1. Ijubane legagasi eliphambene entanjeni engamamitha angu-25 lingu-50 m/s. Amandla okucindezela entambo angama-200 N. Thola isisindo sentambo.
A. 0.08 kg
B. 0.5 kg
C. 0.8 kg
D. 2.0 kg
Kwaziwa:
Ubude bentambo (l) = 25 m
Isivinini segagasi eliphambene (v) = 50 m/s
Amandla okucindezela entambo (T) = 200 N
Okufunwayo: Isisindo sentambo (m)
Isixazululo:
Le nkinga ingaxazululwa kusetshenziswa ifomula yefomula yokusabalala kwamagagasi entanjeni.
Impendulo efanele ngu-D.
2. Phezu kwechibi kuntanta izingcezu ezimbili zokhuni, ibanga eliphakathi kwazo liyimitha eyi-6. Amagagasi asakazeka phezu kwechibi. Lapho ukhuni lokuqala seluhambe phezulu naphansi kathathu, ukhuni lwesibili luhamba phezulu naphansi kanye kuphela. Uma njalo ngemizuzwana emi-2 zombili izinhlobo zokhuni zihamba phezulu naphansi kathathu, ukusabalala kwamagagasi ku...
A. 4.5 m/s
B. 3.0 m/s
C. 2.0 m/s
D. 1.5 m/s
Kwaziwa:
Ibanga phakathi kwezinkuni zombili (l) = amamitha ayi-6
Ukhuni lokuqala selukhuphuke futhi lwehle kathathu; ukhuni lwesibili selukhuphuke futhi lwehle kanye.
Imvamisa (f) = 3 / 2 = 1.5 hertz
Okufunwayo: Isivinini segagasi (v)
Isixazululo:
Uma ukhuni lokuqala luhamba phezulu naphansi kanye, ubude besikhathi 1 buyahamba luye okhunini lwesibili. Uma ukhuni lokuqala luhamba phezulu naphansi kabili, ubude besikhathi 2 buyahamba luye okhunini lwesibili. Uma ukhuni lokuqala luhamba phezulu naphansi kathathu, ubude besikhathi bufika endaweni yesibili yokhuni, ukuze ngesikhathi esifanayo ukhuni lwesibili luhambe phezulu naphansi kanye.
Ngakho, i ibanga phakathi kokhuni lokuqala nokhuni lwesibili kukhona amaza amabili (2 λ), njengoba kuboniswe esithombeni ohlangothini.
Ibanga lobude be-wavelength obungu-1 (λ) = 6/2 = amamitha angu-3
Isivinini sokusabalala kwamagagasi (v):
v = f λ = (1.5 hertz)(3 amamitha)
v = 4.5 m/s
Impendulo eyiyo ngu-A.
3. Izici ezisheshisa ukusabalala kwamagagasi ezintanjeni yilezi…
(1) khulisa ucingo
(2) ukukhulisa ubukhulu bentambo
(3) khulisa ukucindezeleka kwentambo
(4) khulisa usayizi wentambo Isitatimende esifanele sithi…
A. (1), (2), (3) kanye no (4)
B. (1), (2), kanye (3)
C. (3) kanye no-(4)
D. (3) kuphela
Isixazululo:
Ifomula yesivinini sokusabalala kwamagagasi ezintanjeni:
Impendulo eyiyo ngu-A.
v = isivinini sokusabalala kwamagagasi ezintanjeni
T = amandla okucindezela kwezintambo
μ = ubuningi bentambo
m = isisindo sentambo
l = ubude bentambo
4. Entanjeni kukhula intambo yobude besikhathi enobude obungu-50 Hz kanye nobude besikhathi obungu-2 m. Isikhathi kanye nesivinini segagasi…
A. Imizuzwana engu-0.02 kanye ne-50 ms -1
B. 0.02 imizuzwana kanye ne-100 ms -1
C. 0.04 imizuzwana kanye no-50 ms -1
D. 0.5 imizuzwana kanye ne-100 ms -1
Kwaziwa:
Imvamisa (f) = 50 Hz
Ubude be-wavelength (λ) = amamitha ama-2
Okufunwayo: Isikhathi (T) kanye nesivinini segagasi (v)
Isixazululo:
Isikhathi:
T = 1/f = 1/50 Hz = 0.02 imizuzwana
Isivinini segagasi:
v = f λ = (50 1/isekhondi)(2 amamitha) = 100 amamitha/isekhondi
Impendulo efanele ngu-B.
5. Ikhoki ebusweni bamanzi iya phezulu naphansi ngenxa yamagagasi amanzi angaphezulu. Isikhathi esidingekayo kusukela eqongeni kuya eqongeni elilandelayo yimizuzwana eyi-1.2. Uma ebusweni bamanzi, ibanga phakathi kwamagagasi amabili lingu-10 cm, khona-ke nquma ijubane lokusabalala kwamagagasi.
A. 12 ms -1
B. 12 cm s -1
C. 8,3 ms -1
D. 8,3 cm s -1
Kwaziwa:
Isikhathi esidingekayo kusukela eqongeni kuya eqongeni elilandelayo = isikhathi sobude be-wavelength eyodwa = isikhathi (T) = imizuzwana eyi-1.2.
Ibanga eliphakathi kwama-crests amabili = ibanga lobude obungu-1 (λ) = 10 cm
Okufunwayo: Isivinini sokusabalala kwamagagasi (v)
Isixazululo:
Isivinini sokusabalala kwamagagasi:
v = f λ = λ / T = 10 cm / 1.2 imizuzwana = 8.3 cm/isekhondi = 8.3 cm.s -1
Impendulo efanele ngu-D.
