Mienzaniso 24 yeMibvunzo yeFluid Dynamics
Dzidziso yaTorriceli
1. Tabhu hombe yakazadzwa nemvura nepombi sezvakaratidzwa mumufananidzo. Kana g = 10 ms -2 , saka kumhanya kwemvura inopfapfaidzwa kubva papombi...
A. 3 ms-1 
B. 8 ms -1
C. 9 ms -1
D. 30 ms -1
E. 900 ms -1
Kukurukurirana
Zvinozivikanwa kuti :
Kureba (h) = 85 cm – 40 cm = 45 cm = 0,45 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo : Kumhanya kwekupfapfaidza mvura kubva mupombi (v)
Mhinduro :
Dzidziso yaTorricelli inoti kumhanya kwekupfapfaidza mvura nepaburi riri kure h kubva pamusoro pemvura kwakafanana nekumhanya kwemvura inodonha yakasununguka kubva pakakwirira h.
Kumhanya kwemvura inopfapfaidzwa kunoverengwa uchishandisa fomura yekufamba kwemvura yakasununguka v t 2 = 2 gh
v t 2 = 2 gh = 2(10)(0,45) = 9
v t = √9 = 3 m/s
Mhinduro chaiyo ndiA.
2. Tangi remvura rine gomba pamadziro (ona mufananidzo). Kumhanya kwemvura painobuda mugomba iri… (g = 10 ms -2 )
A. 12 ms-1
B. 10 ms -1
C. 6 ms -1
D. 5 ms -1
E. 2 ms -1
Kukurukurirana
Zvinozivikanwa kuti :
Kureba (h) = 1,5 m – 0,25 m = 1,25 mamita
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo : Kumhanya kwemvura painobuda mugomba (v)
Mhinduro :
v t 2 = 2 gh = 2(10)(1,25) = 25
v t = √25 = 5 m/s
Mhinduro chaiyo ndiD.
3. Dziva rine mvura yakareba mita imwe (g = 10 ms -2 ) uye pane gomba rinodonhedza mvura pamadziro (ona mufananidzo). Kumhanya kwemvura inobuda mugomba iri...
A. 1 ms-1
B. 2 ms -1
C. 4 ms -1
D. 8 ms -1
E. 10 ms -1
Kukurukurirana
Zvinozivikanwa kuti :
Kureba (h) = 1 m – 0,20 m = 0,8 mamita
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo : Kumhanya kwemvura painobuda mugomba (v)
Mhinduro :
v t 2 = 2 gh = 2(10)(0,8) = 16
v t = √16 = 4 m/s
Mhinduro chaiyo ndiD.
4. Sirinda inozadzwa nemvura yakakodzera. Buri diki (diki pane huwandu hwesirinda) riri pamadziro aro, 20 cm kubva kumusoro, zvichiita kuti mvura ibude (sezvakaratidzwa pamufananidzo). Chii chinoita kuti jeti remvura ribude mugomba diki?
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
Kukurukurirana
Zvinozivikanwa kuti:
Kureba kwegomba kubva pamusoro (h) = 20 cm = 0,2 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo: Mvura inoyerera ichibva mugomba diki inomhanya zvakadii?
Mhinduro:
Dzidziso yaTorriceli inoti kumhanya kwemvura kubva mugomba kwakafanana nekumhanya kwemvura inodonha yakasununguka kubva pakakwirira h. Masvomhu:
Mhinduro chaiyo ndeiyi B.
