Mehlala e 7 ea motsamao o chitja o fetohang ka ho lekana
1. Propeller e phomotseng qalong, e potoloha ka lebelo le sa fetoheng la 2 rad/s.2Fumana lebelo la angular le lebelo la angular la propeller metsotsoana e 2 hamorao. Li hlalose ka li-radian le metsotsoana.
Puisano
Hoa tsebahala :
E botsitsoe : ho potlaka ha angular le lebelo la angular kamora metsotsoana e 2
Jawab :
(A) Ho potlaka ha Angular kamora metsotsoana e 2
Ho potlaka ha angular ho dula ho le teng ka hona, kamora metsotsoana e 2, ho potlaka ha angular ho dula ho le 2 rad/s2.
(B) Lebelo la angular kamora metsotsoana e 2
Ho potlaka ha Angular 2 rad/s2 = 2 radians/motsotswana ka motsotsoana ho bolela hore lebelo la angular le eketseha ka 2 radians/motsotswana motsotsoana o mong le o mong. Kamora motsotsoana o le mong, lebelo la angular le fetoha 2 radians/motsotswana. Kamora metsotsoana e 2, lebelo la angular le fetoha 4 radians/motsotswana.
2. Lebili le phomotseng qalong le potlakisa ka ho lekana. Kamora metsotsoana e 10, lebili le potoloha ka lebelo le potolohang la 60 rpm. Fumana lebelo le potolohang la lebili!
Puisano
Jawab :
Foromo ea motsamao o chitja o potlakileng ka ho lekana (GMBB) e ts'oana le foromo ea motsamao o otlolohileng o potlakileng ka ho lekana (GLBB).
Ho potlaka ha lebili ka tsela e potolohang ke 0,628 rad/s2
3. Lebelo la angular la silindara le fetoha ka ho lekana ho tloha ho 20 rad/s ho isa ho 10 rad/s ka metsotsoana e 4. Fumana lebelo la angular la silindara!
Puisano
Jawab :
Ho potlaka ha silindara ka lehlakoreng le leng ke -2,5 rad/s2Letšoao le fosahetseng = ho potlaka kapa ho fokotseha ha lebelo. Haeba ho potlaka, lebelo la angular lea eketseha, joale ho phokotseheng ha lebelo, lebelo la angular lea fokotseha.
4. Ntho e qalang ho potoloha ka lebelo la angular la 10 rad/s e ba le lebelo le sa fetoheng la angular la 2 rad/s.2Fumana sekhutlo se potileng ntho ka mora metsotsoana e 2!
Puisano
5. Lebili la koloi le qalang ho potoloha ka lebelo le potolohang la 20 rad/s le emisa ho potoloha ka mora ho tsamaya ka lehlakoreng la 20 radians. Ho potlaka ha lebili ka lehlakoreng ke…
Puisano
Jawab :
Potso ena e rarolloa ka ho sebelisa foromo ea 3.
6. Lipotso tsa Tlhahlobo ea Naha ea 1999/2000 P4 No. 26
PQ ea molamu e bolelele ba 60 cm e potoloha ntlha ea Q e le mothapo le PQ e le radius ea potoloho. PQ ea molamu e potoloha ho tloha phomolong ka lebelo la angular la 0,3 rad s.-2Haeba boemo ba pele ba angular = 0, joale lebelo la mola (v) la pheletso ea P ka nako ea t = metsotsoana e 10 ke...
A. 1,8 ms -1
B. 3 ms -1
C. 5 ms -1
D. 30 ms -1
E. 180 ms -1
Puisano
Hoa tsebahala hore:
Bolelele ba thupa PQ = radius ea selikalikoe (r) = 60 cm = 60/100 m = 0,60 metres
Lebelo la pele la angular (ωo) = 0 rad/s
Ho potlaka ha Angular (α) = 0,3 rad s-2
Boemo ba pele ba angular (θo= 0
O botsitse: Lebelo la mola (v) la pheletso P ka nako t = metsotsoana e 10
Karabo:
Pele bala lebelo la angular la thupa ka nako t metsotsoana e 10.
Foromo ea Motsamao o Potlakileng oa Selikalikoe ka Tsela e Tšoanang:
ωt = ωo + α t = 0 rad/s + (0,3 rad s-2(metsotsoana e 10) = 3 rad s-1
Lebelo la angular ho t = metsotsoana e 10 ke radians tse 3/motsotsoana.
Lebelo le otlolohileng ho t = metsotsoana e 10 le baloa ho sebelisoa foromo ea kamano pakeng tsa lebelo le otlolohileng (v), lebelo la angular (ω) le radius (r).
v = r ω = (limithara tse 0,6)(li-radian tse 3/motsotswana) = limithara tse 1,8/motsotswana.
Karabo e nepahetseng ke A.
7. Lipotso tsa Tlhahlobo ea Naha ea 2002/2003
Ntho e tsamaya ka sedikadikwe ka lebelo la pele la 4 rad/s mme e ba le lebelo la angular la 0,5 rad/s2 Kahoo lebelo la ntho motsotswaneng wa bone ke...
A. 4,0 rad/s
B. 4,5 rad/s
C. 5,0 rad/s
D. 6,0 rad/s
E. 8,0 rad/s
Puisano
Hoa tsebahala hore:
Lebelo la pele la angular (ωo) = 4 radians/motsotswana
Ho potlaka ha Angular (α) = 0,5 rad/s2
Nako ea ho arohana (t) = metsotsoana e 4
O botsitse: Lebelo la ntho motsotswaneng wa bone (ωt)
Karabo:
Foromo ea ho fetola motsamao o chitja ka ho lekana:
ωt = ωo + α t
ωt = 4 + (0,5)(4)
ωt = 4 + 2
ωt = Li-radian tse 6/motsotsoana
Karabo e nepahetseng ke D.
