Izibonelo eziyi-13 zezinkinga zamagagasi
1. Bheka isithombe esilandelayo!
Uma isikhathi esithathwe yigagasi njengoba kusesithombeni singamasekhondi angu-0,3, khona-ke isikhathi segagasi...
A. 0,2 imizuzwana
B. 0,9 imizuzwana
C. 2,0 imizuzwana
D. 5,0 imizuzwana
Ingxoxo
Kuyaziwa ukuthi:
Isikhathi sokuhamba (t) = imizuzwana engu-0,3
Umbuzo: Isikhathi samagagasi (T)
Impendulo:
Kunezintaba ezintathu kanye nezigodi zamagagasi ukuze isikhathi sokuhamba kwegquma eli-1 noma isigodi samagagasi eli-1 sibe ngu-0,3 / 3 = umzuzwana ongu-0,1
I-wavelength eyodwa ine-wave crest eyodwa kanye ne-wave trough eyodwa. Ngakho-ke isikhathi sokuhamba se-wavelength eyodwa = isikhathi se-wave = 2 x 0,1 seconds = 0,2 seconds.
Impendulo efanele ngu-A.
2. Bheka isithombe esilandelayo segagasi eliphambeneyo!
Ijubane lokusabalala kwegagasi eliphambeneyo ngenhla...
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Ingxoxo
Kuyaziwa ukuthi:
Ubude obu-1 bomkhathi bunegquma eli-1 lamagagasi kanye nesigodi esi-1 samagagasi. Ngokusekelwe esithombeni esingenhla, ubude obu-1 bomkhathi ( λ) bungama-2 metres x 4 = amamitha ayi-8.
Isikhathi esidingekayo ukuhamba ubude obu-1 be-wavelength = isikhathi segagasi (T) = 0,5 x 4 = imizuzwana emi-2
Umbuzo: Isivinini sokusabalala kwamagagasi aguqukayo (v)
Impendulo:
Isivinini sokusabalala kwamagagasi aguqukayo:
v = s / t = λ / T = amamitha angu-8 / imizuzwana emi-2 = amamitha angu-4/umzuzwana
Impendulo efanele ingu-B.
3. Igrafu elandelayo ibonisa iphethini yentambo ngesikhathi igagasi eliphambeneyo lidlula kuyo. Uma indawo A kanye nendawo B zihlukaniswe ngebanga elingama-30 cm, khona-ke ijubane legagasi li…..
A. 20 cm/s
B. 15 cm/s
C. 10 cm/s
D. 7,5 cm/s
Ingxoxo
Kuyaziwa ukuthi:
Ubude obulodwa bewavelength bunegquma elilodwa lamagagasi kanye nesigodi esisodwa samagagasi. Kusukela ku-A kuya ku-B kunezingqimba zamagagasi ezingu-3/4. Uma ibanga eliphakathi kuka-A no-B lingu-30 cm khona-ke ibanga lobude obulodwa bewavelength lingu-30 cm/3 = 10 cm. Ngakho ubude obulodwa bewavelength ( λ) = 4 x 10 cm = 40 cm.
Ngokusekelwe esithombeni esingenhla, isikhathi (t) sokuhamba ubude obungu-1 be-wavelength singamasekhondi angu-4.
Umbuzo: Isivinini sokusabalala kwamagagasi (v)
Impendulo:
Ifomula esheshayo yokunciphisa ijubane:
v = s / t = λ / t
Imininingwane:
v = isivinini sokusabalala, s = ibanga, λ = ubude besikhathi, t = isikhathi
Ngakho-ke ijubane lokusabalala kwamagagasi yileli:
v = λ / t = 40 cm / 4 imizuzwana = 10 cm / 1 isekhondi = 10 cm/isekhondi
Impendulo efanele ngu-C.
4. Bheka igrafu yokuphambuka kwamagagasi ngesikhathi esithombeni esilandelayo! Uma ibanga lingu-AB = 250 cm, khona-ke isivinini sokusabalala kwamagagasi…
A. 100 cm/s
B. 125 cm/s
C. 400 cm/s
D. 500 cm/s
Ingxoxo
Kuyaziwa ukuthi:
Ibanga AB = ubude be-wavelength obungu-5/4 = 250 cm.