5. Tangi remvura rine nzvimbo yakakura, ine gomba diki paA. Kumhanya kwemvura inobuda mugomba A...
A. zvakananga zvakaenzana ne h
B. inoenderana zvakananga ne h 1
C. inoenderana zvakananga ne √h
D. inoenderana zvakananga ne h 2
E. inoenderana zvakananga ne (h 1 - h 2 )
Kukurukurirana
Equation yaBernoulli:
P 1 + 1/2 ρ v 1 2 + ρ gh 1 = P 2 + 1/2 ρ v 2 2 + ρ gh 2
Tsananguro: P 1 = kumanikidzwa 1, v 1 = kumhanya 1, h 1 = kureba 1, ρ = density, g = kukurumidza kwegiravhiti, P 2 = kumanikidzwa 2, v 2 = kumhanya 2, h 2 = kureba 2
Iyi equation inogona kushandiswa kuwana equation yekuverenga kumhanya kwegomba rinobuda mumvura A. Kana pamusoro petangi pakavhurika, ipapo P 1 = kumanikidzwa kwemhepo pamusoro pemvura. Kana paine gomba diki panzvimbo A, ipapo P 2 = kumanikidzwa kwemhepo kunze kwegomba diki. Kumanikidzwa kwemhepo chero kupi pedyo netangi kunofanira kunge kwakafanana, saka P 1 = P 2 . Saka, P 1 naP 2 zvinogona kubviswa kubva mu equation yaBernoulli.
1/2 ρ v 1 2 + ρ gh 1 = 1/2 ρ v 2 2 + ρ gh 2
Buri riri muA diki saka mvura inobuda nepaburi ine kumhanya kukuru, nepo nzvimbo yepamusoro yetabhu yakakura saka kumhanya kwekudonha kwemvura kudiki. Saka kukosha kwe v 2 kunosvika zero kuitira kuti 1/2 ρ v 2 2 ibviswe mu equation.
Tsananguro: v 1 = kumhanya kwemvura inobuda mugomba A, g = kukurumidza kunokonzerwa negiravhiti = 9,8 m/s 2 , h = chinhambwe chiri pakati pegomba A nepamusoro pemvura.
Mhinduro chaiyo ndiC.
6. Chubhu ine mvura yakakwana. Mumadziro mune maburi maviri madiki (madiki pane chikamu chechubhu) zvekuti mvura inobuda (sezviri kuratidzwa mumufananidzo). Chiyero chiri pakati pe x 1 na x 2 ndeche…..
A. 2: 3
B. 3: 5
C. 2 : 5
D. 4: 5
Chikamu 3: 4
Kukurukurirana
Kutanga, verenga kumhanya kwemvura inobuda muchubhu. Dzidziso yaTorriceli inoti kumhanya kwemvura inobuda muchubhu kwakafanana nekumhanya kwemvura kana ichidonha zvakasununguka kubva pakakwirira apo h 1 = 20 cm = 0,2 metres uye h 2 = 50 cm = 0,5 metres.
Mhinduro chaiyo ndiD.
Kuenderera mberi kweEquation
7. Mvura inoyerera kubva papombi A kuenda papombi B uye inoramba ichienda papombi C. Chiyero chenzvimbo yeA kusvika papombi C i8:3. Kana mwero wekuyerera kwemvura mupombi A wakaenzana nev, saka mwero wekuyerera kwemvura mupombi C...
A. 3/8 v
B. V
C. 8/3 v
D. 3 v
E. 8 v
Kukurukurirana
Zvinozivikanwa kuti:
Nzvimbo yepakati pezvikamu A (A A ) = 8
Nzvimbo yepakati pezvikamu C (A C ) = 3
Mwero wekuyerera kwemvura mupombi A (v A ) = v
Mubvunzo: Mwero wekuyerera kwemvura mupombi C (v C )
Mhinduro:
Fomura yekuenzanisa kwekuenderera mberi:
A A v A = A C v C
8 v = 3 v C
v C = 8/3 v
Mhinduro chaiyo ndiC.
8. Pombi ine dhayamita ye 12 cm inotetepa kune rumwe rutivi kusvika padhayamita ye 8 cm. Kana kumhanya kwekuyerera muchikamu chikuru chedhayamita yepombi kuri 10 cm/s, saka kumhanya kwekuyerera pamucheto mudiki ndiko…..
