1. Into iyadlidliza ngemvamisa engu-5 Hz iye kwesokudla nakwesobunxele. Into isuka endaweni yokulingana iye ekufudukeni okuphezulu ngakwesokudla . Thola isikhathi esidingekayo ukuze ufinyelele ekufudukeni okuphezulu ngakwesokudla izikhathi eziyishumi nanye.
A. 2.05
B. 2.20
C. 2.25
D. 2.50
Kwaziwa:
Imvamisa (f) = inani lokudlidliza kwesekhondi eli-1 = 5 Hz
Inkathi (T) = isikhathi sokuphumula sokwenza ukudlidliza okukodwa = 1/f = 1/5 = 0.2 imizuzwana
Okufunwayo: Isikhathi esidingekayo ukuze kufinyelelwe ukufuduka okuphezulu ngakwesokudla izikhathi eziyishumi nanye
Isixazululo:
Iphethini yokudlidliza kwento:
(1 ukudlidliza) : B → C → B → A → B
Kokudlidliza okukodwa, into yenza ukudlidliza okune okungu-B kuya ku-C, C kuya ku-B, B kuya ku-A, A kuya ku-B. Isikhathi esidingekayo sokudlidliza okukodwa singamasekhondi angu-0.2 / 4 = amasekhondi angu-0.05.
Isikhathi esidingekayo ukuze kufinyelelwe ukufuduka okuphezulu kakhulu ngakwesokudla izikhathi eziyishumi nanye = (imizuzwana eyi-10 x 0.2) + imizuzwana engu-0.05 = imizuzwana emi-2 + imizuzwana engu-0.05 = imizuzwana engu-2.05.
Impendulo eyiyo ngu-A.
2. Isipilingi silenga nento bese siyanyakaziswa. Ukuze imvamisa yokudlidliza iphindwe kabili imvamisa yokudlidliza yokuqala, khona-ke isisindo sento siyashintshwa sibe…
A. kabili isisindo somthwalo wokuqala
B. isisindo esiphindwe kane kunomthwalo wokuqala
C. isigamu sesikhathi sesisindo somthwalo
D. ingxenye yesine yesisindo somthwalo wokuqala
Isixazululo:
Isibalo semvamisa yokudlidliza kwentwasahlobo:
f = imvamisa, k = okungaguquki, m = isisindo sento
Imvamisa (f) yokudlidliza kwentwasahlobo uma u-k = isikhathi esingu-1, m = isikhathi esingu-1:
Ukuze imvamisa yokudlidliza kwentwasahlobo (f) ibe kabili, isisindo (m) sishintshwa sibe izikhathi ezingu-0.25 noma izikhathi ezingu-1/4:
Impendulo efanele ngu-D.
3. Isipilingi esine-k engaguquki = 1000 N/m silenga nento enesisindo esingamagremu angu-400. Into idonswa ngakwesokudla kuze kufike ku-5 cm, bese idedelwa, ukuze into ibe ama-harmonics aguquguqukayo alula . Nquma ubukhulu kanye nemvamisa yokuguquguquka kwento.
Kwaziwa:
I-constant yaseNtwasahlobo (k) = 1000 N/m
Isisindo sento (m) = 400 amagremu = 0.4 kg
Ububanzi (Δx) = 5 cm = 0.05 m
Okufunwayo: Ubukhulu kanye nokuvama kokunyakaza
Isixazululo:
Ubukhulu bokushukuma kwentwasahlobo = Δx = 5 cm.
Imvamisa yokunyakaza:
Impendulo efanele ngu-B.
