Mehlala e 6 ea Lipotso tsa Molao tsa Archimedes
1. Ke bophahamo bofe ba lejwe bo bewang metsing a lewatle haeba boima ba metsi a lewatle bo tlositsweng ke lejwe e le di-Newton tse 2? Boima ba metsi a lewatle = 1025 kg/m3.
Puisano
Karabo:
Molao oa Archimedes E bolela seo boima ba metsi a tšolohileng (metsi a tloswa ke tshepe) a lekana le matla a maholo a ho phaphamala e etsoang ka metsi holim'a tšepe.
Bongata ba metsi a tlositsoeng = bongata ba lefika le qoelitsoeng metsing a leoatle = 199,1 cm 3.
2. Setshelo se tletseng metsi. Sekotwana sa tshepe 2 cm3 ho qoelisoa ka setshelong hoo metsi a mang a tšolohang. Boima ba metsi a tšolohang ke bokae?
Puisano
3. Boima ba ntho e moeeng ke 15 kg mme boima ba ntho e metsing ke 13,7 kg. Na ntho eo e entsoe ka khauta e hloekileng?
Puisano
Hoa tsebahala hore:
m = 15 kg
m' = 13,7 kg
Botsoa: na ntho e entsoe ka khauta e hloekileng?
Karabo:
Matla a khoheli a khethehileng khauta e hloekileng = 19,3 kapa boima ba khauta e hloekileng = 19300 kg/m3Haeba boima ba ntho bo lekana le boima ba khauta e hloekileng, joale ntho eo e entsoe ka khauta e hloekileng.
Botenya ba ntho ke bofe? ?
Matla a ho thothomela (F)A) e lekana le boima ba ntho e moeeng (w) ntle le boima ba ntho e metsing (w').
Kenya boleng ba boima ba ntho e moeeng le boleng ba boima ba ntho e ka metsing:
Karolelano ea boima ba ntho ho ea boima ba metsi (/) = boima bo itseng ba ntho. Kahoo boima bo itseng ba ntho = 11,3.
Boima ba ntho = matla a khoheli a itseng a atisitsoeng ke boima ba metsi = (11,3)(1000 kg/m3) = 11.300 kg/m3.
Boima ba kgauta e hlwekileng bo ikgethang ke 19,3 mme boima ba kgauta ke 19.300 kg/m23 ka hona ntho eo ha e a etswa ka kgauta e hlwekileng.
4. Sekepe sa pholoso se leka ho phahamisa setshelo se boima ba 4500 kg se oetseng lewatleng. Setshelo sena se bolelele ba limithara tse 2, bophara ba limithara tse 1,5, le bophahamo ba limithara tse 1. Boima ba metsi a leoatle ka nako eo ke 1025 kg/m3 mme lebelo le bakoang ke matla a khoheli ke 10 m/s2 . Ka hona, matla a fokolang a hlokahalang ho phahamisa ntho ho tloha botebong ba leoatle ho ea holimo ke…
Puisano
Hoa tsebahala:
Boima ba lebokose (m) = 4500 kg
Bophahamo ba lebokose (V) = 2 mx 1,5 mx 1 m = 3 m 3
Boima ba metsi a leoatle ( ρ) = 1025 kg/ m3
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Ke matla afe a bonyane a hlokahalang ho phahamisa ntho ho tloha botebong ba leoatle ho ea holimo?
Karabo:
Boima ba ntho e moeeng = mg = (4500 kg)(10 m/s 2 ) = 45000 N
Ho phahamisa ntho mobung, matla a fokolang ke 45000 N.
Boholo ba matla a ho thothomela:
F A = ρ F g V = ( 1025) (10) (3) = 30750 N
Boima ba ntho ka metsing a leoatle = 45000 N – 30750 N = 14250 N
Ho phahamisa ntho lewatleng, matla a bonyane ke 14250 N.
5. Ntho e phaphamala ka hara mokelikeli oo boima ba wona e leng 800 kg/m3Haeba ¼ ea ntho e sa qoelisoa ka har'a mokelikeli, joale boima ba ntho ke...
A. 600 kg/m3
B. 900 kg/m23
C. 1000 kg/m3
D. 1200 kg/m23
E. 1300 kg/m3
Puisano:
Hoa tsebahala hore:
Botenya mokelikeli = 800 kg/m3
Bophahamo ba ntho e sa qoelisoang ka har'a metsi = ¼
Bophahamo ba ntho e qoelitsoeng ka har'a metsi = ¾
Bophahamo ba ntho ka kakaretso = 1
E botsitsoe :
Botenya ntho?
Jawab :
Foromo ea kamano pakeng tsa bongata lintho, bongata ba lintho tse metsi le likarolo tsa lintho tse qoelisoang 'me li sa qoelisoa ka har'a lintho tse metsi, li tšohloa sehloohong sena. hobaneng ha lintho tse tiileng li phaphamala? :
Karabo e nepahetseng ke A.
6. Boima ba ntho e moeeng ke 5 N. Haeba ntho e lekantsoe ka metsing (botenya ba metsi = 1000 kg/m3) boima bo fetoha 3,2 N. Haeba ho potlaka ka lebaka la matla a khoheli g = 10 m/s2 joale boima ba ntho ke...
A. 800 kg/m3
B. 1000 kg/m23
C. 1500 kg/m3
D. 2500 kg/m23
E. 2780 kg/m3
Puisano:
Hoa tsebahala hore:
Boima ba ntho e moeeng = Boima ba ntho (w) = 5 Newtons
Boima ba ntho ka metsing = 3,2 Newtons
Botenya metsi = 1000 kg/m3
Ho Potlakisa Matla a Kgoheli = 10 m/s2
Boima ba ntho: w = mg —> m = w : g = 5 N : 10 m/s2 = 0,5 kg
O botsitse:
Botenya ntho?
Karabo:
Boima ba ntho e ka metsing bo bonyenyane ka lebaka la matla a ho phaphamala.
Boikhohomoso = Boima ba ntho e moyeng – Boima ba ntho e mokelikeling
Boikhohomoso = Li-Newton tse 5 – Li-Newton tse 3,2 = Li-Newton tse 1,8
Boima ba Ntho :
Botenya = Boima: Bophahamo = 0,5 kg: 0,00018 m3 = 2780 lik'hilograma / m3
Karabo e nepahetseng ke E.
Lipotso tsa molao oa Archimedes
1. Ke bophahamo bofe ba lejwe bo bewang ka metsing haeba boima ba metsi a tlositsweng ke lejwe e le di-Newton tse 5? Boima ba metsi = 1000 kg/m3 (501 cm)3)
2. Setshelo se tletseng peterole. Patsi e nyane 1,2 dm3 e qoelisoa ka setshelong hoo karolo e 'ngoe ea peterole e ileng ea tšoloha. Boima ba peterole e tšolohileng ke bokae? (ligrama tse 816)
3. Boima ba tšepe moeeng ke 13 kg mme boima ba tšepe metsing ke 12,3 kg. Na tšepe e entsoe ka khauta e hloekileng? (Tjhe, hobane matla a khoheli a tšepe = 18,6. Matla a khoheli a khauta = 19,3)
