Mana - nā pilikia a me nā hoʻonā

ʻO ka mana ka wikiwiki o ka hana ʻana i ka hana i loko o kahi manawa i hāʻawi ʻia. Ma ke ʻano makemakika, ʻo ka mana ka lakio hana/manawa.

P = W/t

Wehewehe: P = mana (Joule/kekona = Watt), W = hana (Joule), t = manawa (kekona)

Ma muli o kēia kaulike, hiki ke hoʻoholo ʻia ʻo ka nui o ka hana, ʻo ka nui o ka mana. Ma ka ʻaoʻao ʻē aʻe, ʻo ka liʻiliʻi o ka hana, ʻo ka liʻiliʻi o ka mana. ʻO ka hana e pili ana i ka hana.

He scalar ka mana. ʻO ke anakahi SI o ka mana ʻo Joule/kekona. ʻO ka Joule/kekona = Watt (i hoʻopōkole ʻia ʻo W), i kapa ʻia pēlā e hoʻohanohano iā James Watt. ʻO ke anakahi imperial Pelekane no ka mana he kapuaʻi-paona i kekona.

He liʻiliʻi loa kēia ʻāpana no nā hana pono, no laila ua hoʻohana ʻia ka ʻāpana horsepower nui aʻe (i hoʻopōkole ʻia e like me hp). Hoʻokahi horsepower = 550 kapuaʻi-paona i kekona = 764 Watts = ¾ kilowatt.

Hiki ke hōʻike ʻia ka nui o ka hana ma nā anakahi mana x manawa, no ka laʻana, kilowatt-hola a i ʻole kWh. ʻO hoʻokahi kWh e pili ana i ka hana i hana ʻia ma ka wikiwiki mau o 1 kiloWatt no hoʻokahi hola.

1. He 50-kg holo ke kanaka i luna o ke alapiʻi he 10 mika ke kiʻekiʻe in 2 minuke. Ahoʻolalelale ma muli o ʻo ke kaumaha (g) he 10 m/s². E hoʻoholo i ka mana.

ʻIke ʻia:

Ka Mass (m) = 50 kg

kiʻekiʻe (h) = 10 mikalehua

ʻO ka wikiwiki ma muli o ka umekaumaha (g) = 10 m/s²

manawa wā mawaena (t) = 2 minuke = 2 (60) = 120 ka luas

makemake : mana (P)

Lōlā:

Haʻilula o ka mana:

P = W / t

P= mana, W = hana, t = manawa

Ke ʻano o ka hana:

W = Fs = wh = mgh

W= hana, F = ikaika, w = kaumaha, d = ka haʻalele, h = kiʻekiʻe, m = ka nuipaʻa, g = ka wikiwiki ma muli o ka umekaumaha

W = mgh = (50)(10)(10) = 5000 Joules.

P = W / t = 5000 / 120 = 41.7 Joule/second.

2. E helu i ka mana e pono ai no ke kanaka 60-kg e piʻi ana i kahi lāʻau he 5 mika ke kiʻekiʻe i loko o 10 kekona. ʻO ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s².

ʻIke ʻia:

Nuipaʻa (m) = 60 kg

kiʻekiʻe (h) = 5 mikas

ʻO ka wikiwiki ma muli o ka umekaumaha (g) = 10 m/s²

manawa wā mawaena (t) = 10 kekona

makemake : mana

Lōlā:

Hana:

W = mgh = (60)(10)(5) = 3000 Joules

Kaha:

P = W / t = 3000 / 10 = 300 Joule/sekūlana

3. He keaka hoʻokani wili me ka mana o 300 watts a me ka manawa o 5 mau minuke e hoʻohuli ana i 5 mau puni. ʻO ka ikehu e hoʻohana ai….

A. 15 kJ

B. 75 kJ

C. 90 kJ

D. 450 kJ

ʻIke ʻia:

Mana (P) = 300 Watts = 300 Joules/kekona

Ka Wā (T) = 5 mau minuke = 5 (60 kekona) = 300 kekona

Helu o nā hoʻohuli = 5

Makemake: Ikehu i hoʻohana ʻia e ka ʻakaʻaka rotary

Lōlā:

ʻO D ka pane pololei.

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1. Ua hana ʻia ka hana ma o ka ikaika i nā pilikia a me nā hoʻonā
2. Nā pilikia a me nā hoʻonā o ka ikehu hana-kinetic
3. Nā pilikia a me nā hoʻonā i nā kumumanaʻo ikehu hana-mekanika
4. Nā pilikia ikehu hiki ke umekaumaha a me nā hoʻonā
5. ʻO ka ikehu hiki ke loaʻa i nā pilikia a me nā hoʻonā o ka pūnāwai elastic
6. Nā pilikia mana a me nā hoʻonā
7. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe hāʻule manuahi
8. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana i luna a i lalo i ka neʻe hāʻule manuahi
9. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana ma luna o kahi ʻili kūlou
10. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana ma kahi mokulele inclined
11. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana o ka projectile