Amandla amakhulu - izinkinga nezixazululo

Amandla amakhulu - izinkinga nezixazululo

1. Ibhulokhi yokhuni enobude = 2.5 m, ububanzi = 0.5 m kanye nokuphakama = 0.4 m. Ubuningi bamanzi buyi-1000 kg/m ^3. Uma ibhulokhi ifakwa emanzini, ayini amandla okuphaphazela ... Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 N/kg.

Kwaziwa:

Umthamo webhulokhi (V) = ubude x ububanzi x ukuphakama = 2.5 x 0.5 x 0.4 = 0.5 m ³

Ubuningi bamanzi (ρ) = 1000 kg/ ^m3

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 N/kg

Okufunwayo: Ubukhulu bamandla anamandla

Isixazululo:

Ifomula yamandla athambile:

F = ρ g V

F = amandla okuphaphazela , ρ = ukuminyana kwamanzi , g = ukusheshisa ngenxa yamandla adonsela phansi , V = ivolumu

F = (1000)(10)(0.5) = (1000)(5) = 5000 amaNewton

2. Isisindo sento esemoyeni singama-N ayi-100. Into ifakwa oketshezini. Ukwanda kwevolumu yoketshezi kungu-1.5 m ^3. Uma isisindo esithile soketshezi singama-N ayi-10/m ³ , siyini isisindo sento eseketshezini.

Kwaziwa:

Isisindo sento emoyeni (w) = amaNewton ayi-100

Ukwanda kwevolumu yoketshezi = ivolumu yento eketshezini (V) = 1.5 m ³

Isisindo esithile soketshezi = 10 N/m ³

Okufunwayo: Isisindo sento ngoketshezi

Isixazululo:

Isisindo sento kuketshezi = isisindo sento emoyeni – amandla athambile

Isisindo sento ngoketshezi = 100 Newton – amandla okuphapha

Ifomula yamandla athambile:

F _A = ​​​​ρ g V

F _A = ​​​​amandla avuselelayo = amandla asetshenziswa uketshezi entweni esemanzini

ρ = ukuminyana koketshezi

g = ukusheshisa ngenxa yamandla adonsela phansi

V = ivolumu yento kuketshezi

Isisindo esithile:

Isisindo esithile soketshezi = 10 N/m ³

w / V = ​​​​10 N/m ³

mg / V = ​​​​10 N/m ³

m (10) / V = ​​​​10 N/m ³

m / V = ​​​​1 kg/m ³

ρ = 1 kg/m ³

Ubuningi boketshezi buyi-1 kg/ ^m3

Ubukhulu bamandla athambile :

F _A = ​​​​ρ g V = (1 kg/m ³ )(10 m/s ² )(1.5 m ³ ) = 15 kg m/s ² = 15 AmaNewton

Isisindo sento ngoketshezi:

Isisindo sento ngoketshezi = 100 Newtons – 15 Newtons

Isisindo sento ngoketshezi = 85 Newtons

3. Umkhumbi ohamba olwandle ungena emfuleni obanzi nojulile. Ubuningi bamanzi olwandle bungu-1100 kg/m3 ^, ubuningi bamanzi omfula bungu - 1000 kg/ m3 . Thola ukuqhathanisa umthamo wento esemanzini olwandle nasemanzini ^omfula.

A. 11: 10

B. 10: 11

C. 121: 100

D. 1: 1

Kwaziwa:

Ubuningi bamanzi olwandle (ρ ₁ ) = 1100 kg/ ^m3

Ubuningi bamanzi omfula (ρ ₂ ) = 1000 kg/ ^m3

Okufunwayo: Ukuqhathaniswa komthamo wento esemanzini olwandle nasemanzini omfula . Ukuqhathaniswa komthamo wento esemanzini olwandle nasemanzini omfula.

Isixazululo:

Uma into intanta khona-ke amandla okuphapha (F _B ) = isisindo (w):

Isimiso sika- Archimedes sithi amandla ashukumisayo asebenza entweni ewuketshezi (amanzi) alingana nesisindo soketshezi (amanzi) olususayo. Umthamo wento ewuketshezi (amanzi) ulingana nomthamo woketshezi (amanzi) olunyakaziswayo.

Ukuqhathaniswa komthamo wento emanzini olwandle kanye nase- amanzi omfula:

Impendulo efanele ngu-B.

4. Igolide, elinobunzima obungamagremu angu-193 lise-kerosene enamandla aphezulu angama-dynes angu-8000. Uma ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ² kanti ubuningi be -kerosene bungu-0.8 gr/cm ³ , khona-ke nquma ubuningi begolide.

A. 1.93 gr/ ^cm3

B. 8.65 gr/ ^cm3

C. 19.3 gr/ ^cm3

D. 193 gr/ ^cm3

Kwaziwa:

Isisindo segolide (m _igolide ) = 193 amagremu = 0.193 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Amandla okuqina (F _A ) = 8000 dyne = 8 x 10 ³ dyne = (8 x 10 ³ )(10 ^-5 N) = 8 x 10 ^-2 N = 0.08 Newton

Ubuningi be-parafini (ρ) = 0.8 gr/cm ³ = 800 kg/m ³

Okufunwayo: Ubuningi begolide

Isixazululo:

Isisindo segolide emoyeni:

w = mg = ρ _b V g —– Isibalo 1

U-V umqulu wegolide ku-parafini.

