Video: Qhov kev daws teeb meem ntawm lub stopwatch yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev daws teeb meem muaj feem xyuam rau tus lej ntawm tus lej ntawm lub cuab yeej tso saib rau digital stopwatch , los yog qhov tsawg tshaj plaws increment los yog kawm tiav ntawm lub ntsej muag ntawm ib tug analog stopwatch . Piv txwv li, yog tias a stopwatch zaub qhia ob tug lej rau sab xis ntawm tus lej lej, nws muaj a daws teeb meem ntawm 0.01 s (10 ms, lossis 1/100 ntawm ib thib ob).
Ua raws li qhov no hauv kev txiav txim siab, dab tsi yog qhov tsis paub tseeb ntawm lub moos nres?
Xyaum ib qho kev ntsuas ua nrog manually ua stopwatch yuav tsum tau muab ib qho tsis paub meej ntawm +/- 0.2 thib ob es tsis yog +/- 0.01 vib nas this qhov ntsuas muaj peev xwm.
Dab tsi yog qhov tseeb dua li lub stopwatch? meej kev ntsuas tsis zoo ib yam li raug kev ntsuas. Ib raug Kev ntsuas yog "yog" thiab pom zoo nrog kev tshawb xav. Yog li, koj txiav txim siab kom tau ib qho muaj tseeb dua stopwatch . Koj khiav koj tus dev tsib ntau sij hawm, thiab tau txais cov sij hawm nram qab no nrog koj cov tshiab stopwatch 2.000, 2.002, 2.003, 2.004, thiab 2.002 feeb.
Tsis tas li ntawd, dab tsi yog qhov kev nyeem ntawv raug ntawm lub stopwatch?
Cov nyeem ntawv muab lub sijhawm ncua sijhawm. Qee leej watches nres tau txuas nrog hluav taws xob rau lub sijhawm tshwm sim thiab yog li, ntau dua. Qhov tseeb : ± 0.1s. (Cov nyiaj pub dawb rau tib neeg lub sijhawm tshuaj tiv thaiv txwv lub sijhawm raug ntawm stopwatch mus rau 0.1 - 0.4 s rau kev sim kuaj.
Dab tsi yog qhov tsis paub meej rau tus kav?
Tus kav A muaj ib tsis paub meej ntawm ± 0.1 cm, thiab Tus kav B muaj ib tsis paub meej ± 0.05 hli Yog li ntawd, (a) Tus kav A tuaj yeem muab qhov ntsuas 2.0 cm thiab 2.5 cm. (b) Tus kav B tuaj yeem muab qhov ntsuas 3.35 cm thiab 3.50 cm. Daim duab 2.2 Metric Cov thawj coj rau ntsuas Length On Tus kav A, txhua qhov kev faib yog 1 cm.
Pom zoo:
Cov txheej txheem ntawm kev tsim cov kev daws teeb meem yog dab tsi?
Kev daws yog tsim thaum ib yam khoom hu ua thesolute 'dissolves' rau hauv lwm yam khoom hu ua hnyav.Dissolving yog thaum lub solute tawg los ntawm ib tug loj siv lead ua ntawm molecules mus rau ntau me me los yog ib tug molecules. Lawv ua qhov no los ntawm rub tawm cov ions thiab tom qab ntawd ncig cov ntsev molecules
Dab tsi yog qhov kev daws teeb meem ntawm kab?
Ib qhov system ntawm kab zauv sib npaug muaj ob lossis ntau qhov sib npaug piv txwv li. y = 0.5x + 2 y = x - 2. Cov kev daws teeb meem ntawm xws li ib qho system yog qhov kev txiav txim khub uas yog kev daws rau ob qho tib si sib npaug. Kev daws rau qhov system yuav nyob rau hauv qhov chaw uas ob kab sib tshuam
Dab tsi yog qhov txawv ntawm magnification thiab daws teeb meem ntawm ib daim duab nyob rau hauv lub tshuab microscope?
Magnification yog lub peev xwm ua kom cov khoom me me zoo li loj dua, xws li ua kom pom cov kab mob microscopic. Kev daws teeb meem yog qhov muaj peev xwm paub qhov txawv ntawm ob yam khoom ntawm ib leeg. Lub teeb microscopy muaj kev txwv rau ob qho tib si nws qhov kev daws teeb meem thiab nws qhov loj
Dab tsi yog qhov concentration ntawm hydronium ions nyob rau hauv ib qho kev daws teeb meem?
Cov dej ntshiab yog suav tias yog nruab nrab thiab qhov concentration ntawm hydronium ion yog 1.0 x 10-7 mol / L uas yog sib npaug rau hydroxide ion concentration
Dab tsi yog qhov teeb meem ntawm lub teeb nyob rau hauv lub ntuj hmo ntuj hu ua?
Gegenschein, tseem hu ua Counterglow, oval thaj ntawm faint luminosity raws nraim rau lub hnub nyob rau hauv lub hmo ntuj. Lub thaj ntawm lub teeb yog li faint nws tuaj yeem pom tsuas yog thaum tsis muaj lub hli, nyob deb ntawm lub nroog teeb, thiab nrog lub qhov muag yoog rau qhov tsaus ntuj