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
Kukurukurirana
Zvinozivikanwa kuti:
Dhayamita 1 (d 1 ) = 12 cm, radius 1 (r 1 ) = 6 cm
Dhayamita 2 (d 2 ) = 8 cm, radius 2 (r 2 ) = 4 cm
Mwero wekuyerera kwemvura 1 (v 1 ) = 10 cm/s
Zvinodiwa: mwero wekuyerera kwemvura 2 (v 2 )
Mhinduro:
Muchinjikwa-chikamu 1 (A 1 ) = π r 2 = π 6 2 = 36π cm 2
Muchinjikwa-chikamu 2 (A 2 ) = π r 2 = π 4 2 = 16π cm 2
Equation yekuenderera mberi kwemvura:
A 1 vs 1 = A 2 vs 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
Mhinduro chaiyo ndiA.
9. Mvura inoyerera nemupombi sezvakaratidzwa pamufananidzo unotevera. Kana nzvimbo yepakati pechikamu A1 = 8 cm2 , A2 = 2 cm2 uye kumhanya kwemvura v2 = 2 m/s saka hukuru hwe v1 huri …
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
Kukurukurirana
Zvinozivikanwa kuti :
Nzvimbo yepakati pezvikamu 1 (A 1 ) = 8 cm 2
Nzvimbo yepakati pezvikamu 2 (A 2 ) = 2 cm 2
Kumhanya kwemvura pachikamu chechipiri (v 2 ) = 2 m/s
Zvinodiwa : kumhanya kwemvura pachikamu 1 (v 1 )
Mhinduro :
Equation yekuenderera mberi kwemvura :
A 1 vs 1 = A 2 vs 2
8 v 1 = (2)(2)
8 v 1 = 4
v 1 = 4 / 8 = 0,5 m/s
Mhinduro chaiyo ndiA.
10. Tarisa mufananidzo! Kana dhayamita yechikamu chikuru chemuchinjikwa iri kaviri dhayamita yechikamu chidiki chemuchinjikwa, kumhanya kwekuyerera kwemvura mupombi diki ...
A. 01 ms-1
B. 04 ms −1
C. 08 ms −1
D. 16 ms −1
E. 20 ms −1
Kukurukurirana
Zvinozivikanwa kuti :
Dhayamita hombe yechikamu chakachinjika (d 1 ) = 2
Nharaunda yechikamu chikuru (r 1 ) = ½ d 1 = ½ (2) = 1
Nharaunda huru yemuchinjikwa ( A 1 ) = π r 1 2 = π (1) 2 = π (1) = π
Dhayamita diki yechikamu chakachinjika (d 2 ) = 1
Dunhu diki repakati nepakati (r2 ) = ½ d 2 = ½ (1) = ½
Nharaunda diki-chikamu ( A 2 ) = π r 2 2 = π (1/2) 2 = π (1/4) = ¼ π
Kumhanya kwekuyerera kwemvura pachikamu chikuru ( v 1 ) = 4 m/s
Mubvunzo : kumhanya kwekuyerera kwemvura pachikamu chidiki ( v 2 )
Mhinduro :
Equation yekuenderera mberi kwemvura :
A 1 vs 1 = A 2 vs 2
π 4 = ¼ π (v 2 )
4 = ¼ (v 2 )
v 2 = 8 m/s
Mhinduro chaiyo ndiC.
Nheyo neEquation yaBernoulli
11. Chirevo chiri pazasi chine chekuita nesimba rekusimudza ndege, kureva...
A. Kumanikidzwa kwemhepo pamusoro pebapiro kwakakura kupfuura kumanikidzwa kwemhepo pasi pebapiro.
B. Kumanikidzwa kwemhepo pasi pemapapiro hakukanganisi kusimudzwa kwendege.
C. Kumhanya kwemhepo iri pamusoro pebapiro kwakakura kupfuura kumhanya kwemhepo iri pasi pebapiro.
D. Kumhanya kwemhepo iri pamusoro pebapiro kudiki pane kumhanya kwemhepo iri pasi pebapiro.
E. Kumhanya kwemhepo hakukanganisi kusimudzwa kwendege.
Kukurukurirana
Fomura yekumanikidza: P = F / A, apo P = kumanikidzwa, F = simba, A = nzvimbo yepamusoro.
