1. Liwiro la mafunde opingasa Pa chingwe cha mamita 25 ndi 50 m/s. Mphamvu ya kukakamira kwa chingwe ndi 200 N. Dziwani kulemera kwa chingwe.
A. 0.08 kg
B. 0.5 kg
C. 0.8 kg
D. 2.0 kg
Zodziwika:
Kutalika kwa chingwe (l) = 25 m
Liwiro la mafunde opingasa (v) = 50 m/s
Mphamvu ya chingwe (T) = 200 N
SE basi: Kulemera kwa chingwe (m)
Yankho:
Vutoli lingathe kuthetsedwa pogwiritsa ntchito njira yofalitsira mafunde pa chingwe.
Yankho lolondola ndi D.
2. Pamwamba pa nyanjayi pali matabwa awiri oyandama, mtunda pakati pawo ndi mamita 6. Mafunde amafalikira pamwamba pa nyanjayi. Mitengo yoyamba ikakwera ndi kutsika katatu, mitengo yachiwiri imakwera ndi kutsika kamodzi kokha. Ngati masekondi awiri aliwonse mitundu yonse ya matabwa imakwera ndi kutsika katatu, kufalikira kwa mafunde kumakhala ...
A. 4.5 m/s
B. 3.0 m/s
C. 2.0 m/s
D. 1.5 m/s
Zodziwika:
Mtunda pakati pa matabwa onse awiri (l) = mamita 6
Matabwa oyamba asunthika mmwamba ndi pansi katatu; matabwa achiwiri asunthika mmwamba ndi pansi kamodzi.
Kuchuluka kwa nthawi (f) = 3 / 2 = 1.5 hertz
SE basi: Liwiro la mafunde (v)
Yankho:
Mtengo woyamba ukakwera ndi kutsika kamodzi, timaganiza Mtengo umodzi umapita ku mtengo wachiwiri. Mtengo woyamba ukakwera ndi kutsika kawiri, kutalika kwa thambo 2 umapita ku mtengo wachiwiri. Mtengo woyamba ukakwera ndi kutsika katatu, kutalika kwa thambo kumakhala kuti kwafika pamalo achiwiri a matabwa, kotero kuti nthawi yomweyo mtengo wachiwiri umakwera ndi kutsika kamodzi.
Choncho, a mtunda Pakati pa matabwa oyamba ndi matabwa achiwiri pali mafunde awiri (2 λ), monga momwe chithunzi chili m'mbali chikusonyezera.
Mtunda wa kutalika kwa 1 wavelength (λ) = 6 / 2 = mamita atatu
Liwiro la kufalikira kwa mafunde (v):
v = f λ = (1.5 hertz) (3 mita)
v = 4.5 m/s
Yankho lolondola ndi A.
3. Zinthu zomwe zimathandizira kufalikira kwa mafunde pa zingwe ndi…
(1) kulitsa waya
(2) kukulitsa waya
(3) kuonjezera mphamvu ya waya
(4) kukulitsa kukula kwa waya. Chiganizo cholondola ndi…
A. (1), (2), (3) ndi (4)
B. (1), (2), ndi (3)
C. (3) ndi (4)
D. (3) yokha
Yankho:
Fomula ya liwiro la kufalikira kwa mafunde pa zingwe:
Yankho lolondola ndi A.
v = liwiro la kufalikira kwa mafunde pa zingwe
T = mphamvu ya zingwe zomangika
μ = kuchuluka kwa chingwe
m = kulemera kwa chingwe
l = kutalika kwa chingwe
4. Pa chingwe, chingwe cha kutalika kwa mafunde chimakhala ndi mafunde a 50 Hz ndi mafunde a 2 m. Nthawi ndi liwiro la mafunde ndi…
A. Masekondi 0.02 ndi 50 ms-1
B. Masekondi 0.02 ndi 100 ms-1
C. masekondi 0.04 ndi 50 ms-1
D. Masekondi 0.5 ndi 100 ms-1
Zodziwika:
Mafupipafupi (f) = 50 Hz
Kutalika kwa nthawi (λ) = mamita awiri
SE basi: Nthawi (T) ndi liwiro la mafunde (v)
Yankho:
Nthawi:
T = 1/f = 1/50 Hz = masekondi 0.02
Liwiro la mafunde:
v = f λ = (50 1/sekondi)(mamita awiri) = mamita 100/sekondi
Yankho lolondola ndi B.
5. Chokoka pamwamba pa madzi chimasuntha mmwamba ndi pansi chifukwa cha mafunde a madzi pamwamba. Nthawi yofunikira kuyambira chizindikiro cha chizindikiro cha chizindikiro china cha ines masekondi 1.2. Ngati pamwamba pa madzi, mtunda pakati pa ma crests awiri ndi 10 cm, ndiye kuti mudziwe liwiro la kufalikira kwa mafunde.
A. 12 ms-1
B. 12 cm s-1
C. 8,3 ms-1
D. 8,3 cm s-1
Zodziwika:
Nthawi yofunikira kuchokera pa crest kupita ku crest yotsatira = nthawi yopuma ya wavelength imodzi = nthawi (T) = masekondi 1.2.
Mtunda pakati pa ma crests awiri = mtunda wa kutalika kwa 1 wavelength (λ) = 10 cm
Akufuna: Liwiro la kufalikira kwa mafunde (v)
Yankho:
Liwiro la kufalikira kwa mafunde:
v = f λ = λ / T = 10 cm / 1.2 masekondi = 8.3 cm/sekondi = 8.3 cm.s-1
Yankho lolondola ndi D.
