Cov txheej txheem:
Video: Dab tsi yog lub zog rub ntawm lub davhlau ya nyob twg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nws tshwm sim thaum lub sum ntawm cov rub zog (Fd) thiab lub buoyancy yog sib npaug rau downward zog ntawm lub ntiajteb txawj nqus (FG) ua yeeb yam ntawm qhov khoom. Influid dynamics, ib yam khoom yog txav ntawm nws terminal ceev yog hais tias nws ceev yog tas mus li vim lub restraining zog exerted los ntawm cov kua uas nws txav mus.
Kuj kom paub yog, koj ua li cas thiaj nrhiav tau lub davhlau ya nyob twg nrog lub zog rub?
Siv lub tshuab ntsuas qhov nrawm, v = lub hauv paus square ntawm ((2 * m * g) / (ρ * A * C))
- m = loj ntawm cov khoom poob.
- g = qhov acceleration vim lub ntiajteb txawj nqus.
- ρ = qhov ntom ntawm cov kua qhov khoom yog ntog dhau.
- A = qhov projected cheeb tsam ntawm cov khoom.
- C = cov coefficient.
Tsis tas li ntawd, qhov dav dav dav dav ntawm lub pob yog dab tsi? Vim terminal ceev nyob ntawm luag thiab anobject's cross section, tsis muaj leej twg ceev rau terminal ceev . Feem ntau, ib tug neeg poob saum huab cua ntawm lub ntiaj teb mus txog terminal ceev tom qab li 12 vib nas this, uas npog txog 450 meters lossis 1500 ko taw.
Tsis tas li ntawd, qhov kev sib raug zoo ntawm kev quab yuam thiab kev tshaj tawm yog dab tsi?
Luag quab yuam yog proportional rau tus nrawm rau laminar ntws thiab squared nrawm rau turbulent flow. Txawm tias qhov kawg ua rau ntawm ib luag yog viscous txhuam, turbulent luag nyob ywj pheej ntawm viscosity. Luag quab yuam ib txwm txo cov kua dej nrawm kwv tij rau cov khoom khoom nyob rau hauv cov dej txoj kev.
Ib qho piv txwv ntawm kev quab yuam yog dab tsi?
Huab cua kuj yog ib qho piv txwv ntawm luag , yog zog uas cov khoom xav tias thaum lawv txav los ntawm cov kua (kua lossis roj). Zoo ib yam li kinetic kev sib txhuam, rub zog yog reactive vim hais tias nws tsuas yog tshwm sim thaum theobject yog txav thiab nws taw qhia nyob rau hauv lub opposite kev taw qhia rau theobject qhov kev txav los ntawm cov kua.
Pom zoo:
Dab tsi yog qhov davhlau ya nyob twg tshaj tawm ntawm skydiver?
Txog 200 km / h
Tus nqi ntawm lub davhlau ya nyob twg yog dab tsi?
Raws li cov cua tsis kam, piv txwv li, lub davhlau ya nyob twg ceev ntawm lub skydiver nyob rau hauv lub plab-rau-lub ntiaj teb (piv txwv li, fim down) free caij nplooj zeeg txoj hauj lwm yog hais txog 195 km / h (120 mph; 54 m / s)
Dab tsi yog qhov hluav taws xob davhlau ya nyob twg?
Lub davhlau ya nyob twg yog qhov taw tes uas tus neeg xyuas pib los ntawm cov khoom siv, cov khoom siv lossis lub network los txog qhov kawg. Hauv kev tsom xam network (hluav taws xob circuits), lub davhlau ya nyob twg txhais tau hais tias lub ntsiab lus ntawm kev sib txuas tuaj yeem ua rau lub network hauv txoj kev xav thiab tsis tas yuav xa mus rau ib qho khoom siv lub cev
Dab tsi yog qhov txawv ntawm lub zog siv zog thiab lub zog thauj khoom?
Raws li nrog cov dav hlau inclined, cov khoom yuav tsum tau txav mus los yog lub zog muaj zog los yog thauj khoom thiab kev siv zog yog lub zog muab tso rau hauv kev txav mus los ntawm lwm qhov kawg ntawm lub fulcrum
Dab tsi yog cov qauv ntawm lub zog nyob rau hauv lub peev xwm thiab lub zog kinetic?
Lub zog muaj peev xwm yog khaws cia lub zog thiab lub zog ntawm txoj haujlwm - lub zog gravitational. Muaj ntau hom kev muaj peev xwm muaj zog. Kinetic zog yog kev txav - ntawm nthwv dej, electrons, atoms, molecules, tshuaj, thiab khoom. Chemical Zog yog lub zog khaws cia hauv cov khoom sib txuas ntawm atoms thiab molecules