Zvichibva pafomura iyi, kumanikidzwa kunoenderana zvakananga nesimba. Saka kana kumanikidzwa kwemhepo kwakanyanya, simba rinosunda mweya richawedzerawo. Simba ndiro rinoita kuti zvinhu zvifambe, kwete kumanikidzwa.
Nheyo yaBernoulli inoti kana kumhanya kwemhepo kwakanyanya, kumanikidzwa kwacho kwakaderera uye kana kumhanya kwemhepo kwakaderera, kumanikidzwa kwacho kwakakwira.
Kuti ndege isimuke, kusundidzira kwemhepo pasi pebapiro kunofanira kunge kwakakura. Kusundidzira kunowedzera kana kusundidzira kwemhepo pasi pebapiro kwakakura. Kusundidzira kwemhepo pasi pebapiro kwakakura kana kumhanya kwemhepo pasi pebapiro kwakaderera.
Mhinduro chaiyo ndiC.
12. Teererai zvirevo zvinotevera!
(1) simba rekusimudza ndege
(2) pombi ye hydraulic
(3) mushonga wekupfapfaidza umhutu
(4) mabharumu emhepo inopisa anogona kubhururuka
Chirevo chiri pamusoro apa chine musimboti wekushanda wakavakirwa pamutemo waBernoulli ndechekuti...
A. (1) na (2)
B. (1) uye (3)
C. (2) uye (4)
D. (1), (2), uye (4)
E. (1), (3), uye (4)
Kukurukurirana
Mashoko ane misimboti yekushanda yakavakirwa pamutemo waBernoulli ndeaya: (1) kusimudza ndege uye (3) ma sprayer eumhutu. (2) Mapombi eHydraulic anoshanda pamusimboti wemutemo waPascal. (4) Mabharumu emhepo inopisa anogona kubhururuka pamusimboti wemutemo waArchimedes (flotation).
Mhinduro chaiyo ndeiyi B.
13. Mumufananidzo, mvura inopombwa necompressor ine kumanikidzwa kwe120 kPa mupombi yepasi (1) uye inoyerera ichikwira nekumhanya kwe1 ms -1 (g = 10 ms -2 uye huwandu hwemvura i1000 kg.m -3 ). Kumanikidzwa kwemvura mupombi yepamusoro (II) ndiko….
A. 52,5 kPa
B. 67,5 kPa
C. 80,0 kPa
D. 92,5 kPa
E. 107,5 kPa
Kukurukurirana
Zvinozivikanwa kuti:
Nharaunda yepombi hombe (r 1 ) = 12 cm
Nharaunda yepombi diki (r 2 ) = 6 cm
Kumanikidzwa kwemvura mupombi hombe (p 1 ) = 120 kPa = 120.000 Pascal
Kumhanya kwemvura mupombi hombe (v 1 ) = 1 ms -1
Kureba kwepombi hombe (h 1 ) = 0 m
Kureba kwepombi diki (h 2 ) = 2 m
Kukurumidza kunokonzerwa negiravhiti (g) = 10 ms -2
Kuwanda kwemvura = 1000 kg.m -3
Mubvunzo: Kumanikidzwa kwemvura mupombi 2 (p 2 )
Mhinduro:
Kumhanya kwemvura mupombi 2 kunoverengwa uchishandisa Continuity Equation:
A 1 vs 1 = A 2 vs 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
Kumanikidzwa kwemvura mupombi 2 kunoverengwa uchishandisa equation yeBernoulli:
14. Chirevo chiri pazasi chine chekuita nesimba rekusimudza ndege ndechechokwadi...
A. Kumanikidzwa kwemhepo pamusoro pebapiro kwakakura kupfuura kumanikidzwa kwemhepo pasi pebapiro.
B. Kumanikidzwa kwemhepo pasi pemapapiro hakukanganisi kusimudzwa kwendege.
C. Kumhanya kwemhepo iri pamusoro pebapiro kwakakura kupfuura kumhanya kwemhepo iri pasi pebapiro.
D. Kumhanya kwemhepo iri pamusoro pebapiro kudiki pane kumhanya kwemhepo iri pasi pebapiro.
E. Kumhanya kwemhepo hakukanganisi kusimudzwa kwendege.
Kukurukurirana
Enzanisa hurukuro yemubvunzo wapfuura.
