Zitsanzo 4 za mafunde osasinthasintha ndi mafunde oyima
1. Chingwe chimakhala chautali wa mamita 0,6. Ngati mphamvu ya chingwe yasinthidwa kuti liwiro la mafunde likhale 120 m/s, ndiye kuti ma frequency oyambira ndi...
A. 100 Hz
B. 120 Hz
C. 140 Hz
D. 150 Hz
E. 350 Hz
Kukambirana:
Ndizodziwika kuti :
Utali wa waya (L) = mamita 0,6
Liwiro la mafunde (v) = 120 m/s.
Anafunsa :
Mafupipafupi oyambira (f)1)?
Yankhani :
Fomula yoyambira ya ma frequency (f)1) mafunde osasinthasintha kapena mafunde oyima pomwe malekezero onse awiri a chingwe amamangiriridwa:
f1 = v / 2L
Mafupipafupi oyambira (f)1mafunde ndi awa:
f1 = 120 / (2)(0,6) = 120 / 1,2 = 100 hz
Yankho lolondola ndi A.
2. Chifukwa cha kuwunikira, mafunde osasinthasintha amapangidwa ndi equation iyi: y = 0,4 sin (0,6 π x) cos π(8t) mamita. Kuchokera ku equation yomwe ili pamwambapa, liwiro la mafunde owunikira ndi...
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
Kukambirana:
Ndizodziwika kuti :
Anafunsa :
Liwiro la mafunde lowonetsedwa (v) ?
Yankhani :
Yankho lolondola ndi D.
3. Chingwe cha mamita atatu chachitali chimamangiriridwa kumapeto kwina ndipo kumapeto kwina kumalumikizidwa ndi vibrator. Pamene vibrator ikugwedezeka, mafunde osasuntha amapangidwa pa chingwecho monga momwe chithunzichi chikusonyezera:
Malo a mimba yachisanu kuchokera kumapeto omangiriridwa ndi…
A. 0,9 m
B. 1,2 m
C. 2,5 m
D. 2,7 m
E. 3,0 m
Zokambirana
Mapeto a chingwe cholumikizidwa ku vibrator amatha kuyenda momasuka pomwe mapeto a chingwe cholumikizidwa ku ndodo amangiriridwa.
Mtunda pakati pa ma node awiri apafupi = mamita 3 / 5 = mamita 3/5.
Malo a mfundo yoyamba kuchokera kumapeto omangiriridwa = mamita 3/5
Malo a fundo yachiwiri kuchokera kumapeto omangiriridwa = 2 (mita 3/5) = mamita 6/5
Malo a fundo yachiwiri kuchokera kumapeto omangiriridwa = 3 (mita 3/5) = mamita 9/5
Malo a fundo yachiwiri kuchokera kumapeto omangiriridwa = 4 (mita 3/5) = mamita 12/5
Mtunda pakati pa mfundo imodzi ndi mimba yapafupi = 1/2 (mita 3/5) = mita 3/10.
Malo a mimba yachisanu kuchokera kumapeto omangiriridwa = mtunda wa mfundo yachinayi kuchokera kumapeto omangiriridwa + Mtunda pakati pa mfundo imodzi ndi mimba yapafupi = 12/5 + 3/10 = 24/10 + 3/10 = 27/10 = mamita 2,7.
Yankho lolondola ndi D.
4. Mu kuyesera kwa Melde, mafunde osasuntha adapezeka monga momwe zasonyezedwera pachithunzichi. Ngati kutalika kwa chingwe chomwe chagwiritsidwa ntchito ndi 1,5 m, ndiye kuti malo a node yachinayi yowerengedwa kuchokera ku gwero la kugwedezeka ndi...
A. 0,40 m
B. 0,54 m
C. 0,96 m
D. 1,02 m
E. 1,10 m
Zokambirana
Mtunda pakati pa ma node awiri apafupi = mamita 1,5 / 11 = mamita 1,5/11.
Malo a node 1 kuchokera ku gwero la kugwedezeka = 1,5/11 mamita
Malo a node yachiwiri kuchokera ku gwero la kugwedezeka = 2 (1,5/11 mita) = 3/11 mita
Malo a node yachiwiri kuchokera ku gwero la kugwedezeka = 3 (1,5/11 mita) = 4,5/11 mita
Malo a node yachinayi kuchokera ku gwero la kugwedezeka = 4 (1,5/11 mamita) = 6/11 mamita = 0,54 mamita
Yankho lolondola ndi B.