Amandla amakhulu (F _B ) alingana nesisindo segolide emoyeni (w) ngaphandle kwesisindo segolide ku-kerosene (w'):

w – w' = F _A

w – w' = ρ _f V g —– Isibalo 2

U-V umqulu wegolide ku-parafini.

Zombili izilinganiso ezingenhla zingabhalwa futhi ngezansi:

Impendulo efanele ithi C.

1. Iyini isimiso esiyisisekelo samandla anamandla?
   • Impendulo: Isimiso esiyisisekelo samandla okuphapha yiSimiso sika-Archimedes. Sithi into ecwiliswe oketshezini ithola amandla aphezulu abizwa ngokuthi amandla okuphapha alingana ngobukhulu nesisindo soketshezi olususwe yinto.
2. Kungani into izwakala ilula uma icwiliswe emanzini?
   • Impendulo: Uma into icwiliswe emanzini, isusa umthamo othile wamanzi. Isisindo sala manzi asusiwe sisebenzisa amandla akhuphukayo entweni, alwa nesisindo sento, okwenza izwakale ilula.
3. Uma into intanta emanzini, isisindo sayo siqhathaniswa kanjani namandla asebenza kuyo?
   • Impendulo: Uma into intanta, amandla okuphapha asebenza kuyo alingana nesisindo sento. Yingakho into ihlala isesimweni esilinganayo ngaphandle kokucwila noma ukukhuphuka.
4. Ingabe amandla okuphapha ayasebenza ezintweni ezisemoyeni?
   • Impendulo: Yebo, amandla okuphapha asebenza ezintweni ezikunoma yiluphi uketshezi, okuhlanganisa nomoya. Kodwa-ke, ngenxa yokuthi umoya awuqinile kakhulu kuneziketshezi ezifana namanzi, amandla okuphapha emoyeni mancane kakhulu futhi ngokuvamile awabalulekile ezintweni zansuku zonke.
5. Kungani ezinye izinto zicwila emanzini kanti ezinye zintanta emanzini?
   • Impendulo: Ukuthi into iyacwila noma iyantanta kuncike ebuhlotsheni obuphakathi kwesisindo sayo namandla okuntanta. Uma amandla okuntanta (ngenxa yoketshezi olususiwe) makhulu kunesisindo sento, iyantanta. Uma isisindo sikhulu, iyacwila.
6. Uma ubungathatha ibhola lensimbi elingenalutho kanye nebhola lensimbi eliqinile elinobukhulu obufanayo kanye nezinto ezifanayo, bese ulicwilisa emanzini, yiliphi elingaba namandla amakhulu okuphapha?
   • Impendulo: Amandla okuphapha ancike kumthamo woketshezi oluphumile hhayi kubunzima bento. Njengoba womabili amabhola esusa umthamo ofanayo wamanzi, azozwa amandla afanayo okuphapha.
7. Kungani imikhumbi eyenziwe ngensimbi, eqine kakhulu kunamanzi, intanta?
   • Impendulo: Imikhumbi yaklanywa ngezikhala ezinkulu ezingenalutho ngaphakathi, okusho ukuthi isilinganiso sayo esijwayelekile singaphansi kwesamanzi. Amanzi asuswa umkhumbi anamandla okuphapha angasekela isisindo somkhumbi, awenze untante.
8. Uma ucindezela ibhola elintantayo emanzini bese ulidedela, kuzokwenzekani?
   • Impendulo: Uma ucindezela ibhola elintantayo lijule emanzini, ukhulisa umthamo wamanzi eliwususayo, okwandisa amandla okugobhoza. Uma ulikhulula, amandla okugobhoza akhuphukile azolisunduzela phezulu lize libuyele esimweni salo sokulingana.
9. Kwenzekani emandleni athambile entweni ecwiliswe emanzini uma uyisusa emanzini ahlanzekile uyiyise emanzini anosawoti?
   • Impendulo: Amanzi anosawoti aminyene kunamanzi ahlanzekile. Ngakho-ke, ngomthamo ofanayo osusiwe, amandla okugeleza emanzini anosawoti azoba makhulu kunamanzi ahlanzekile. Ngakho-ke, into ingase intante kakhulu emanzini anosawoti kunamanzi ahlanzekile.
10. Kungenzeka yini ukuthi into iqine kwenye indawo (isb., iqonde phezulu) kodwa ingazinzile kwenye (isb., iqonde phezulu) ngenkathi intanta emanzini?

• Impendulo: Yebo, ukuzinza kwento entantayo kuncike ekusatshalalisweni kwesisindo sayo uma kuqhathaniswa namandla athambile. Uma isikhungo samandla adonsela phansi singaphezu ngqo kwesikhungo sokuthambile, into izozinza. Kodwa-ke, uma ushintsha indlela eqondiswa ngayo, ubudlelwano phakathi kwezikhungo bungashintsha, okuholela ekungazinzini kuleyo ndlela ethile.