Mhinduro chaiyo ndiC.
15. Mapapiro endege akagadzirwa kuti akwire kumusoro zvakanyanya, sezvakaratidzwa mumufananidzo. Kana v iri kumhanya kwemhepo uye P iri kumanikidzwa kwemhepo, saka maererano nepfungwa yaBernoulli, dhizaini yacho yakagadzirwa kuitira kuti...
A. vA > vB saka PA > PB
B. v A > v B kuitira kuti P A < P B
C. v A < v B kuitira kuti P A < P B
D. v A < v B kuitira kuti P A > P B
E. v A > v B kuitira kuti P A = P B
Kukurukurirana
Kuti bapiro rendege rikwidzwe kumusoro, kusundirwa kwemhepo pasi pebapiro kunofanira kunge kwakakura kupfuura kusundirwa pamusoro pebapiro.
Simba rekusundidzira pasi pebapiro rakakura kana mweya uri pasi pebapiro wakawanda.
Nheyo yaBernoulli inoti kumanikidzwa kwemhepo pasi pebapiro kwakakura kana kumhanya kwemhepo pasi pebapiro kuri kudiki.
Saka v A > v B kuitira kuti P A < P B
Mhinduro chaiyo ndeiyi B.
16. Teererai chirevo chinotevera!
(1) venturimeter
(2) mushonga wekupfapfaidza umhutu
(3) barometer
(4) tembiricha yekupisa
Chirevo chine chekuita nekushandiswa kwemutemo waBernoulli ndechekuti...
A. (1) na (2)
B. (1) uye (3)
C. (1) uye (4)
D. (2) na (3)
E. (2) uye (4)
Kukurukurirana
Mashoko ane misimboti yekushanda yakavakirwa pamutemo waBernoulli ndeanoti (1) venturimeter uye (2) mosquito sprayer. (3) barometer ine musimboti wekushanda wakavakirwa pa hydrostatic pressure (4) mercury kana alcohol thermometer ine musimboti wekushanda wakavakirwa pakuwedzera.
Mhinduro chaiyo ndiA.
17. Teererai chirevo chinotevera!
(1) pombi ye hydraulic
(2) kabhureta
(3) venturimeter
(4) tembiricha yekupisa
Zvishandiso zvine musimboti wekushanda wakavakirwa pamutemo waBernoulli ndeizvi...
A. (1) na (2)
B. (1) uye (3)
C. (1) uye (4)
D. (2) na (3)
E. (2) uye (4)
Kukurukurirana
Mashoko ane misimboti yekushanda yakavakirwa pamutemo waBernoulli ndeanoti (2) macarburetor uye (3) maventurimeter. (1) mapombi ehydraulic ane misimboti yekushanda yakavakirwa pa hydrostatic pressure, mutemo waPascal. (4) ma thermometer emercury kana alcohol ane misimboti yekushanda yakavakirwa pakuwedzera.
Mhinduro chaiyo ndiD.
