Mehlala e 24 ea Lipotso tsa Matla a Mokelikeli
Khopolo-taba ea Torriceli
1. Bate e kholo e tletseng metsi le pompo joalokaha ho bontšitsoe setšoantšong. Haeba g = 10 ms -2 , joale lebelo la metsi a fafatsang pompo ke...
A. 3 ms-1 
B. 8 ms -1
C. 9 ms -1
D. 30 ms -1
E. 900 ms -1
Puisano
Hoa tsebahala hore :
Bolelele (h) = 85 cm – 40 cm = 45 cm = 0,45 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso : Lebelo la ho fafatsa metsi ho tsoa pompong (v)
Karabo :
Khopolo-taba ea Torricelli e bolela hore lebelo la ho fafatsa metsi ka lesoba le hole h ho tloha holim'a metsi le tšoana le lebelo la metsi a oelang ka bolokolohi ho tloha bophahamong h.
Lebelo la spray ea metsi le baloa ho sebelisoa foromo ea motsamao oa ho oa mahala v t 2 = 2 gh
v t 2 = 2 gh = 2(10)(0,45) = 9
v t = √9 = 3 m/s
Karabo e nepahetseng ke A.
2. Tanka ea metsi e na le lesoba leboteng (sheba setšoantšo). Lebelo la metsi ha a tsoa lesobeng ke… (g = 10 ms -2 )
A. 12 ms-1
B. 10 ms -1
C. 6 ms -1
D. 5 ms -1
E. 2 ms -1
Puisano
Hoa tsebahala hore :
Bolelele (h) = 1,5 m – 0,25 m = 1,25 limithara
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso : Lebelo la metsi ha a tsoa ka mokoting (v)
Karabo :
v t 2 = 2 gh = 2(10)(1,25) = 25
v t = √25 = 5 m/s
Karabo e nepahetseng ke D.
3. Tanka e na le metsi a bolelele ba mithara e le 1 (g = 10 ms -2 ) mme ho na le lesoba le dutlang leboteng (sheba setshwantsho). Lebelo la metsi a tswang ka lesobeng ke...
A. 1 ms-1
B. 2 ms -1
C. 4 ms -1
D. 8 ms -1
E. 10 ms -1
Puisano
Hoa tsebahala hore :
Bolelele (h) = 1 m – 0,20 m = 0,8 limithara
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso : Lebelo la metsi ha a tsoa ka mokoting (v)
Karabo :
v t 2 = 2 gh = 2(10)(0,8) = 16
v t = √16 = 4 m/s
Karabo e nepahetseng ke D.
4. Silindara e tlatsitsoe ka mokelikeli o loketseng. Lesoba le lenyenyane (le lenyenyane haholo ho feta bophahamo ba silindara) le leboteng la lona, 20 cm ho tloha holimo, e leng se lumellang mokelikeli ho phalla (joalokaha ho bontšitsoe setšoantšong). Lebelo la jete ea metsi ho tloha lesobeng le lenyenyane ke lefe?
A. 1,0 ms-1 
B. 2,0 ms –1
C. 3,0 ms –1
D. 5,0 ms –1
E. 5,5 ms –1
Puisano
Hoa tsebahala hore:
Sebaka sa lesoba ho tloha holim'a metsi (h) = 20 cm = 0,2 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Sefofane sa metsi se tswang lesobeng le lenyenyane se tsamaya ka lebelo le lekae?
Karabo:
Khopolo-taba ea Torriceli e bolela hore lebelo la metsi a phallang ka lesoba le tšoana le lebelo la metsi a theohang ka bolokolohi ho tloha bophahamong h. Ka lipalo:
Karabo e nepahetseng ke B.
5. Tanka ea metsi e na le karolo e kholo e tšekaletseng, e nang le lesoba le lenyenyane ho A. Lebelo la metsi a tsoang lesobeng A ke...
