1. He pōro e piri ana ki te pito o te taura whakapae, e hurihia ana i roto i tētahi porowhita he 20 cm te whānui o te pūtoro. E 360° te porowhita i ia hekona. Tātaihia te rahi o te whakaterenga pūwaenga!
Mōhiotia:
Tere koki (ω ) = 360 o /hekona = 1 hurihanga/hekona = 6.28 rātiana/hekona
Pūtoro (r) = 20 henemita = 0.2 m
E hiahiatia ana: Te whakaterenga ā-pokapū (a r )
Rongoā:
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 = whakaterenga ā-pokapū, v = tere rārangi, r = pūtoro, ω = tere koki
Te rahi o te whakaterenga pokapū :
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. E hurihuri ana tētahi wira, he 30 cm te whānui o tōna radius, i te tere o te 180 rpm. Tātaihia te whakaterenga ā-pokapū o tētahi pūwāhi i te taha o te wira!
Mōhiotia:
Pūtoro (r) = 30 henimita = 0.3 m
Tere koki ( ω ) = 180 hurihanga / 60 hēkona = 3 hurihanga / hēkona = (3)(6.28 rātiana) / hēkona = 18.84 rātiana/hēkona
E hiahiatia ana: te whakaterenga ā-pokapū ( a r ) o r = 0.3 m
Rongoā:
Te rahi o te whakaterenga pokapū:
a r = r ω 2
a r = (0.3 m)(18.84 rad/s)
a r = 5.65 m/s 2
3. E neke ana tētahi waka reihi i runga i tētahi ara porowhita he 50 mita te whānui. Mena he 72 km/h te tere o te waka, tautuhia te kaha o te whakaterenga ā-pokapū!
Mōhiotia:
Pūtoro (r) = 50 mita
Tere (v) = 72 km/h = (72)(1000 mita) / 3600 hēkona = 20 mita/hēkona
E hiahiatia ana : te rahi o te whakaterenga porotītaha (a r )
Rongoā:
a r = v2 / r = 202 / 50 = 400 / 50 = 8 m/ s2
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4. Ko te tere whakaterenga pūrua mōrahi o tētahi motuka he 10 m/s² , nō reira ka taea e te motuka te huri me te kore e paheke i waho o te ara piko. Mena kei te neke te motuka i te tere pumau 108 km/h, he aha te radius o te piko kore-piko?
Mōhiotia:
Te whakaterenga ā-pokapū (a r ) = 10 m/s 2
Te tere o te motuka (v) = 108 km/ h = (108)(1000) / 3600 = 30 mita s /h i runga i te d
E hiahiatia ana: te pūtoro (r)
Rongoā:
r = v 2 / a r
r = 30 2 / 10 = 900 / 10 = 90 mita s
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- Te huri i ngā waeine koki hei tauira mō ngā raruraru me ngā otinga
- Ngā tauira raruraru me ngā otinga mō te nekehanga koki me te nekehanga rārangi
- Ngā tauira rapanga tere koki me te tere raina me ngā otinga
- Ngā tauira rapanga whakaterenga koki me te whakaterenga raina me ngā otinga
- Ngā tauira rapanga nekehanga porowhita ōrite me ngā otinga
- Ngā raruraru tauira whakaterenga pūrua me ngā otinga
- Ngā tauira o ngā nekehanga porowhita kore-taurite me ngā otinga