18. Tarisa mufananidzo unotevera!
Nzvimbo yepombi hombe iri 5 m pamusoro pevhu uye pombi diki iri 1 m pamusoro pevhu. Kumhanya kwemvura mupombi hombe iri 36 km.h -1 nekumanikidzwa kwe9,1 x 10.5 Pa , nepo kumanikidzwa mupombi diki kuri 2.10.5 Pa , ipapo kumhanya kwemvura mupombi diki kuri…. (huwandu hwemvura = 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
Kukurukurirana
Zvinozivikanwa kuti:
Kumanikidzwa kwemvura mupombi hombe (p 1 ) = 9,1 x 10 5 Pascal = 910.000 Pascal
Kumanikidzwa kwemvura mupombi diki (p. 2 ) = 2 x 10 5 Pascal = 200.000 Pascal
Kumhanya kwemvura mupombi hombe (v 1 ) = 36 km/awa = 36(1000)/(3600) = 36000/3600 =10 m/s
Kureba kwepombi hombe (h 1 ) = -4 mamita
Kureba kwepombi diki (h 2 ) = 0 mamita
Kukurumidza kunokonzerwa negiravhiti (g) = 10 ms -2
Kuwanda kwemvura = 1000 kg.m -3
Mubvunzo: Kumhanya kwemvura mupombi diki (v 2 )
Mhinduro:
Kumhanya kwemvura mupombi diki (v 2 ) kunoverengwa uchishandisa equation yaBernoulli:
Mhinduro chaiyo ndiD.
19. Pombi ine radius ye 15 cm yakabatana kune imwe pombi ine radius ye 5 cm. Dzose dziri munzvimbo yakatwasuka. Kana mwero wemvura mupombi hombe uri 1 ms -1 pakumanikidzwa kwe 10 5 N m -2 , saka kumanikidzwa mupombi diki (huwandu hwemvura 1 g cm -3 ) ...
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
Kukurukurirana
Zvinozivikanwa kuti:
Nharaunda yepombi hombe (r 1 ) = 15 cm = 0,15 m
Nharaunda yepombi diki (r 2 ) = 5 cm = 0,05 m
Kumanikidzwa kwemvura mupombi hombe (p 1 ) = 10 5 N m -2 = 100.000 N m -2
Kumhanya kwemvura mupombi hombe (v 1 ) = 1 ms -1
Kukurumidza kunokonzerwa negiravhiti (g) = 10 ms -2
Kuwanda kwemvura = 1 gr cm -3 = 1000 kg m -3
Mapombi ese ari maviri ari munzvimbo yakatwasuka zvekuti musiyano wekukwirira kwepombi (Δh) = 0.
Mubvunzo: Kumanikidzwa mupombi diki (p. 2 )
Mhinduro:
Kumhanya kwemvura mupombi 2 kunoverengwa uchishandisa Continuity Equation:
A 1 vs 1 = A 2 vs 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
Kumanikidzwa kuri mupaipi diki (p 2 ) kunoverengwa uchishandisa equation yeBernoulli:
Mhinduro chaiyo ndiD.
Nheyo yaBernoulli
20. Tarisa mufananidzo wemushonga unouraya umhutu uri mumufananidzo unotevera! P inomiririra kumanikidzwa uye v inomiririra mwero wekuyerera kwemvura inouraya umhutu. Kuti mvura inouraya umhutu ibude, unofanira...
A. vA =vB uye PA =PB
B. v A > v B na P A > P B
C. v A > v B uye P A < P B
D. v A < v B na P A > P B
E. v A < v B uye P A < P B
Kukurukurirana
v A > v B
p A < p B
Mhinduro chaiyo ndiC.
21. Mapapiro endege akagadzirwa kuti akwire kumusoro zvakanyanya, sezvakaratidzwa mumufananidzo. Kana v iri kumhanya kwemhepo uye P iri kumanikidzwa kwemhepo, saka maererano nepfungwa yaBernoulli dhizaini yakagadzirwa kuitira kuti...
A. vA > vB saka PA > PB
B. v A > v B kuitira kuti P A < P B
C. v A < v B kuitira kuti P A < P B
D. v A < v B kuitira kuti P A > P B
E. v A > v B kuitira kuti P A = P B
Kukurukurirana
Kuti bapiro rendege rikwidzwe kumusoro, kusundirwa kwemhepo pasi pebapiro kunofanira kunge kwakakura kupfuura kusundirwa pamusoro pebapiro.
Kusundidzirwa pasi pebapiro kwakanyanya kana kumanikidzwa kwemhepo pasi pebapiro kwakanyanya. P = F/A, apo kumanikidzwa P kwakanangana zvakananga naF. Kumanikidzwa kukuru, simba rinokurawo.