A. e lekana ka ho toba le h
B. e lekana ka ho toba le h 1
C. e lekana ka ho toba le √h
D. e lekana ka ho toba le h 2
E. e lekana ka ho toba le (h 1 – h 2 )
Puisano
Tekanyo ea Bernoulli:
P 1 + 1/2 ρ v 1 2 + ρ gh 1 = P 2 + 1/2 ρ v 2 2 + ρ gh 2
Tlhaloso: P 1 = kgatello 1, v 1 = lebelo 1, h 1 = bophahamo 1, ρ = bongata, g = ho potlaka ha matla a khoheli, P 2 = kgatello 2, v 2 = lebelo 2, h 2 = bophahamo 2
Tekanyo ena e ka sebediswa ho fumana equation bakeng sa ho bala lebelo la lesoba le tswang ka metsi A. Haeba karolo e ka hodimo ya tanka e butswe, jwale P 1 = kgatello ya moya ka hodima metsi. Haeba ho na le lesoba le lenyenyane ntlheng ya A, jwale P 2 = kgatello ya moya ka ntle ho lesoba le lenyenyane. Kgatello ya moya kae kapa kae haufi le tanka e tlameha ho tshwana, kahoo P 1 = P 2 . Kahoo, P 1 le P 2 di ka tloswa ho equation ya Bernoulli.
1/2 ρ v 1 2 + ρ gh 1 = 1/2 ρ v 2 2 + ρ gh 2
Lesoba le ho A le lenyenyane kahoo metsi a tswang ka lesoba a na le lebelo le leholo, athe sebaka sa bate se seholo kahoo lebelo la ho theoha ha metsi le lenyenyane. Kahoo boleng ba v 2 bo atamela lefela hoo 1/2 ρ v 2 2 e tlosoang ho equation.
Tlhaloso: v 1 = lebelo la metsi a tswang ka hara lesoba A, g = ho potlaka ka lebaka la matla a khoheli = 9,8 m/s 2 , h = sebaka se pakeng tsa lesoba A le bokaholimo ba metsi.
Karabo e nepahetseng ke C.
6. Phaephe e na le mokelikeli o loketseng. Leboteng ho na le masoba a mabeli a manyane (a manyane haholo ho feta karolo e tšekaletseng ea phaephe) e le hore mokelikeli o ntše (joalokaha ho bonoa setšoantšong). Karolelano lipakeng tsa x 1 le x 2 ke…..
K. 2: 3
B. 3: 5
C. 2: 5
D. 4: 5
E. 3: 4
Puisano
Taba ea pele, bala lebelo la metsi a tsoang ka har'a tube. Khopolo-taba ea Torriceli e bolela hore lebelo la metsi a tsoang ka har'a tube le tšoana le lebelo la metsi ha a oela ka bolokolohi ho tloha bophahamong moo h 1 = 20 cm = 0,2 metres le h 2 = 50 cm = 0,5 metres.
Karabo e nepahetseng ke D.
Tekanyo ea ho Tsoela Pele
7. Metsi a phalla ho tloha phaepheng A ho ea phaepheng B mme a tsoela pele ho ea phaepheng C. Karolelano ea sebaka se tšekaletseng sa A le sebaka se tšekaletseng sa C ke 8:3. Haeba sekhahla sa phallo phaepheng A se lekana le v, joale sekhahla sa phallo phaepheng C ke...
A. 3/8 v
B. V
C. 8/3 v
D. 3 v
E. 8 v
Puisano
Hoa tsebahala hore:
Sebaka se tšekaletseng A (A A ) = 8
Sebaka se tšekaletseng C (A C ) = 3
Sekhahla sa phallo ka phaepheng A (v A ) = v
Potso: Sekhahla sa phallo ka phaepheng C (v C )
Karabo:
Foromo ea equation ea ho tsoela pele:
A A v A = A C v C
8 v = 3 v C
v C = 8/3 v
Karabo e nepahetseng ke C.
8. Phaephe e bophara ba 12 cm e sesefala pheletsong e 'ngoe ho isa bophara ba 8 cm. Haeba lebelo la phallo karolong e kholo ea phaephe e le 10 cm/s, joale lebelo la phallo pheletsong e nyane ke…..
A. 22,5 cm/s
B. 4,4 cm/s
C. 2,25 cm/s
D. 0,44 cm/s
E. 0,225 cm/s
Puisano
Hoa tsebahala hore:
Bophara ba 1 (d 1 ) = 12 cm, radius 1 (r 1 ) = 6 cm
Bophara ba 2 (d 2 ) = 8 cm, radius 2 (r 2 ) = 4 cm
Sekhahla sa phallo 1 (v 1 ) = 10 cm/s
Ho batloa: sekhahla sa phallo 2 (v 2 )
Karabo:
Sebaka sa sefapano sa 1 (A 1 ) = π r 2 = π 6 2 = 36π cm 2
Sebaka sa sefapano sa 2 (A 2 ) = π r 2 = π 4 2 = 16π cm 2
Tekanyo ea ho tsoela pele ha mokelikeli:
A 1 khahlanong le 1 = A 2 khahlanong le 2
(36π)(10) = (16π) v 2
(36)(10) = (16) v 2
360 = (16) v 2
v 2 = 360/16
v 2 = 22,5 cm/s
Karabo e nepahetseng ke A.
