Video: Cov khoom poob nrawm npaum li cas hauv mph?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nrog huab cua tsis kam ua rau ib qho khoom uas tau poob lawm, lub khoom Nws thiaj li yuav ncav cuag lub davhlau ya nyob twg, uas yog nyob ib ncig ntawm 53 m / s (195 km / h lossis 122). mph ) rau ahuman skydiver.
Hais txog qhov no, puas muaj qhov siab tshaj plaws rau kev poob?
Lub davhlau ya nyob twg tshaj tawm ntawm skydiver nyob rau hauv afree- poob position, lawv nyob qhov twg poob nrog lawv lub plab mus rau lub ntiaj teb yog li 195 km / h (122 mph). Tab sis lawv tuaj yeem nce lawv ceev tremendously los ntawm orienting lawv headtowards lub ntiaj teb - dhia mus rau hauv av.
Ib sab saum toj no, Terminal Velocity ceev npaum li cas? Nyob ruaj khov, plab-rau-lub ntiaj teb txoj hauj lwm, terminalvelocity yog 200 km/h (120 mph). Stable freefall taub hau downposition muaj ib davhlau ya nyob twg ceev 240-290 km / h (kwv yees 150-180 mph). Ntxiv minimization ntawm luag los ntawm streamlining lub cev tso cai rau ceev nyob ze ntawm 500 km / h (310 mph).
Ib yam li ntawd, nws raug nug, dab tsi yog qhov ceev tshaj plaws uas tuaj yeem poob?
Caij nplooj zeeg dawb Speed Terminal velocity yog qhov ceev tshaj plaws ceev uas anobject yuav ncav cuag li nws ntog los ntawm huab cua.
Ib penny puas tuaj yeem tua koj?
Raws li myths xwb, a nyiaj npib poob los ntawm lub tuam tsev Empire State tua tau ib tug hauv qab no. Mythbusterstested nws tawm. Lawv ua rab phom ntawd ua tau hluav taws a nyiaj npib ntawm 64.4 mais ib teev - tib qhov ceev uas a nyiaj npib poob los ntawm sab saum toj ntawm lub teb chaws Ottoman State Building yuav ntaus hauv av ntawm.
Pom zoo:
Vim li cas skydivers ncav cuag qhov nrawm nrawm?
Thaum lub parachute qhib, huab cua tiv thaiv overwhelms lub downward quab yuam ntawm lub ntiajteb txawj nqus. Lub net quab yuam thiab acceleration ntawm lub skydiver ntog yog upward. Lub skydiver yog li qeeb. Raws li qhov ceev txo, tus nqi ntawm huab cua kuj txo mus txog rau thaum ib zaug ntxiv lub skydiver mus txog lub davhlau ya nyob twg tshaj tawm
Vim li cas lub suab mus nrawm dua hauv cov khoom hauv cov kua?
Lub suab mus nrawm dua hauv cov khoom hauv cov kua, thiab sai dua hauv cov kua ntau dua hauv cov pa. Qhov no yog vim qhov ceev ntawm cov khib nyiab siab dua li cov kua uas txhais tau hais tias cov khoom nyob ze ua ke
Cov huab cua tsis kam cuam tshuam li cas rau qhov nrawm ntawm cov khoom poob?
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Koj qhia li cas yog tias daim duab nrawm nrawm lossis qeeb?
Pib: Saib hauv lub sijhawm [0,1]. Txoj hauj lwm (tshem tawm) yog nce, yog li qhov kev tshaj tawm yog qhov zoo. Tab sis daim duab yog concave down, acceleration yog tsis zoo, yam yog qeeb, kom txog thaum nws ncav cuag tshaj tawm (thiab ceev) 0 thaum lub sij hawm 1
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus