Saense

3 Mehlala ea phetiso ea mocheso ka convection

1. Hlalosa ka ho sebelisa mehlala, moelelo phetiso ea mocheso ka convection ?
Puisano
Phetisetso ea mocheso oa convection ke phetisetso ea mocheso e tsamaeang le motsamao oa lintho. Mohlala, nahana ka metsi a ka setshelong sa aluminium a futhumatsoang ka setofong. Qalong, mocheso o fetisetsoa ka phetisetso le mahlaseli ho tloha lelakabeng ho ea setshelong sa aluminium, ebe o fetisetsoa ka phetisetso ho tloha setshelong sa aluminium ho ea metsing.
Phetisetso ea mocheso oa convection e qala ha metsi a haufi le setshelo sa aluminium a fumana mocheso o eketsehileng, a eketsa mocheso oa ona ebe oa atoloha. Katoloso ena e fokotsa bongata ba ona, e leng se etsang hore metsi a phaphamale holim'a metsi. Metsi ana a nkeloa sebaka ke metsi ka mocheso o tlase le bongata bo phahameng. Ts'ebetso ena e tsoela pele, e leng se etsang hore motlakase o be teng ka har'a setshelo. Ts'ebetso e emisa hang ha metsi 'ohle a fihla holim'a metsi. suhu kapa ha metsi a bela.
Mohlala o mong ke moea. Moya ke moya o tsamayang. Moya o tsamaya e le hore mocheso o ka tloha dibakeng tse nang le mocheso o phahameng ho ya dibakeng tse nang le mocheso o tlase.

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Mehlala e 4 ea lipotso mabapi le mocheso o patehileng, mocheso oa ho kopana, mocheso oa mouoane

1. Palo ea mocheso o lokelang ho monngoa ho fetola boemo ba gram e le 'ngoe ea khauta ho tloha ho e tiileng ho ea ho e metsi ke….. Mocheso o qhibilihang oa khauta = 64,5 x 10 ³ J/kg

Puisano

Hoa tsebahala hore:

Boima ba khauta (m) = gram e le 1 = 1 x 10 ^-3 kg

Mocheso oa ho kopanngoa ha khauta (L _F ) = 64,5 x 10 ³ J/kg

Potso: Mocheso (Q) o monngoa ke khauta

Karabo:

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Mehlala e 9 ea lipotso tsa fisiks ea nyutlelie mabapi le likarabelo tsa ho kopanya le matla a ho tlama a athomo

1. Hlokomela karabelo e latelang ea ho kopanya ha nyutlelie:
₁H² + ₁H³ → ₂He⁴ + ₀n¹ +E
Haeba boima ₁H² = 2,014 amu, boima ₁H³ = 3,016 amu, boima ba karoloana ea α = 4,0026 amu le boima ba neutron = 1,0084 amu, joale matla a hlahisoang ke…. (amu e le 'ngoe e lekana le 931 MeV)
A. 18,62 MeV
B. 17,69 MeV
C. 16,76 MeV
D. 15,73 MeV
E. 14,89 MeV
Puisano

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Mehlala e 4 ea lipotso tse itseng tsa mocheso le bokhoni ba mocheso

1. Ke eng e futhumatsang kapele ha e omiswa hammoho letsatsing le chesang, aluminium kapa koporo? Mocheso o ikgethang wa aluminium = 900 J/kg ^o C mme mocheso o ikgethang wa koporo = 390 J/kg ^o C.

Puisano

Ha mocheso o itseng wa ntho o le moholo, ho nka nako e telele hore ntho e futhumale, ka lehlakoreng le leng, ha mocheso o itseng wa ntho o le monyane, o futhumala kapele.

Mocheso o itseng oa koporo o monyane ho feta mocheso o itseng oa aluminium, ka hona koporo e chesa kapele.

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Mehlala e 5 ea mathata a mocheso

1. Thine e boima ba lik'hilograma tse 2 e na le mocheso o itseng oa 130 J.kg ^-1 C ^-1 . Palo ea mocheso o monngoang ke thine ho phahamisa mocheso oa eona ho tloha ho 50 ^o C ho isa ho 100 ^o C ke….

Puisano

Hoa tsebahala hore:

Boima (m) = 2 kg

Mocheso o itseng oa thini (c) = 130 J.kg ^-1 C ^-1

Phetoho ea mocheso (Δ T) = 100 ^o C – 50 ^o C = 50 ^o C

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Mehlala e 5 ea lipotso tsa katoloso ea molumo

1. Bolo e tiileng e entsoe ka aluminium ka karolelano ea katoloso e otlolohileng ea 24 x 10 ^{-6 o} C ^-1 . Haeba mochesong oa 30 ^o C bophahamo ba bolo e le 30 cm ³ , joale e le hore bophahamo ba bolo bo eketsehe ho fihlela ho 30,5 cm ^3, bolo e tlameha ho futhumatsoa mochesong oa….. ^o C

Puisano

Hoa tsebahala hore:

Koefficient ea katoloso e otlolohileng (α ) = 24 x 10 ^{-6 o} C ^-1

Koefficient ea katoloso ea molumo (γ ) = 3 a = 3 x 24 x 10 ^{-6 o} C ^-1 = 72 x 10 ^{-6 o} C ^-1

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3 Mehlala ea lipotso mabapi le katoloso ea sebaka

1. Leqephe la tšepe mochesong oa 20 ^o C le bolelele ba 50 cm le bophara ba 30 cm. Haeba coefficient ea katoloso e otlolohileng ea tšepe e le 10 ^{-5 o} C ^-1 joale keketseho ea sebaka le sebaka sohle mochesong oa 60 ^o C ke….

Puisano

Hoa tsebahala hore:

Mocheso oa pele (T ₁ ) = 20 ^o C

Mocheso oa ho qetela (T ₂ ) = 60 ^o C

Phetoho ea mocheso (Δ T) = 60 ^o C – 20 ^o C = 40 ^o C

Sebaka sa qalong (A ₁ ) = Bolelele x bophara = 50 cm x 30 cm = 1500 cm ²

Koefficient ea katoloso e otlolohileng ea tšepe (α ) = 10 ^{-5 o} C ^-1

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Mehlala e 6 ea Lipotso tsa Mohlala oa Atomo

1. Phapang pakeng tsa mehlala ea athomo ho ea ka Rutherford le Bohr ke…..

Puisano

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Mehlala e 5 ea lipotso mabapi le katoloso ea bolelele

1. Setene sa tšepe mochesong oa likhato tse 20^oC e bolelele ba 40 cm. Coefficient ea katoloso e otlolohileng ea tšepe ke 10^{-5 o}C^-1Keketseho ea bolelele ba tšepe le bolelele ba ho qetela ba tšepe ho suhu 70^oC ke…..
Puisano
Hoa tsebahala hore:
Keketseho ea mocheso (ΔT) = 70^oC - 20^oEA-50-C^oC
Bolelele ba qalong (L)₁) = 40 cm
Koefficient ea katoloso e otlolohileng ea tšepe (a) = 10^{-5 o}C^-1
O botsitse: Keketseho ea bolelele (ΔL) le bolelele ba ho qetela (L)₂)
Karabo:
a) Keketseho ea bolelele (ΔL)
ΔL = α L₁ ΔT
ΔL = (10^{-5 o}C^-1)(40 cm)(50^oC)
ΔL = (10^-5)(2 x 10³) cm
ΔL = 2 x 10^-2 cm
ΔL = 2/10² cm
ΔL = 2 / 100 cm
ΔL = 0,02 cm

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Mehlala e 6 ea lipotso tsa phetoho ea sekala sa mocheso: Sekala sa Celsius, sekala sa Fahrenheit, sekala sa Kelvin

1. 50^oC = ….. ^oF?
Puisano
Khatellong ea moea ea sepakapaka se le seng, mocheso oa ntlha ea leqhoa bakeng sa thermometer ea Celsius ke 0^oC, athe thermometer Sekala sa Fahrenheit ke 32^oF. Khatellong ea moea ea sepakapaka se le seng, mocheso oa ntlha ea mouoane bakeng sa thermometer ea Celsius ke 100^oC, ha thermometer ea sekala sa Fahrenheit e le 212^oF.
Kahoo 0^oEA-32-C^oF le 100^oEA-212-C^oF.

^{Sekaleng sa Celsius, ho na le likhato} tse 100 pakeng tsa 0 ^° C le 100 ^° C. Sekaleng sa Fahrenheit, ho na le ^{likhato tse 180 pakeng tsa 32 °} F le 212 ^° F. Ho fumana mocheso oa Fahrenheit (T ^° F), qala ka ho atisa mocheso oa Celsius (T ^° C) ka 9/5 ebe u eketsa ^{likhato tse 32.}

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