9. Mokelikeli o phalla ka phaepheng jwalo ka ha ho bontshitswe setshwantshong se latelang. Haeba sebaka sa karolo e tshekaletseng A1 = 8 cm2 , A2 = 2 cm2 le lebelo la mokelikeli v2 = 2 m/s jwale boholo ba v1 ke …
A. 0,5 ms-1
B. 1,0 ms -1
C. 1,5 ms -1
D. 2,0 ms -1
E. 2,5 ms -1
Puisano
Hoa tsebahala hore :
Sebaka se tšekaletseng 1 (A 1 ) = 8 cm 2
Sebaka se tšekaletseng 2 (A 2 ) = 2 cm 2
Lebelo la mokelikeli karolong ea 2 (v 2 ) = 2 m/s
Ho batloa : lebelo la mokelikeli karolong e tšelang 1 (v 1 )
Karabo :
Tekanyo ea ho tsoela pele ha mokelikeli :
A 1 khahlanong le 1 = A 2 khahlanong le 2
8 v 1 = (2)(2)
8 v 1 = 4
v 1 = 4 / 8 = 0,5 m/s
Karabo e nepahetseng ke A.
10. Sheba setšoantšo! Haeba bophara ba karolo e kholo e tšekaletseng bo habeli ba karolo e nyane e tšekaletseng, lebelo la phallo ea mokelikeli phaepheng e nyane ke...
A. 01 ms-1
B. 04 ms −1
C. 08 ms −1
D. 16 ms −1
E. 20 ms −1
Puisano
Hoa tsebahala hore :
Bophara bo boholo ba karolo e tšekaletseng (d 1 ) = 2
Radius ea karolo e kholo e tšekaletseng (r 1 ) = ½ d 1 = ½ (2) = 1
Sebaka se seholo sa sefapano ( A 1 ) = π r 1 2 = π (1) 2 = π (1) = π
Bophara bo bonyenyane ba karolo e tšekaletseng (d 2 ) = 1
Radius e nyane e nang le karolo e tsheletseng (r 2 ) = ½ d 2 = ½ (1) = ½
Sebaka se senyenyane sa sefapano ( A 2 ) = π r 2 2 = π (1/2) 2 = π (1/4) = ¼ π
Lebelo la phallo ea mokelikeli karolong e kholo ea sefapano ( v 1 ) = 4 m/s
Potso : lebelo la phallo ea mokelikeli karolong e nyane ea sefapano ( v 2 )
Karabo :
Tekanyo ea ho tsoela pele ha mokelikeli :
A 1 khahlanong le 1 = A 2 khahlanong le 2
π 4 = ¼ π (v 2 )
4 = ¼ (v 2 )
v 2 = 8 m/s
Karabo e nepahetseng ke C.
Molao-motheo le Tekanyo ea Bernoulli
11. Polelo e ka tlase e amana le matla a ho phahamisa sefofane, e leng...
A. Kgatelelo ya moya e ka hodima lepheo e kgolo ho feta kgatelelo ya moya e ka tlasa lepheo.
B. Khatello ea moea tlas'a mapheo ha e ame ho phahama ha sefofane.
C. Lebelo la phallo ea moea ka holim'a lepheo le leholo ho feta lebelo la phallo ea moea ka tlas'a lepheo.
D. Lebelo la phallo ea moea ka holim'a lepheo le lenyenyane ho feta lebelo la phallo ea moea ka tlas'a lepheo.
E. Lebelo la phallo ea moea ha le ame ho phahamisoa ha sefofane.
Puisano
Foromo ea khatello: P = F / A, moo P = khatello, F = matla, A = sebaka sa bokaholimo.
Ho latela mokhoa ona, kgatello e lekana ka ho toba le kgatello. Kahoo haeba kgatello ya moya e le kgolo, matla a sututsang moya le wona a tla ba maholo. Matla ke wona a etsang hore dintho di tsamaye, e seng kgatello.
