1. Bolo, e hoketsoeng pheletsong ea thapo e rapameng, e potoloha ka selikalikoe sa radius ea 20 cm. Bolo e potoloha 360 o motsotsoana o mong le o mong. Fumana boholo ba ho potlakisa ha centripetal!
Tse tsejoang:
Lebelo la Angular (ω ) = 360 o /motsotswana = 1 revolution/motsotswana = 6.28 radians/motsotswana
Radius (r) = 20 cm = 0.2 m
Ho batloa: Ho potlakisa centripetal (a r )
Tharollo:
a r = v 2 / r —> v = r ω
a r = (r ω) 2 / r = r 2 ω 2 / r
a r = r ω 2
a s = ho potlaka ha bohareng, v = lebelo le otlolohileng, r = radius, ω = lebelo la angular
Boholo ba ho potlaka ha centripetal :
a r = r ω 2 a r = (0,2 m)( 6.28 rad/s)
a r = 1.256 m/s 2
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2. Lebili la 30 cm ka radius le potoloha ka lebelo la 180 rpm. Fumana lebelo la bohareng ba ntlha e ka lehlakoreng la lebili!
Tse tsejoang:
Radius (r) = 30 cm = 0.3 m
Lebelo la Angular ( ω ) = diphetoho tse 180 / metsotsoana e 60 = diphetoho tse 3 / motsotsoana = (3)(di-radian tse 6.28) / motsotsoana = di-radian tse 18.84/motsotswana
Ho batloa: ho potlakisa bohareng ( a r ) ba r = 0.3 m
Tharollo:
Boholo ba ho potlaka ha centripetal:
a r = r ω 2
a r = (0.3 m)(18.84 rad/s)
a r = 5.65 m/s 2
3. Koloi ea mabelo e tsamaea tseleng e chitja ea radius ea limithara tse 50. Haeba lebelo la koloi e le 72 km/h, fumana boholo ba lebelo la centripetal!
Tse tsejoang:
Radius (r) = limithara tse 50
Lebelo (v) = 72 km/h = (72)(limithara tse 1000) / metsotsoana e 3600 = limithara tse 20/motsotsoana
Ho batloa : boholo ba ho potlaka ha centripetal (a r )
Tharollo:
a r = v 2 / r = 20 2 / 50 = 400 / 50 = 8 m/s 2
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4. Koloi e na le lebelo le phahameng ka ho fetisisa la centripetal la 10 m/s 2 , kahoo koloi e ka reteleha ntle le ho thella tseleng e kobehileng. Haeba koloi e tsamaea ka lebelo le sa fetoheng la 108 km/h, radius ea curve e sa kobehang ke efe?
Tse tsejoang:
Ho potlaka ha centripetal (a r ) = 10 m/s 2
Lebelo la koloi (v) = 108 km/ h = (108)(1000) / 3600 = 30 metres s /se c ho d
Ho batloa: radius (r)
Tharollo:
r = v 2 / a r
r = 30 2 / 10 = 900 / 10 = 90 limithara s
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- Mathata a sampole a diyuniti tsa dikhutlo a fetolang ka ditharollo
- Mathata le litharollo tsa sampole ea ho falla ka mokhoa o otlolohileng le oa ho falla ka mokhoa o otlolohileng
- Mathata a sampole ea lebelo la angular le lebelo le otlolohileng ka litharollo
- Mathata a mohlala oa ho potlakisa ka mokhoa o otlolohileng le oa ho potlakisa ka litharollo
- Mehlala ea mathata a metsamao e chitja e tšoanang ka litharollo
- Mathata a sampole ea ho potlakisa centripetal ka litharollo
- Mathata a sampole ea metsamao e chitja e sa tšoanelang ka litharollo