1/4 ubude besikhathi = 250 cm / 5 = 50 cm
Ubude obu-1 = ubude obungu-4/4 = 4 x 50 cm = 200 cm
Isikhathi esidingekayo ukuhamba ubude obungu-1 = imizuzwana emi-2
Umbuzo: Isivinini sokusabalala kwamagagasi
Impendulo:
Ifomula yesivinini sokusabalala kwamagagasi:
v = s / t = λ / t
Incazelo: v = isivinini sokusabalala kwamagagasi, s = ibanga, λ = ubude besikhathi, t = isikhawu sesikhathi
Isivinini sokusabalala kwamagagasi:
v = 200 cm / 2 imizuzwana = 100 cm/isekhondi
Impendulo efanele ngu-A.
5. Bheka isithombe! Ubukhulu bamagagasi buboniswa yi...
A. AC kanye ne-CE
B. AB' no-D'E
C. BB' no-DD'
D. B'C kanye ne-CD'
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Ubukhulu bamagagasi bungu-BB' no-DD”.
Impendulo efanele ngu-C.
6. Amagagasi aqukethe ukucindezela nokwandisa abizwa ngokuthi amagagasi...
A. okuphambene
B. i-electromagnetic
C. ubude
D. omakhenikha
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Ngokusekelwe endaweni yokusabalalisa, amagagasi ahlukaniswe izinhlobo ezimbili: amagagasi omshini kanye namagagasi kagesi . Amagagasi omshini adinga indawo yokuhambisa ukuze ahambe esuka endaweni eyodwa aye kwenye, kuyilapho amagagasi kagesi angahamba ngaphandle kwendawo yokuhambisa.
Amagagasi omshini ahlukene izinhlobo ezimbili: amagagasi ajikelezayo kanye namagagasi amade . Amagagasi ajikelezayo angamagagasi lapho indlela yokudlidliza kwe-medium iqonde ngqo endleleni yokusabalala kwamagagasi. Amagagasi ajikelezayo anama-crests kanye nama-trough. Izibonelo zamagagasi ajikelezayo amagagasi olwandle kanye namagagasi ezintambo.
Amagagasi amade angamagagasi lapho indlela yokudlidliza kwe-medium ihambisana nendlela yokusabalala kwamagagasi. Amagagasi amade abonisa ukucindezelwa kanye nokucindezelwa. Isibonelo segagasi elide igagasi lomsindo.
Impendulo efanele ngu-C.
7. Iphimbo lentambo liyakhula uma...
A. Ubude bentambo buyandiswa futhi indawo enqamulayo yentambo iyancipha
B. Ukuqina nobude bentambo kuncishisiwe.
C. Ukuqina kanye nendawo enqamula intambo kuyanda
D. ubude bentambo buncishisiwe futhi ukucindezeleka kwentambo kuyanda
Ingxoxo
Ifomula yesivinini sokusabalala kwamagagasi entanjeni:
Imininingwane:
v = isivinini sokusabalala kwamagagasi entanjeni, F = amandla okucindezela entanjeni, μ = ubukhulu bentambo = isisindo / ubude beyunithi yentambo ( μ = m/L)
Izintambo zomculo eziningi, njengezigitari nama-violin, zinezinhlangothi zombili eziboshwe ndawonye. Izintambo zingakhiqiza imisindo ehlukahlukene ngenxa yamagagasi amile awenzayo.
Ifomula echaza ubudlelwano phakathi kobude bentambo (L), ubude be-wavelength ( λ ) noma imvamisa yomsindo (f) okhiqizwa yintambo enezinhlangothi ezimbili eziboshwe yile:
Ngokusekelwe kuzibalo 1 no-2, kuphethwa ngokuthi imvamisa noma ukuphakama kwentambo kukhulu uma:
1. Ubude bentambo buyancipha (u-L uba mncane) —-> Isibalo 1
2. Amandla okucindezela kwentambo ayanda (u-F uba mkhulu) —-> Isibalo 2
Impendulo efanele ngu-D.