Molao-motheo oa Bernoulli o re haeba lebelo la moea le phahame, joale khatello e tlase 'me haeba lebelo la moea le le tlase, joale khatello e phahame.
Hore sefofane se phahame, ho sutumetsoa ha moea o ka tlas'a lepheo ho lokela ho ba hoholo. Ho sutumetsoa ho hoholo ha khatello ea moea o ka tlas'a lepheo e le kholo. Khatello ea moea o ka tlas'a lepheo e kholo ha lebelo la moea o ka tlas'a lepheo le le tlase.
Karabo e nepahetseng ke C.
12. Ela hloko lipolelo tse latelang!
(1) matla a ho phahamisa sefofane
(2) pompo ea haeteroliki
(3) spray ea monoang
(4) libalune tsa moea o chesang li ka fofa
Polelo e kaholimo eo molao-motheo oa eona oa ts'ebetso o thehiloeng molaong oa Bernoulli ke...
A. (1) le (2)
B. (1) le (3)
C. (2) le (4)
D. (1), (2), le (4)
E. (1), (3), le (4)
Puisano
Lipolelo tseo melao-motheo ea tsona ea ts'ebetso e thehiloeng molaong oa Bernoulli ke (1) ho phahamisa lifofane le (3) li-sprayer tsa menoang. (2) Lipompo tsa hydraulic li sebetsa ho latela molao-motheo oa molao oa Pascal. (4) Libalune tsa moea o chesang li ka fofa ho latela molao-motheo oa molao oa Archimedes (flotation).
Karabo e nepahetseng ke B.
13. Setšoantšong, metsi a pompeloa ka compressor e nang le khatello ea 120 kPa ka har'a phaephe e ka tlase (1) 'me a phalla ho ea holimo ka lebelo la 1 ms -1 (g = 10 ms -2 'me boima ba metsi ke 1000 kg.m -3 ). Khatello ea metsi ka har'a phaephe e ka holimo (II) ke….
A. 52,5 kPa
B. 67,5 kPa
C. 80,0 kPa
D. 92,5 kPa
E. 107,5 kPa
Puisano
Hoa tsebahala hore:
Radius ea phaephe e kholo (r 1 ) = 12 cm
Radius ea phaephe e nyane (r 2 ) = 6 cm
Kgatelelo ya metsi ka hara phaephe e kgolo (leq. 1 ) = 120 kPa = 120.000 Pascal
Lebelo la metsi phaepheng e kholo (v 1 ) = 1 ms -1
Bophahamo ba phaephe e kgolo (h 1 ) = 0 m
Bophahamo ba phaephe e nyane (h 2 ) = 2 m
Ho potlaka ka lebaka la matla a khoheli (g) = 10 ms -2
Boima ba metsi = 1000 kg.m -3
Potso: Khatello ea metsi ka har'a phaephe ea 2 (leq. 2 )
Karabo:
Lebelo la metsi ka phaepheng ea 2 le baloa ho sebelisoa Continuity Equation:
A 1 khahlanong le 1 = A 2 khahlanong le 2
(π r 1 2 ) (v 1 ) = (π r 2 2 )(v 2 )
(r 1 2 )(v 1 ) = (r 2 2 )(v 2 )
(r 1 2 )(v 1 ) = (r 2 2 )(v 2 )
(12 2 )(1 m/s) = (6 2 )(v 2 )
144 = 36 v 2
v 2 = 144 / 36
v 2 = 4 m/s
Khatello ea metsi ka har'a phaephe ea 2 e baloa ho sebelisoa equation ea Bernoulli:
14. Polelo e ka tlase e amanang le matla a ho phahamisa sefofane e nepahetse...
A. Kgatelelo ya moya e ka hodima lepheo e kgolo ho feta kgatelelo ya moya e ka tlasa lepheo.
B. Khatello ea moea tlas'a mapheo ha e ame ho phahama ha sefofane.
C. Lebelo la phallo ea moea ka holim'a lepheo le leholo ho feta lebelo la phallo ea moea ka tlas'a lepheo.
D. Lebelo la phallo ea moea ka holim'a lepheo le lenyenyane ho feta lebelo la phallo ea moea ka tlas'a lepheo.
E. Lebelo la phallo ea moea ha le ame ho phahamisoa ha sefofane.
Puisano
Bapisa puisano ea potso e fetileng.
