Izibonelo Ezi-6 Zemibuzo Yomthetho Ka-Archimedes
1. Yiliphi ivolumu yetshe elifakwa emanzini olwandle uma isisindo samanzi olwandle esisuswe yitshe singama-Newton amabili? Ubuningi bamanzi olwandle = 1025 kg/m3.
Ingxoxo
Impendulo:
Umthetho ka-Archimedes Isho lokho isisindo samanzi achithekile (amanzi asuswa yinsimbi) alingana amandla amakhulu okuphapha okwenziwa ngamanzi ensimbini.
Umthamo wamanzi asusiwe = umthamo wedwala elicwiliswe emanzini olwandle = 199,1 cm 3.
2. Isitsha esigcwele amanzi. Ucezu lwensimbi 2 cm3 kucwiliswe esitsheni ukuze amanye amanzi achitheke. Iyini isisindo samanzi achithekayo?
Ingxoxo
3. Isisindo sento esemoyeni singama-15 kg kanti isisindo sento esemanzini singama-13,7 kg. Ingabe le nto yenziwe ngegolide elicwengekileyo?
Ingxoxo
Kuyaziwa ukuthi:
m = 15 kg
m' = 13,7 kg
Ubuziwe: ingabe into yenziwe ngegolide elicwengekileyo?
Impendulo:
Amandla adonsela phansi akhethekile igolide elicwengekile = 19,3 noma ubuningi begolide elicwengekile = 19300 kg/m3Uma ubukhulu bento bufana nobukhulu begolide elicwengekileyo, khona-ke into yenziwe ngegolide elicwengekileyo.
Kuyini ubuningi bento? ?
Amandla okuqina (F)A) ilingana nesisindo sento esemoyeni (w) ngaphandle kwesisindo sento esemanzini (w').
Faka inani lesisindo sento esemoyeni kanye nenani lesisindo sento esemanzini:
Isilinganiso sobuningi bento nobuningi bamanzi (/) = amandla adonsela phansi athile ento. Ngakho amandla adonsela phansi athile ento = 11,3.
Ubuningi bento = amandla adonsela phansi athile aphindaphindwe ngobuningi bamanzi = (11,3)(1000 kg/m3) = 11.300 kg/m3.
Ubukhulu begolide elicwengekile bungu-19,3 kanti ubukhulu begolide bungu-19.300 kg/m23 ngakho-ke into ayenziwe ngegolide elicwengekileyo.
4. Umkhumbi wokusindisa uzama ukuphakamisa isitsha esinesisindo esingu-4500 kg esiwele olwandle. Isitsha singamamitha ama-2 ubude, ububanzi obungu-1,5 metres, kanye nokuphakama okuyimitha eli-1. Ubuningi bamanzi olwandle ngaleso sikhathi bungu-1025 kg/m3 kanti ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s2 . Ngakho-ke, amandla amancane adingekayo ukuphakamisa into esuka phansi kolwandle iye phezulu…
Ingxoxo
Kuyaziwa:
Isisindo sebhokisi (m) = 4500 kg
Umthamo webhokisi (V) = 2 mx 1,5 mx 1 m = 3 m3
Ubuningi bamanzi olwandle ( ρ) = 1025 kg/ m3
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s 2
Umbuzo: Yimaphi amandla amancane adingekayo ukuze kuphakanyiswe into esuka phansi olwandle iye phezulu?
Impendulo:
Isisindo sento esemoyeni = mg = (4500 kg)(10 m/s 2 ) = 45000 N
Ukuze uphakamise into emhlabeni, amandla amancane angama- 45000 N.
Ubukhulu bamandla okuqina:
F A = ρ F g V = ( 1025)(10)(3) = 30750 N
Isisindo sento emanzini olwandle = 45000 N – 30750 N = 14250 N
Ukuze uphakamise into olwandle, amandla amancane kakhulu angama-14250 N.
5. Into intanta oketshezini olunobunzima obungu-800 kg/m3Uma ingxenye yesine yento ingacwiliswanga oketshezini, khona-ke ubuningi bento bu...
A. 600 kg/m3
B. 900 kg/m3
C. 1000 kg/m3
D. 1200 kg/m3
E. 1300 kg/m3
Ingxoxo:
Kuyaziwa ukuthi:
Ubuningi uketshezi = 800 kg/m3
Umthamo wento engacwiliswanga oketshezini = ¼
Umthamo wento ecwiliswe oketshezini = ¾
Ivolumu iyonke yento = 1
Kubuziwe :
Ubuningi into?
Jawab :
Ifomula yobudlelwano phakathi ukuminyana izinto, ubuningi boketshezi kanye nezingxenye zezinto ezicwiliswe futhi ezingacwilisiwe oketshezini, kuxoxwa ngazo esihlokweni kungani izinto eziqinile zintanta? :
Impendulo efanele ngu-A.
6. Isisindo sento esemoyeni singama-5 N. Uma into ikalwa emanzini (ubuningi bamanzi = 1000 kg/m23) isisindo siba ngu-3,2 N. Uma ukusheshisa ngenxa yamandla adonsela phansi g = 10 m/s2 khona-ke ubuningi bento bu...
A. 800 kg/m3
B. 1000 kg/m3
C. 1500 kg/m3
D. 2500 kg/m3
E. 2780 kg/m3
Ingxoxo:
Kuyaziwa ukuthi:
Isisindo sento emoyeni = Isisindo sento (w) = 5 Newtons
Isisindo sento emanzini = 3,2 amaNewton
Ubuningi amanzi = 1000 kg/m3
Ukusheshisa Amandla Adonsela Phansi = 10m/s2
Isisindo sento: w = mg —> m = w : g = 5 N : 10 m/s2 = 0,5kg
Kubuziwe:
Ubuningi into?
Impendulo:
Isisindo sento emanzini sincane ngenxa yamandla okuntanta.
Ukuqina = Isisindo sento esemoyeni – Isisindo sento esemanzini
Ukuqina = AmaNewton angu-5 – AmaNewton angu-3,2 = AmaNewton angu-1,8
Ubuningi bento :
Ubuningi = Isisindo: Umthamo = 0,5 kg: 0,00018 m3 = 2780 kg / m3
Impendulo efanele ngu-E.
Imibuzo yomthetho ka-Archimedes
1. Yiliphi ivolumu yetshe elifakwa emanzini uma isisindo samanzi asuswe yitshe singama-Newton ama-5? Ubuningi bamanzi = 1000 kg/m3 (501 cm3)
2. Isitsha esigcwele uphethiloli. Ucezu lwezinkuni 1,2 dm3 kucwiliswe esitsheni kangangokuthi uphethiloli othile uchitheke. Ungakanani uphethiloli ochithwe? (amagremu angu-816)
3. Isisindo sensimbi emoyeni singama-13 kg kanti isisindo sensimbi emanzini singama-12,3 kg. Ingabe insimbi yenziwe ngegolide elihlanzekile? (Cha, ngoba amandla adonsela phansi ensimbi = 18,6. Amandla adonsela phansi egolide = 19,3)
