Imibuzo Yesibonelo Ekhuluma Ngezincazelo Zokuqala Nezesibili Zika-Einstein
U-Albert Einstein, omunye wabantu abanethonya elikhulu ku-physics, wethula ama-postulates amabili abalulekile embonweni wakhe okhethekile wokuhlobana, owaziwa ngokuthi ama-postulates okuqala nawesibili ka-Einstein. La ma-postulates aphonsela inselelo ukuqonda okuvamile isikhala nesikhathi futhi avula indlela yokuthola izinto ezintsha ku-physics. Kulesi sihloko, sizohlola ngokujulile la ma-postulates amabili futhi sinikeze izibonelo ezithile zokusisiza siqonde imiqondo ehlobene.
Isikhundla Sokuqala Sika-Einstein
I-postulate yokuqala ka-Einstein, eyaziwa nangokuthi isimiso sokuhlobana, ithi imithetho yefiziksi iyafana kuzo zonke izinhlaka zokubhekisela ze-inertial. Ngamanye amazwi, akukho hlaka lokubhekisela lwe-inertial olungcono kunolunye, futhi konke ukubonwa ngokomzimba kumele kuhlale kuhambisana kusukela kolunye uhlaka lokubhekisela lwe-inertial kuya kolunye. Lona umqondo oyinhloko okhombisa ukuthi ukunyakaza okuhlobene phakathi kwababukeli akuthinti imithetho eyisisekelo yemvelo.
Imibuzo Eyisibonelo Nengxoxo
Umbuzo 1: Izitimela ezimbili, u-A no-B, zihamba ngesivinini esingaguquki sika-\(v_A = 30 m/s\) kanye no-\(v_B = 40 m/s\) ngokulandelana ngendlela efanayo. Umgibeli osesitimeleni u-A uphonsa ibhola ngesivinini sika-\(u = 20 m/s\) ebheke phambili kwesitimela (ngasendleleni yokunyakaza kwesitimela). Bala isivinini sebhola ngokuya ngomgibeli omi esiteshini.
Ingxoxo:
Ukuze sinqume ijubane lebhola ngokusho komqaphi esiteshini, sidinga ukwengeza ijubane elihlobene lebhola esivinini sesitimela A. Njengoba konke ukunyakaza kusesilinganisweni esisodwa, singasebenzisa ukwengeza okulula kwevektha:
\[
v_{\text{ball, station}} = v_A + u = 30 \, m/s + 20 \, m/s = 50 \, m/s
\]
Ngakho-ke, ijubane lebhola ngokusho komqaphi esiteshini lingu-50 m/s\.
Umbuzo 2: I-astronaut ingaphakathi komkhumbi-mkhathi ohamba ngesivinini esingaguquki. Uma i-astronaut ivula isibani, ingabe umbukeli ongaphandle komkhumbi-mkhathi uzobona isivinini sokukhanya esihlukile kunomkhathi ongaphakathi komkhumbi-mkhathi?
Ingxoxo:
Ngokusho kwesitatimende sokuqala sika-Einstein, imithetho yefiziksi, okuhlanganisa nesivinini sokukhanya endaweni engenalutho, iyafana kuzo zonke izinhlaka zokubhekisela ze-inertial. Lokhu kusho ukuthi isivinini sokukhanya asiguquki futhi asixhomekile esivinini somthombo noma sombukeli. Ngakho-ke, bobabili i-astronaut ngaphakathi kwe-spacecraft kanye nombukeli ongaphandle kwe-spacecraft bazobona isivinini esifanayo sokukhanya, okungukuthi \(c \approx 3 \times 10^8 \, m/s\).
Isikhundla Sesibili Sika-Einstein
I-postulate yesibili ka-Einstein, eyaziwa nangokuthi isimiso sokungaguquguquki kwejubane lokukhanya, ithi ijubane lokukhanya endaweni engenalutho liyafana kubo bonke ababukeli, kungakhathaliseki ukuthi umthombo noma umqaphi ushukuma kanjani. Le posiulate inselele ukuqonda kwakudala ukuthi ijubane lokukhanya kumele lihluke kuye ngejubane lomthombo noma umqaphi.
Imibuzo Eyisibonelo Nengxoxo
Umbuzo 3: Umsebe wokukhanya ukhishwa esibanini esihamba ngesivinini esingu-\(v = 0.6c\) uma kuqhathaniswa nomqapheli omile. Bala ijubane lomsebe wokukhanya ngokusho komqapheli omile.
Ingxoxo:
Ngokusho kwesitatimende sesibili sika-Einstein, ijubane lokukhanya endaweni engenamuntu lihlala njalo futhi liyafana kubo bonke ababuki, kungakhathaliseki ukuthi ukunyakaza okuhlobene phakathi kombuki nomthombo wokukhanya kunjani. Ngakho-ke, ijubane lomsebe wokukhanya ngokusho kombuki omile lingu-\(c\), okungukuthi:
\[
v_{\text{light}} = c \cishe 3 \izikhathi 10^8 \, m/s
\]
Umbuzo 4: Izindiza ezimbili zomkhathi u-A no-B ziyasondela komunye nomunye ngesivinini \(0.5c\) kanye \(0.7c\) ngokulandelana uma kuqhathaniswa nomqapheli eMhlabeni. Liyini ijubane lomkhathi u-A ngokusho komqapheli kumkhathi u-B?
Ingxoxo:
Ezimweni ezinjengalezi, sidinga ukusebenzisa ukuguqulwa kwe-relativistic ukuze sinqume ijubane elihlobene phakathi kwezinto ezimbili ezihamba eduze kwejubane lokukhanya. Ifomula yejubane le-relativistic yezinto ezimbili ezisondelayo yile:
\[
u' = \frac{u + v}{1 + \frac{uv}{c^2}}
\]
Lapho \(u = 0.5c\) kuyijubane lesakhiwo u-A maqondana noMhlaba kanye \(v = 0.7c\) kuyijubane lesakhiwo u-B maqondana noMhlaba. Njengoba zisondela, sixhuma la manani kufomula:
\[
u' = \frac{0.5c + 0.7c}{1 + \frac{(0.5c)(0.7c)}{c^2}} = \frac{1.2c}{1 + 0.35} = \frac{1.2c}{1.35} \cishe kube ngu-0.89c
\]
Ngakho-ke, isivinini sendiza A ngokusho komqapheli endizeni B singaba ngu-\(0.89c\).
Isiphetho
Imibono yokuqala neyesibili ka-Einstein inikeza ukuqonda okuyisisekelo okusekela inkolelo-mbono ekhethekile yokuhlobana kwezinto. Imibono yokuqala ikwenza kucace ukuthi imithetho yefiziksi ayiguquki ezisekelweni zokubhekisela ezingenalutho, inikeze ukulingana phakathi kwabo bonke abaqaphi abangenalutho. Okwamanje, imibono yesibili ithi ijubane lokukhanya aliguquki, kungakhathaliseki ukuthi umthombo noma umqaphi uhamba kanjani, okuphazamisa isimiso sejubane elihlobene kufiziksi yakudala.
Ukuqonda le mibono akubalulekile nje kuphela esifundweni se-physics kodwa futhi kuthinta izinhlelo zokusebenza zobuchwepheshe zesimanje, njengezinhlelo zokuzulazula ze-GPS, ezidinga ukulungiswa kokuhlobana. Ngezivivinyo nezibonelo, le mibono ingaqondakala kalula futhi isetshenziswe ezimweni ezahlukene. Ngethemba ukuthi lesi sihloko sisize ekucaciseni izimiso eziyisisekelo ngemuva kwenkolelo-mbono ekhethekile ka-Einstein yokuhlobana.