Karabo e nepahetseng ke C.
15. Mapheo a sefofane a etselitsoe ho fana ka ho phahamisa hodimo ho hoholo, jwalo ka ha ho bontshitswe setshwantshong. Haeba v ke lebelo la phallo ya moya mme P ke kgatello ya moya, ho ya ka molaomotheo wa Bernoulli, moralo o entswe ka tsela eo...
A. vA > vB e le hore PA > PB
B. v A > v B e le hore P A < P B
C. v A < v B e le hore P A < P B
D. v A < v B e le hore P A > P B
E. v A > v B e le hore P A = P B
Puisano
E le hore lepheo la sefofane le phahamisetsoe holimo, ho sutumetsoa ha moea botlaaseng ba lepheo ho lokela ho ba ho hoholo ho feta ho sutumetsoa ho holimo ha lepheo.
Matla a ho sutumelletsa ka tlas'a lepheo a maholo haeba khatello ea moea ka tlas'a lepheo e le kholo.
Molao-motheo oa Bernoulli o bolela hore khatello ea moea tlas'a lepheo e kholo ha lebelo la moea tlas'a lepheo le le lenyenyane.
Kahoo v A > v B e le hore P A < P B
Karabo e nepahetseng ke B.
16. Ela hloko polelo e latelang!
(1) venturimeter
(2) spray ea monoang
(3) barometer
(4) thermometer
Polelo e amanang le ts'ebeliso ea molao oa Bernoulli ke...
A. (1) le (2)
B. (1) le (3)
C. (1) le (4)
D. (2) le (3)
E. (2) le (4)
Puisano
Lipolelo tseo melao-motheo ea tsona ea ts'ebetso e thehiloeng molaong oa Bernoulli ke (1) venturimeter le (2) sprayer ea monoang. (3) barometer eo molao-motheo oa eona oa ts'ebetso o thehiloeng khatellong ea hydrostatic (4) mercury kapa thermometer ea joala eo molao-motheo oa eona oa ts'ebetso o thehiloeng katolosong.
Karabo e nepahetseng ke A.
17. Ela hloko polelo e latelang!
(1) pompo ea haeteroliki
(2) khaburethara
(3) venturimeter
(4) thermometer
Lisebelisoa tseo molao-motheo oa tsona oa ho sebetsa o thehiloeng molaong oa Bernoulli ke...
A. (1) le (2)
B. (1) le (3)
C. (1) le (4)
D. (2) le (3)
E. (2) le (4)
Puisano
Lipolelo tseo melao-motheo ea tsona ea ts'ebetso e thehiloeng molaong oa Bernoulli ke (2) li-carburetor le (3) li-venturimeter. (1) lipompo tsa hydraulic tseo melao-motheo ea tsona ea ts'ebetso e thehiloeng khatellong ea hydrostatic, molao oa Pascal. (4) li-thermometer tsa mercury kapa joala tseo melao-motheo ea tsona ea ts'ebetso e thehiloeng katolosong.
Karabo e nepahetseng ke D.
18. Sheba setšoantšo se latelang!
Sebaka sa phaephe e kgolo ke 5 m ka hodima lefatshe mme phaephe e nyane e 1 m ka hodima lefatshe. Lebelo la phallo ya metsi phaepheng e kgolo ke 36 km.h -1 ka kgatello ya 9,1 x 10 5 Pa, ha kgatello phaepheng e nyane e le 2.10 5 Pa, ebe lebelo la metsi phaepheng e nyane ke…. (botenya ba metsi = 10 3 kg.m -3 )
A. 10 ms-1
B. 20 ms -1
C. 30 ms -1
D. 40 ms -1
E. 50 ms -1
Puisano
Hoa tsebahala hore:
Kgatelelo ya metsi ka hara phaephe e kgolo (leq. 1 ) = 9,1 x 10 5 Pascal = 910.000 Pascal
Khatello ea metsi ka phaepheng e nyane (leq. 2 ) = 2 x 10 5 Pascal = 200.000 Pascal
Lebelo la metsi phaepheng e kgolo (v 1 ) = 36 km/hora = 36(1000)/(3600) = 36000/3600 =10 m/s
Bophahamo ba phaephe e kgolo (h 1 ) = -4 metres
Bophahamo ba phaephe e nyane (h 2 ) = 0 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 ms -2
Boima ba metsi = 1000 kg.m -3
Potso: Lebelo la metsi ka phaepheng e nyane (v 2 )
Karabo:
Lebelo la metsi ka phaepheng e nyane (v 2 ) le balwa ho sebediswa equation ya Bernoulli:
Karabo e nepahetseng ke D.
