Isibonelo samagagasi amile namagagasi amile

4 Izibonelo zamagagasi amile namagagasi amile

1. Intambo ingamamitha angu-0,6 ubude. Uma ukucindezeleka kwentambo kulungiswa ukuze ijubane lamagagasi libe ngu-120 m/s, khona-ke imvamisa eyisisekelo...
I-A. 100 Hz
B. 120 Hz
C. 140 Hz
D. 150 Hz
I-E. 350 Hz
Ingxoxo:

I-Diketahui :
Ubude bentambo (L) = amamitha angu-0,6
Isivinini samagagasi (v) = 120 m/s.
Kubuziwe :
Imvamisa eyisisekelo (f)₁)?
Jawab :
Ifomula yemvamisa eyisisekelo (f)₁) amagagasi anganyakazi noma amagagasi amile lapho zombili izinhlangothi zentambo zinamathele khona:
f₁ = v / 2L
Imvamisa eyisisekelo (f)₁) amagagasi yilawa:
f₁ = 120 / (2)(0,6) = 120 / 1,2 = 100 hz
Impendulo efanele ngu-A.

2. Ngenxa yokuzindla, kwakheka igagasi elingashintshi eline-equation: y = 0,4 sin (0,6 π x) cos π(8t) amamitha. Kusukela ku-equation engenhla, ijubane legagasi elibonakalayo...
A. 10,0 m/s
B. 11,5 m/s
C. 12,4 m/s
D. 13,2 m/s
E. 14,0 m/s
Ingxoxo:
I-Diketahui :
Kubuziwe :
Isivinini segagasi esibonisiwe (v) ?
Jawab :

Impendulo efanele ngu-D.

3. Intambo engu-3 m ubude iboshiwe kolunye uhlangothi bese ixhunywe ku-vibrator kolunye. Uma i-vibrator idlidlizwa, kwakheka igagasi elimile entanjeni njengoba kuboniswe esithombeni:

Indawo yesisu sesi-5 kusukela ekugcineni okuboshwe yi...

A. 0,9 m

B. 1,2 m

C. 2,5 m

D. 2,7 m

E. 3,0 m

Ingxoxo

Isiphelo sentambo exhunywe ku-vibrator singahamba ngokukhululeka kuyilapho isiphelo sentambo exhunywe esigxotsheni siboshiwe.

Ibanga phakathi kwama-node amabili aseduze = amamitha angu-3 / 5 = amamitha angu-3/5.

Indawo yefindo lokuqala kusukela ekugcineni okuboshiwe = 3/5 amamitha

Indawo yefindo lesibili kusukela ekugcineni okuboshiwe = 2 (3/5 imitha) = 6/5 amamitha

Indawo yefindo lesibili kusukela ekugcineni okuboshiwe = 3 (3/5 imitha) = 9/5 amamitha

Indawo yefindo lesibili kusukela ekugcineni okuboshiwe = 4 (3/5 imitha) = 12/5 amamitha

Ibanga eliphakathi kwe-node eyodwa nesisu esiseduze = 1/2 (3/5 imitha) = 3/10 imitha.

Indawo yesisu sesi-5 ukusuka ekugcineni okuboshwe = ibanga lefindo lesi-4 ukusuka ekugcineni okuboshwe + Ibanga eliphakathi kwe-node eyodwa nesisu esisodwa esiseduze = 12/5 + 3/10 = 24/10 + 3/10 = 27/10 = 2,7 amamitha.

Impendulo efanele ngu-D.

4. Ekuhlolweni kukaMelde, kutholakale igagasi elingashintshi njengoba kuboniswe esithombeni. Uma ubude bentambo esetshenzisiwe buyi-1,5 m, khona-ke indawo yenodi yesine ebalwe kusukela emthonjeni wokudlidliza…

A. 0,40 m

B. 0,54 m

C. 0,96 m

D. 1,02 m

E. 1,10 m

Ingxoxo

Ibanga phakathi kwama-node amabili aseduze = amamitha angu-1,5 / 11 = amamitha angu-1,5/11.

Indawo ye-node 1 kusuka emthonjeni wokudlidliza = 1,5/11 amamitha

Indawo yenodi yesibili evela emthonjeni wokudlidliza = 2 (1,5/11 metres) = 3/11 metres

Indawo yenodi yesibili evela emthonjeni wokudlidliza = 3 (1,5/11 metres) = 4,5/11 metres

Indawo yenodi yesi-4 kusukela emthonjeni wokudlidliza = 4 (1,5/11 amamitha) = 6/11 amamitha = 0,54 amamitha

Impendulo efanele ingu-B.