Cov txheej txheem:
Video: Qhov chaw ntawm lub cardioid yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nrhiav tus cheeb tsam hauv cov cardioid r = 1 + cos θ. Teb: Cov cardioid yog li lub npe vim nws lub plawv zoo li tus. Siv cov kab txaij radial, qhov txwv ntawm kev sib koom ua ke yog (sab hauv) r ntawm 0 txog 1 + cos θ; (sab nraud) θ ntawm 0 txog 2π. Yog li, cov cheeb tsam yog. 2π 1+cos θ dA = r dr dθ.
Ntxiv mus, koj ua li cas nrhiav thaj tsam ntawm thaj tsam polar?
Lub cheeb tsam ntawm ib cheeb tsam hauv polar coordinates txhais los ntawm qhov sib npaug r = f (θ) nrog α≦θ≦β yog muab los ntawm qhov tseem ceeb A = 1 2 ∫βα[f(θ)] 2 d θ. Txhawm rau nrhiav thaj chaw nruab nrab ob curves nyob rau hauv lub polar coordinate system, ua ntej nrhiav cov ntsiab lus ntawm kev sib tshuam, ces rho tawm cov chaw sib thooj.
Ib tug kuj yuav nug, ua li cas koj integrate Cos 2x? Cov ib qho ntawm cos ( 2x ib ) yog (1/2) sin( 2x ib ) + C, qhov C yog qhov tsis tu ncua.
Ntawm no, dab tsi yog tus qauv rau cheeb tsam hauv qab nkhaus?
Cov cheeb tsam nyob rau hauv ib tug nkhaus nruab nrab ntawm ob lub ntsiab lus yog pom los ntawm kev ua ib qho tseem ceeb ntawm ob lub ntsiab lus. Yuav nrhiav tau thaj tsam hauv qab tus nkhaus y = f(x) nruab nrab ntawm x = a & x = b, integrate y = f(x) nruab nrab ntawm qhov txwv ntawm a thiab b. Qhov no cheeb tsam tuaj yeem suav nrog kev sib koom ua ke nrog cov kev txwv muab.
Yuav ua li cas koj daws parametric equations?
Piv txwv 1:
- Nrhiav ib txheej ntawm parametric sib npaug rau qhov sib npaug y = x2 + 5.
- Muab ib qho ntawm qhov sib txawv sib npaug rau t. (hais x = t).
- Tom qab ntawd, qhov sib npaug muab tau rov sau dua li y = t2 + 5.
- Yog li ntawd, ib txheej ntawm parametric equations yog x = t thiab y = t2 + 5.
Pom zoo:
Dab tsi yog qhov txawv ntawm qhov chaw thiab qhov chaw?
Raws li lub npe qhov txawv ntawm qhov chaw thiab qhov chaw yog qhov chaw yog (tso tseg) kev tu siab, kev tu siab orsite tuaj yeem yog qhov chaw uas txhua yam raug kho; qhov xwm txheej; txoj hauj lwm hauv zos; xws li, qhov chaw ntawm lub nroog los yog ntawm ahouse thaum qhov chaw yog ib qho chaw tshwj xeeb lossis qhov chaw nyob hauv lub cev
Dab tsi yog qhov kev hloov pauv ntawm cov khoom uas txav ntawm qhov chaw mus rau qhov chaw ntawm - 12 m?
Kev piav qhia: Qhov kev txav ntawm ib qho khoom txav ntawm qhov chaw mus rau qhov chaw ntawm − 12 m yog 12 meters. Qhov kev ncua deb ntawm lub hauv paus chiv keeb mus rau qhov siab tshaj plaws txoj hauj lwm yog hu ua displacement ntawm ib yam khoom. Qhov siab tshaj plaws kev hloov pauv ntawm cov khoom nyob rau hauv ib nthwv dej yog hu ua crest thiab qhov tsawg kawg nkaus hloov pauv yog hu ua trough
Lub organelle twg ua haujlwm raws li qhov chaw xa ntawv ntawm lub xov tooj ntawm tes txheeb cov proteins thiab xa lawv mus rau lawv qhov chaw xav tau sab hauv lossis sab nraud ntawm tes?
Golgi Hais txog qhov no, dab tsi organelle yog lub luag haujlwm rau kev thauj mus los? endoplasmic reticulum (ER Qhov thib ob, cov proteins txav mus los ntawm lub cell li cas? Cov proteins txav mus los endomembrane system thiab raug xa tawm los ntawm lub ntsej muag trans ntawm Golgi apparatus nyob rau hauv thauj vesicles uas txav mus los cytoplasm thiab tom qab ntawd fuse nrog plasma membrane tso tawm protein ntau mus rau sab nraum lub cell .
Qhov loj ntawm lub magnetic teb ntawm qhov chaw ntawm lub voj yog dab tsi?
Field ntawm Center of Current Loop B = x 10^ Tesla = Gauss. B = x 10^ Tesla = Gauss. Tam sim no siv rau hauv kev xam saum toj no yog tag nrho tam sim no, yog li rau lub kauj ntawm N lem, tam sim no siv yog Ni qhov twg kuv yog qhov tam sim no muab rau lub kauj. Lub ntiaj teb magnetic teb ntawm qhov chaw yog li 0.5 Gauss
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua