Kuyini Ubudlelwano Besikhathi
Sivame ukucabanga ngesikhathi njengento eqinisekile: umzuzwana owodwa eJakarta ufana nomzuzwana owodwa eLondon, futhi noma yiliphi iwashi "lizogijima" ngendlela efanayo yonke indawo. Kodwa-ke, i-physics yanamuhla ikhombisa ukuthi lokhu kucabanga akulona iqiniso ngokuphelele. Ngaphansi kwezimo ezithile, isikhathi "singagijima" kancane noma ngokushesha kuye ngesivinini kanye namandla adonsela phansi. Lo mbono waziwa ngokuthi ukuhlobana kwesikhathi—umqondo oyinhloko embonweni ka-Albert Einstein wokuhlobana okwashintsha indlela abantu abaqonda ngayo indawo yonke.
Isikhathi: Kuphelele Noma Kuhlobene?
Ngaphambi kuka-Einstein, umbono owawubusa kakhulu kwi-physics (ikakhulukazi i-Newtonian physics) wawuthi isikhathi sasiyinto yonke futhi sifana kubo bonke ababukeli. Lokhu kwakusho ukuthi uma abantu ababili bebona isenzakalo esifanayo, babezovumelana ngokuthi kuthatha isikhathi esingakanani.
U-Einstein waguqula lo mbono. Wabonisa ukuthi ukulinganiswa kwesikhathi kuncike ezimweni zombukeli—ikakhulukazi, ijubane lombukeli kanye nensimu yamandla adonsela phansi lapho umbukeli ekhona khona. Ngamanye amazwi, ayikho "iwashi le-cosmic" elisebenza ngokufanayo endaweni yonke. Okukhona isikhathi njengoba silinganiswa yiwashi lombukeli ngamunye, ngokuvamile elibizwa ngokuthi isikhathi esifanele.
Ubudlelwano Obukhethekile: Isikhathi Sihamba Kancane Ngenxa Yesivinini
Ukuhlobana kwesikhathi kwachazwa okokuqala ngendlela ehlelekile ku-Special Theory of Relativity (1905). Le mbono isebenza uma sibheka ababukeli abahamba ngesivinini esingaguquki (hhayi ukusheshisa) futhi ayihileli amandla adonsela phansi ngokuqondile.
U-Einstein waqala ngezinkolelo ezimbili ezibalulekile:
1. Imithetho yefiziksi iyafana kubo bonke ababukeli abahamba emgqeni oqondile ngesivinini esingaguquki.
2. Ijubane lokukhanya endaweni engenalutho lihlala lingaguquguquki (cishe ama-299.792.458 m/s) kubo bonke ababuki, kungakhathaliseki ukuthi umthombo wokukhanya noma umbukeli uhamba ngesivinini esingakanani.
Lezi zimo ezimbili ziholela emphumeleni omangalisayo: uma ijubane lokukhanya kumelwe lihlale lifana kuwo wonke umuntu, khona-ke ubukhulu besikhala nesikhathi kumele "bulungise." Omunye wemiphumela eyaziwa kakhulu ukwanda kwesikhathi, lapho isikhathi njengoba silinganiswa ngumqapheli ohambayo sibonakala sidlula kancane kunesikhathi njengoba silinganiswa ngumqapheli omile.
Kalula nje, uma umuntu ehamba ngokushesha okukhulu, esondela esivinini sokukhanya, iwashi lakhe lizohamba kancane kunewashi lomuntu omile. Lo mphumela mncane kakhulu empilweni yansuku zonke ngoba ijubane lethu likude kakhulu nesivinini sokukhanya, kodwa liba likhulu ngesivinini esiphezulu kakhulu.
Isibonelo Esiqondakalayo: I-Paradox Yamawele
Enye indlela ethandwayo yokuqonda ukuhlobana kwesikhathi yi-padox yamawele. Cabanga ngamawele amabili. Elinye lisala eMhlabeni, kanti elinye ligibela umkhumbi-mkhathi ohamba eduze kwesivinini sokukhanya bese libuyela eMhlabeni. Ngokusho kokuhlobana okukhethekile, iwele elihambayo lizobhekana nesikhathi esincane—okusho ukuthi lapho libuya, lizobe lincane kunalelo elahlala eMhlabeni.
Kubizwa ngokuthi "i-paradox" ngoba kubonakala kuphambene: akufanele yini ngamunye azicabange ephumule kanti omunye uhamba? Isixazululo sihilela iqiniso lokuthi amawele ahambayo abhekana nokusheshisa lapho ehlehlisa isiqondiso, ngakho-ke isimo sawo sokubhekisela asihlali singenasici (hhayi ngaso sonke isikhathi sihamba emgqeni oqondile ngesivinini esingaguquki). Umphumela wokugcina: umehluko weminyaka ukhona.
Ubudlelwano Obujwayelekile: Amandla adonsela phansi nawo athinta isikhathi
Eminyakeni eyishumi ngemva kokuhlobana okukhethekile, u-Einstein wandisa umbono wakhe waba yi-General Theory of Relativity (1915). Lo mbono uchaza amandla adonsela phansi hhayi njengamandla njengakuNewton, kodwa njengomphumela wokugoba kwesikhathi sesikhala ngamandla nobukhulu.
Ngokujwayelekile, isikhathi sihlobene—kodwa kulokhu ngenxa yamandla adonsela phansi. Uma insimu yamandla adonsela phansi inamandla (isibonelo, lapho usondela entweni enkulu njengeplanethi, inkanyezi, noma umgodi omnyama), isikhathi sihamba kancane uma siqhathaniswa nezindawo ezinamandla adonsela phansi abuthakathaka.
Lesi simo sibizwa ngokuthi ukwanda kwesikhathi samandla adonsela phansi. Imiphumela iyathakazelisa: umuntu osebusweni boMhlaba (amandla adonsela phansi aqinile) uzobona isikhathi sihamba kancane kunomuntu osemzileni ophakeme (amandla adonsela phansi abuthakathaka). Lo mehluko mncane, kodwa ungalinganiswa ngamawashi e-athomu anembile kakhulu.
Ubufakazi Bangempela: Amawashi e-GPS nama-Atomic
Ukuhlobana kwesikhathi akuyona nje inkolelo-mbono engaqondakali. Esinye sezibonelo eziwusizo kakhulu yi-Global Positioning System (GPS). Amasathelayithi e-GPS azungeza uMhlaba endaweni ephakeme ngamakhilomitha angaba ngu-20.000 ngesivinini esiphezulu futhi asensimini yamandla adonsela phansi abuthakathaka kunobuso boMhlaba. Imiphumela emibili yenzeka ngesikhathi esisodwa:
– Ngenxa yokuthi isathelayithi ihamba ngokushesha, ukuhlobana okukhethekile kwenza iwashi lesathelayithi lihambe kancane.
– Ngenxa yokuthi isathelayithi inamandla adonsela phansi abuthakathaka, ukuhlobana okuvamile kwenza iwashi lesathelayithi ligijime ngokushesha.
Uma kungalungiswanga, lokhu kungafani kwesikhathi okuncane kuzoqongelela futhi kubangele amaphutha okuma kwe-GPS angafinyelela amakhilomitha amaningana ngosuku. Eqinisweni, izinhlelo ze-GPS zifaka ukulungiswa kokuhlobana ukuze kulondolozwe ukuzulazula okunembile. Lesi yisibonelo esinamandla sendima edlalwa ukuhlobana kobuchwepheshe besimanje.
Ingabe Lokhu Kusho Ukuthi “Ukuhamba Ngesikhathi” Kungenzeka?
Uma abantu bezwa ukuthi isikhathi singahamba ngendlela ehlukile, umbuzo ovame ukuvela umayelana nokuhamba kwesikhathi. Ngokwezinga elithile, "ukuhambela esikhathini esizayo" kungenzeka ngokomzimba: uma uhamba ngokushesha kakhulu noma useduze nensimu enamandla adonsela phansi, ungabhekana nesikhathi esincane kunomunye umuntu, bese ubuyela ukuthola ukuthi usehambe kakhulu esikhathini esizayo.
Kodwa-ke, ukuhamba kwesikhathi kuyinkimbinkimbi kakhulu futhi kusalokhu kuyindawo yokuqagela. Ezinye izixazululo zezibalo ngokuhlobana okujwayelekile zivumela izakhiwo "ezingavamile" zesikhala nesikhathi (njengezimbobo ezithile), kodwa ukuthi kungenzeka yini emvelweni, zizinzile, futhi aziphuli ezinye izimiso zomzimba akucaci. Ngakho-ke, yize ukuhlobana kwesikhathi kuvula umnyango wezingxoxo mayelana nokuhamba kwesikhathi, akusho ngokuzenzakalelayo ukuthi kungenzeka umshini wesikhathi onjengalowo osencwadini yesayensi.
Kungani Kuvela Ukuhlobana Kwesikhathi?
Ingqikithi yokuhlobana kwesikhathi ukuthi isikhala nesikhathi akuzona izigaba ezimile. Zakha into eyodwa: isikhala-isikhathi. Uma uhamba ngokushesha, "uhlola" isikhala-isikhathi ngendlela ehlukile. Uma usebunzimeni obunamandla, indwangu yesikhala-isikhathi iyagoba, ishintshe izinga lesikhathi.
Ngamazwi alula, indawo yonke igcina ukuvumelana kwemithetho yefiziksi (isb., ijubane lokukhanya elingaguquki) "ngokushintshana" indlela isikhala nesikhathi okulinganiswa ngayo ngababukeli abahlukene. Umphumela ubonakala ungavamile ngoba umuzwa wethu wathuthuka ngesivinini esiphansi kanye namandla adonsela phansi aphakathi nendawo, hhayi ezikalini ze-cosmic.
I-Penutup
Ukuhlobana kwesikhathi kungumqondo wokuthi isikhathi asihlali silingana kuwo wonke umuntu. Kuncike esivinini kanye namandla adonsela phansi. Lo mqondo uvela emibonweni ka-Einstein ekhethekile nejwayelekile yokuhlobana, futhi uboniswe ngokuhlola kanye nezinhlelo zokusebenza zobuchwepheshe ezifana ne-GPS. Ukuhlobana kwesikhathi kusikhumbuza ukuthi iqiniso elingokoqobo livame ukuba yinto engavamile kunalokho esingakulindela—nokuthi ukuqonda kwesayensi kungashintsha into eyisisekelo esiyibonayo: ukuhamba kwesikhathi ngokwaso.
Uma ufisa, ngingenza futhi inguqulo ethandwa kakhulu (yesitayela esivamile) yalesi sihloko noma inguqulo yesayensi egcwele amafomula okwandisa isikhathi kanye nezibonelo zokubala.