19. Phaephe e nang le radius ea 15 cm e hokahantsoe le phaephe e 'ngoe e nang le radius ea 5 cm. Ka bobeli li boemong bo bataletseng. Haeba sekhahla sa phallo ea metsi phaepheng e kholo e le 1 ms -1 khatellong ea 10 5 N m -2 , joale khatello phaepheng e nyane (botenya ba metsi 1 g cm -3 ) ke ...
A. 10.000 N m -2
B. 15.000 N m -2
C. 30.000 N m -2
D. 60.000 N m -2
E. 90.000 N m -2
Puisano
Hoa tsebahala hore:
Radius ea phaephe e kholo (r 1 ) = 15 cm = 0,15 m
Radius ea phaephe e nyane (r 2 ) = 5 cm = 0,05 m
Kgatelelo ya metsi ka hara phaephe e kgolo (leq. 1 ) = 10 5 N m -2 = 100.000 N m -2
Lebelo la metsi phaepheng e kholo (v 1 ) = 1 ms -1
Ho potlaka ka lebaka la matla a khoheli (g) = 10 ms -2
Boima ba metsi = 1 gr cm -3 = 1000 kg m -3
Liphaephe ka bobeli li boemong bo otlolohileng hoo phapang ea bophahamo ba phaephe (Δh) = 0.
Potso: Kgatelelo phaepheng e nyane (leq. 2 )
Karabo:
Lebelo la metsi ka phaepheng ea 2 le baloa ho sebelisoa Continuity Equation:
A 1 khahlanong le 1 = A 2 khahlanong le 2
(π r 1 2 ) (v 1 ) = (π r 2 2 )(v 2 )
(r 1 2 )(v 1 ) = (r 2 2 )(v 2 )
(0,15 2 )(1 m/s) = (0,05 2 )(v 2 )
0,0225 = 0,0025 v 2
v 2 = 0,0225 / 0,0025
v 2 = 9 m/s
Kgatelelo e ka hara phaephe e nyane (leq. 2 ) e balwa ho sebediswa equation ya Bernoulli:
Karabo e nepahetseng ke D.
Molao-motheo oa Bernoulli
20. Sheba setšoantšo sa sprayer e thibelang menoang setšoantšong se latelang! P e emela khatello 'me v e emela sekhahla sa phallo ea mokelikeli o thibelang menoang. Ho ntša mokelikeli o thibelang menoang, o hloka ho...
A. vA = vB le PA = P.B
B. v A > v B le P A > P B
C. v A > v B le P A < P B
D. v A < v B le P A > P B
E. v A < v B le P A < P B
Puisano
v A > v B
p A < p B
Karabo e nepahetseng ke C.
21. Mapheo a sefofane a etselitsoe ho ba le bophahamo bo phahameng ka ho fetisisa ba ho phahamisa, joalo ka ha ho bontšitsoe setšoantšong. Haeba v ke lebelo la phallo ea moea 'me P ke khatello ea moea, joale ho latela molao-motheo oa Bernoulli moralo o entsoe ka tsela eo...
A. vA > vB e le hore PA > PB
B. v A > v B e le hore P A < P B
C. v A < v B e le hore P A < P B
D. v A < v B e le hore P A > P B
E. v A > v B e le hore P A = P B
Puisano
E le hore lepheo la sefofane le phahamisetsoe holimo, ho sutumetsoa ha moea botlaaseng ba lepheo ho lokela ho ba ho hoholo ho feta ho sutumetsoa ho holimo ha lepheo.
Ho sutumelletsoa ka tlase ho lepheo ho hoholo haeba kgatello ya moya ka tlase ho lepheo e le kgolo. P = F/A, moo kgatello ya P e lekanang ka ho toba le F. Ha kgatello e le kgolo, matla a ba maholo.
Molao-motheo oa Bernoulli o bolela hore khatello ea moea tlas'a lepheo e kholo ha lebelo la moea tlas'a lepheo le le lenyenyane.
Kahoo v A > v B e le hore P A < P B
Karabo e nepahetseng ke B.
