ʻO ka nui a me ka lana ʻana ma ke kaulike - nā pilikia a me nā hoʻonā

ʻO ka nui a me ka lana ʻana ma ke kaulike - nā pilikia a me nā hoʻonā

1. He poloka i hoʻokomo ʻia i loko o ʻelua mau wai me nā ʻano like ʻole. I loko o nā wai A, aia ka hapa 0.6 o kahi mea i loko o ka wai. I loko o nā wai B, aia ka hapa 0.5 o kahi mea i loko o ka wai. E hoʻoholo i ka lakio o ka nui o ka wai A i ka wai B.

ʻIke ʻia:

Ka nui o ka poloka = x

ʻĀpana o ka mea i loko o ka wai A = 0.6

Ka nui o ke kinoea A = y

ʻĀpana o ka mea i loko o ka wai B = 0.5

Ka nui o ke kinoea B = z

Makemake ʻia: ʻO ka lakio o ka nui o ka wai A i ka wai B (y: z)

Lōlā:

E hoʻololi iā x ma ka hoohalike 2 me x ma ka hoohalike 1:

2. Ua kau ʻia kahi mea i loko o ka wai P, aia kahi hapa 0.5 o ka mea i loko o ka wai. Ke kau ʻia ka mea i loko o ka wai Q, aia ka mea i loko o ka wai, e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. He aha ka lakio o ka nui o ka wai P i ka wai Q?

ʻIke ʻia:

Ka nui o ka mea = x

ʻĀpana o ka mea i loko o ka wai P = 1/2 = 0.5

ʻO ka nui o ka wai P = y

ʻĀpana o ka mea i loko o ka wai Q = 1

ʻO ka nui o ka wai Q = z

Makemake ʻia: ʻO ka lakio o ka nui o ka wai P i ka wai Q (y: z)

Lōlā:

E hoʻololi iā x ma ka hoohalike 2 me x ma ka hoohalike 1:

3. He wahie e lana ana i loko o ka ʻaila (ʻo ka nui o ka ʻaila he 800 kg/m3 ⁾ . Aia he 4/5 ʻāpana o ka wahie i loko o ka ʻaila . He aha ka nui o ka wahie?

ʻIke ʻia:

Ka nui o ka ʻaila (ρ) = 800 kg/m ^-3

ʻĀpana o ka lāʻau i loko o ka ʻaila = 4/5

Makemake ʻia: Ka nui o ka lāʻau

Lōlā:

ʻO ke kaumaha o ka lāʻau he 640 kg/ ^m3.

4. ʻO ke kaumaha o kahi poloka he 50 N. I loko o ka wai, ʻo ke kaumaha o ka poloka he 30 N. Inā ʻo ka nui o ka wai he 10 ³ kg/m ^-3 he aha ka nui o ka poloka.

ʻIke ʻia:

Kaumaha o ka poloka i ka lewa (w) = 50 N

Kaumaha o ka poloka i loko o ka wai (w _wai ) = 30 N

Ka nui o ka wai (ρ _wai ) = 103 ^kg /m3 ⁼ 1000 kg/ ^m3

Ka wikiwiki ma muli o ke koʻikoʻi (g) = 10 m/s ²

Ka nuipa o ka poloka (m) = w/g = 50/10 = 5 kg

Makemake ʻia: Ka nui o nā poloka (ρ _poloka )

Lōlā:

Ka ikaika hoʻoluʻu:

F _A = ​​​​w - w _wai = 50 - 30 = 20 N

Ka nui o ka poloka i loko o ka wai:

F _A = ​​​​ρ g V

20 = (1000)(10) V

20 = (10,000) V

V = 20/10,000

V = 0.002 ^m3

Ka nui o ka poloka:

ρ = m/V = 5 / 0.002 = 2500 kg/m ³

5. He poloka lāʻau i hoʻoluʻu ʻia i loko o ka wai. Aia 25% o kona ʻāpana ma luna o ka ʻili o ka wai a aia 75% i loko o ka wai. ʻO ka nui o ka wai he 1 g/cm3 ^a ʻo ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s2 ^. E hoʻoholo i ka nui o nā poloka.

A. 0.025 kg/ ^m3

B. 0.075 g/ ^cm3

C. 0.250 kg/ ^m3

D. 0.750 g/cm ³

ʻIke ʻia:

ʻĀpana o nā poloka ma luna o ka ʻili o ka wai = 25% = 25/100 = 0.25

ʻO ka ʻāpana o ka poloka i loko o ka wai = 75% = 75/100 = 0.75

ʻO ka nui o ka wai (ρ _wai ) = 1 g/cm3 ⁼ 1000 kg/ ^m3

Ka wikiwiki ma muli o ke koʻikoʻi = 10 m/s ²

Makemake ʻia: Ka nui o nā poloka (ρ _poloka )

Lōlā:

Ka nui o nā poloka i loko o ka wai = ka lakio o ka nui o nā poloka i ka nui o ka wai

ʻO D ka pane pololei.

