبان هزاران نفر از علاقه مندان در زمینه های مختلف علمی و نجومی می باشد.
Asset 1 Asset 2 Asset 3