8. Bheka isithombe esilandelayo samagagasi! Ubude be-wavelength...
A. 6 cm
B. 8 cm
C. 10 cm
D. 15 cm
Ingxoxo
Kunama-wavelength angu-2,5 (amagquma amathathu nezigodi ezimbili) anobude obungu-15 cm, ngakho-ke ubude be-wavelength eyodwa bungu-15 cm / 2,5 = 6 cm.
Impendulo efanele ngu-A.
9. Isithombe esingezansi sibonisa inani lamagagasi anqamulayo amaningi njenga….
A. 1,5
B. 2,0
C. 2,5
D. 3,0
Ingxoxo
Igagasi elihambayo linegquma elilodwa kanye nomgodi owodwa wamagagasi. Ngokusekelwe esithombeni esingenhla, kunegagasi elihambayo elingu-2,5.
Impendulo efanele ngu-C.
10. Bheka isithombe esilandelayo! Ubude be-wavelength obulodwa...
A. a – g
B. a – d
C. c – g
D. c – f
Ingxoxo
Ubude obulodwa bewave bunegquma elilodwa lamagagasi kanye nesigodi esisodwa samagagasi.
ubude be-wavelength obubodwa = ae = bf = cg
Impendulo efanele ngu-C.
11. Igagasi elilodwa…
A. A – B – C – D
B. A – B – C
C. A – C – D
D. A – B – C – D – A
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Igagasi elilodwa noma ubude obulodwa bomkhathi bunegquma elilodwa kanye nesigodi esisodwa. Ngokusekelwe esithombeni esingenhla, ubude obulodwa bomkhathi buyi-ABC kanye ne-BCD.
Impendulo efanele ingu-B.
12. Intambo encane ixhunywe entanjeni ebanzi bese iboshelwa odongeni oluqinile, njengoba kuboniswe esithombeni. Uma ingxenye eyodwa yentambo encane iphazamiseka, igagasi lizoqhubekela ngakwesokudla. Okwamanje ku-A…
A. Amanye amagagasi ayadluliselwa kanti amanye abonakaliswa ngesigaba esifanayo negagasi elizayo.
B. Wonke amagagasi adluliselwa ku-B
C. Amanye amagagasi ayadluliselwa kanti amanye ayabonakaliswa
D. Wonke amagagasi ayabonakaliswa
E. Amaza okukhanya abonakalisiwe nadluliselwayo ayafana
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Impendulo efanele ngu-A.
13. Umuntu umemeza kakhulu phakathi kwamagquma amabili aphakeme. Ngemva kwemizuzwana embalwa umuntu uzwa ama-echo amabili, elilodwa ngemva kwemizuzwana emi-3 kanti elinye ngemva kwemizuzwana emi-4 yokumemeza. Isivinini somsindo emoyeni ngaleso sikhathi singama-340 m/s.
Ibanga eliphakathi kwala mawa amabili…
A. 170 m
B. 510 m
C. 1.190 m
D. 1.700 m
Ingxoxo
Kuyaziwa ukuthi:
Isivinini somsindo emoyeni (v) = 340 m/s
Isikhathi 1 (t 1 ) = imizuzwana emi-3 / 2 = imizuzwana emi-1,5
Isikhathi 2 (t 2 ) = imizuzwana emi-4 / 2 = imizuzwana emi-2
Isikhathi esiphelele (t) = imizuzwana eyi-1,5 + imizuzwana emi-2 = imizuzwana emi-3,5
Okufunwayo: Ibanga eliphakathi kwamagquma amabili
Impendulo:
v = s/t
s = vt = (340 m/s)(3,5 s) = 1.190 amamitha
Impendulo efanele ngu-C.
Umthombo wombuzo:
Imibuzo Yokuhlolwa Kazwelonke Yesayensi Yesikole Samabanga Aphansi/Isikole SamaSulumane Samabanga Aphakeme
Imibuzo yeFiziksi ye-SBMPTN