Nheyo yaBernoulli inoti kumanikidzwa kwemhepo pasi pebapiro kwakakura kana kumhanya kwemhepo pasi pebapiro kuri kudiki.
Saka v A > v B kuitira kuti P A < P B
Mhinduro chaiyo ndeiyi B.
Torriceli
22. Tangi remvura rakareba masendimita 100 rinozadzwa nemvura zvakakwana. Homwe Q iri pamusoro pevhu masendimita gumi. Daro remvura rakatwasuka (x) ndiro…
A. 0,2 m
B. 0,3 m
C. 0,6 m
D. 0,9 m
E. 1,0 m
Kukurukurirana
Zvinozivikanwa kuti:
Kureba kwegomba kubva pamusoro pemvura (h) = 100 cm – 10 cm = 90 cm = 0,9 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo: Kureba kwejeti yemvura yakatwasuka (x)
Mhinduro:
Kumhanya kwemvura ichibuda mugomba
Dzidziso yaTorriceli inoti kumhanya kwejeti remvura richibuda mugomba kwakafanana nekumhanya kwemvura ichidonha yakasununguka kubva pakakwirira h. Masvomhu:
Tsananguro: v = kumhanya, g = kukurumidza kwegiravhiti, h = daro regomba kubva pamusoro pemvura
Kumhanya kwemvura inobuda mugomba:
Nguva iyo mvura inosvika pamusoro pevhu
Kufamba kwemvura kubva mugomba kusvika yasvika pasi ndiko kufamba kweparabolic, uko nzira yacho iri sezvakaratidzwa pamufananidzo uri padivi. Kufamba kweparabolic kunoonekwa sekwakaumbwa nemhando mbiri dzekufamba, dzinoti kufamba kwakatwasuka uye kufamba kwakatwasuka. Kufamba kwakatwasuka kunoongororwa se kufamba kwakafanana kwemutsetse uye kufamba kwenzira yakatwasuka munyaya iyi kunoongororwa se kufamba kwemahara kwekudonha.
Kutanga, verenga nguva iyo mvura iri mumhepo uchishandisa fomura yekudonha yakasununguka.
Zvinozivikanwa kuti:
Kureba kwegomba (y) = 10 cm = 0,1 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Akabvunzwa: nguva (t)
Mhinduro:
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 masekonzi
Daro rakatwasuka (x)
Zvinozivikanwa kuti:
Kumhanya kwekutanga (v o = v ox ) = 3 √2 m/s
Nguva (t) yemvura mumhepo = √0,02 masekondi
Mubvunzo: Daro rakati sandara (x)
Mhinduro:
v = x / t
x = vt = (3 √2) ( √0,02) = (3)(1,41)(0,14) = 0,59 = 0,6 mamita
Mhinduro chaiyo ndiC.
23. Tarisa mufananidzo unotevera!
Tangi rine mvura inosvika 1 m. Panzvimbo P mumadziro etangi pane buri diki, saka kumhanya kwemvura kubuda ndekwekuti… (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
Kukurukurirana
Zvinozivikanwa kuti:
Kureba kwegomba kubva pamusoro pemvura (h) = 100 cm – 80 cm = 20 cm = 0,2 metres
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s 2
Mubvunzo: Kumhanya kwekubuda kwemvura (v)
Mhinduro:
Kumhanya kwemvura inobuda mugomba:
Mhinduro chaiyo ndiD.
Venturimeter
24. Chikamu chikuru chepombi ye venturimeter chine nzvimbo yepakati pezvikamu A1 = 6 masendimita2 uye chikamu chidiki chepaipi chine nzvimbo yakachinjika A2 = 5 masendimita2Kumhanya kwemvura inopinda mupombi ye venturimeter ndekwe... 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
Kukurukurirana:
Mhinduro chaiyo ndeiyi B.
Kwakabva mubvunzo:
Mibvunzo yeNational Examination Physics yeChikoro Chesekondari/Chikoro Chepamusoro Chebasa