Torriceli
22. Tanka ea metsi e bolelele ba 100 cm e tlatsitsoe ka metsi ka botlalo. Lesoba Q le lutse 10 cm ka holim'a mobu. Sebaka sa jete ea metsi e bataletseng (x) ke…
A. 0,2 m
B. 0,3 m
C. 0,6 m
D. 0,9 m
E. 1,0 m
Puisano
Hoa tsebahala hore:
Sebaka sa lesoba ho tloha holim'a metsi (h) = 100 cm - 10 cm = 90 cm = 0,9 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Sebaka sa jete ea metsi se otlolohileng (x)
Karabo:
Lebelo la metsi a tsoang ka sekoting
Khopolo-taba ea Torriceli e bolela hore lebelo la jete ea metsi le tsoang ka sekoting le tšoana le lebelo la metsi a oelang ka bolokolohi ho tloha bophahamong h. Ka lipalo:
Tlhaloso: v = lebelo, g = ho potlaka ha matla a khoheli, h = sebaka sa lesoba ho tloha holim'a metsi
Lebelo la jete ea metsi e tsoang ka mokoting:
Nako ea ho fihla ha metsi holim'a lefatše
Ho sisinyeha ha metsi ho tloha ka sekoting ho fihlela a fihla fatše ke motsamao oa parabola, moo tsela e leng jwalo ka ha ho bontshitswe setshwantshong se ka lehlakoreng. Motsamao wa papiso o nkuwa o na le mefuta e mmedi ya motsamao, e leng motsamao o otlolohileng le o otlolohileng. Motsamao o otlolohileng o sekasekwa jwalo ka motsamao o ts'oanang o otlolohileng 'me motsamao oa tataiso e otlolohileng tabeng ena o hlahlojoa joalo ka motsamao oa ho oa o lokolohileng.
Taba ea pele, bala nako eo metsi a leng moeeng ka eona u sebelisa foromo ea ho oa mahala.
Hoa tsebahala hore:
Bolelele ba lesoba (y) = 10 cm = 0,1 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
E botsitsweng: nako e sa fellang (t)
Karabo:
y = 1/2 gt 2
0,1 = 1/2 (10) t 2
0,1 = 5 t 2
t 2 = 0,1 / 5
t 2 = 0,02
t = √0,02 metsotsoana
Sebaka se bataletseng (x)
Hoa tsebahala hore:
Lebelo la pele (v o = v ox ) = 3 √2 m/s
Nako e pakeng tsa metsi (t) moeeng = metsotsoana e √0,02
Potso: Sebaka se bataletseng (x)
Karabo:
v = x / t
x = vt = (3 √2) ( √0,02) = (3)(1,41)(0,14) = 0,59 = 0,6 limithara
Karabo e nepahetseng ke C.
23. Sheba setšoantšo se latelang!
Tanka e na le metsi a bolelele ba 1 m. Ntlheng ea P leboteng la tanka ho na le lesoba le lenyenyane haholo, kahoo lebelo la metsi a tsoang ke… (g = 10 ms -2 )
A. 5 ms-1
B. 4 ms -1
C. 2,5 ms -1
D. 2 ms -1
E. 1,5 ms -1
Puisano
Hoa tsebahala hore:
Sebaka sa lesoba ho tloha holim'a metsi (h) = 100 cm - 80 cm = 20 cm = 0,2 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Lebelo la metsi a tswang (v)
Karabo:
Lebelo la jete ea metsi e tsoang ka mokoting:
Karabo e nepahetseng ke D.
Venturimeter
24. Karolo e kgolo ya phaephe ya venturimeter e na le sebaka se tshekaletseng sa A1 = 6 XNUMX cm2 'me karolo e nyane ea phaephe e na le sebaka se tšekaletseng sa A2 = 5 XNUMX cm2Lebelo la metsi a kenang ka phaepheng ea venturimeter ke... h = 20 cm, g = 10 m/s2.
A. 2 m/s
B. 3 m/s
C. 4 m/s
D. 5 m/s
E. 6 m/s
Puisano:
Karabo e nepahetseng ke B.
Mohloli oa lipotso:
Lipotso tsa Fisiks tsa Tlhahlobo ea Naha bakeng sa Sekolo se Phahameng sa Thuto e Phahameng/Sekolo se Phahameng sa Mosebetsi