1. He aha ka density, a pehea e wehewehe ʻia ai ma ka makemakika?
   • pane mai: ʻO ke kaumaha ke ana o ka nui o ka nuipa i loko o kahi leo i hāʻawi ʻia. Ma ke ʻano makemakika, ua wehewehe ʻia ʻo ia ka nui =nuipa/nui​.
2. Pehea e hoʻoholo ai ka nui o kahi mea inā e lana a piholo paha ia i loko o ke wai?
   • pane mai: Inā emi ka nui o ka mea ma mua o ka nui o ke wai i waiho ʻia ai, e lana ka mea. I ka ʻaoʻao ʻē aʻe, inā ʻoi aku ka nui o ka mea ma mua o ka nui o ka wai, e piholo ia.
3. He aha ke kumumanaʻo ma hope o ka lana ʻana a i ʻole ka piholo ʻana o kahi mea i loko o kahi wai?
   • pane mai: ʻO ke kumumanaʻo ʻo ke Kumumanaʻo ʻo Archimedes, ʻo ia ka mea e ʻōlelo nei ua hoʻokomo ʻia ke kino i loko o kahi ʻike wai o kahi ikaika lana i luna e like me ke kaumaha o ka wai āna e hoʻoneʻe ai.
4. Inā lana kahi pahu hau i loko o ka wai me kahi hapa o ia mea ma luna o ka ʻilikai wai, he aha ka mea e hōʻike ai kēia e pili ana i ka nui o ka hau a me ka wai?
   • pane mai: Hōʻike kēia ua emi ka nui o ka hau ma mua o ka nui o ka wai. ʻO ia ke kumu e lana ai ka pahu hau, a he hapa wale nō o ia mea i koe i loko o ka wai e hoʻoneʻe i kahi nui o ka wai e like ke kaumaha me ka pahu hau.
5. No ke aha e lana ai nā moku kila kaumaha ma luna o ka wai ʻoiai e piholo paha ke kui kila liʻiliʻi?
   • pane mai: ʻOi aku ka liʻiliʻi o ka nui o ka moku kila, me kona mau ʻāpana hakahaka i piha i ka ea, ma mua o ka nui o ka wai. I ka hoʻohālikelike ʻana, ʻoi aku ka nui o ka nui o ke kui kila paʻa ma mua o ka nui o ka wai, e hoʻopio ana iā ia.
6. Pehea ka ʻokoʻa o ka manaʻo o ka "neutral buoyancy" mai ka lana ʻana a i ʻole ka piholo ʻana?
   • pane mai: Hana ʻia ka lana kūlike ʻole ke kaulike pololei ʻia ke kaumaha o kahi mea e ka ikaika lana, e hoʻomaha ana ka mea i loko o ke wai me ka ʻole o ka piʻi ʻana a piholo ʻana paha.
7. No ke aha e lana ai ka baluna helium i ka lewa?
   • pane mai: ʻOi aku ka liʻiliʻi o ka nui o ka helium ma mua o ka nui o ka ea. ʻO ka hopena, ʻoi aku ka liʻiliʻi o ke kaumaha o ka baluna helium (me ka mea baluna a me ka helium i loko) ma mua o ke kaumaha o ka ea āna e hoʻoneʻe ai, e lana ana.
8. He aha ka mea e hana ʻia i ka nui o kahi mea ke hoʻopili ʻia i loko o kahi leo liʻiliʻi ʻoiai e mau ana kona nuipa?
   • pane mai: E piʻi aʻe ka nui o ka paʻapū no ka mea, ua wehewehe ʻia ka nui o ka paʻapū ma ke ʻano he nuipaʻa i puʻunaue ʻia e ka nui. Inā emi ka nuipaʻa a mau ka nuipaʻa, e piʻi aʻe ka lakio (nuipaʻa).
9. Pehea ka hopena o ka paʻakai i ka nui o ka wai?
   • pane mai: ʻO ka hoʻonui ʻana i ka paʻakai o ka wai (ʻo ia hoʻi, ka hoʻohui ʻana i ka paʻakai) e hoʻonui i kona nui. ʻO ia ke kumu e lana maʻalahi ai nā mea i loko o ka wai paʻakai (e like me ke Kai Make) i hoʻohālikelike ʻia me ka wai maʻemaʻe.
10. Inā e lana ana kahi mea ma ke kaulike i loko o ke wai, pehea ka hoʻohālikelike ʻana o ka ikaika lana a me ka ikaika umekaumaha ma luna o ka mea?

• pane mai: Ke lana nei kahi mea ma ke kaulike, ua like ka nui o ka ikaika lana (ka ikaika i luna ma muli o ke wai) a ua kū'ē i ke kuhikuhi i ka ikaika umekaumaha (kaumaha) e hana ana ma luna o ka mea.