physics

4 Kev ua haujlwm hauv Net Lub zog muaj peev xwm ntawm lub ntiajteb txawj nqus Lub zog Kinetic - Teeb Meem thiab Kev daws teeb meem

1. Ib yam khoom hnyav 5-kg nyob rau qhov siab 10-meters saum av. Kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s ^2. Yuav ua li cas thiaj ua tau rau yam khoom ntawd txav nws mus rau saum ntuj mus rau qhov siab 15-meters saum av?

Paub:

Qhov hnyav ntawm yam khoom (m) = 5 kg

Qhov siab (h) = 10 meters

Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s ²

Xav Tau: Tau ua haujlwm rau yam khoom ntawd kom txav nws mus rau saum toj mus rau qhov siab ntawm 15-meters saum av.

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Lub zog ntawm lub zog - cov teeb meem thiab cov kev daws teeb meem

1. Yog tias F _R yog lub zog ntawm F ₁ , F ₂ , thiab F ₃ , qhov loj ntawm lub zog F ₂ thiab x yog dab tsi?

Paub:

Lub zog ntawm lub cev (F)_R) = 40 N

Lub zog 1 (F ₁ ) = 10 N

Lub zog (F3 ₎ = 20 N

Xav tau: Qhov loj ntawm lub zog F ₂ thiab qhov deb ntawm x

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14 Txoj Cai Boyle Txoj Cai Charles Txoj Cai Gay-Lussac - Teeb Meem thiab Kev Dais Teeb Meem

1. Lub zog cua ntawm lub log tsheb yog 432 kPa nrog qhov kub ntawm 1 5 ^o C. Tom qab ob peb teev, lub zog cua yog 492 kPa. Yog tias tsis quav ntsej txog kev nthuav dav , qhov kub ntawm huab cua hauv lub log yog dab tsi?

Paub:

Lub siab pib (P1 ₎ = 432 kPa

Qhov siab kawg (P2 ₎ = 492 kPa

Kub pib (T1 ₎ = 15 ^o C

Xav tau: Qhov kub kawg (T ₂ )

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Lub voj voog Carnot - teeb meem thiab kev daws teeb meem

1. Yog tias cua sov uas lub cav nqus tau (Q _{1 ) = 10,000 Joules, lub} cav Carnot ua haujlwm li cas?

Paub:

Kub qis (T2 ₎ = 400 K

Kub siab (T1 ₎ = 800 K

Cov cua sov nkag (Q ₁ ) = 10,000 Joules

Xav tau: Ua haujlwm los ntawm Carnot engine (W)

tshuaj:

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Lub raj mis manometer - teeb meem thiab kev daws teeb meem

1. Ib lub raj manometer puv nrog ob hom kua. Qhov ceev ntawm kua 1 yog ρ ₁ = 0.8 g.cm ^-3 , thiab qhov ceev ntawm kua 2 yog ρ ₂ = 1 g.cm ^-3 , thiab qhov siab h ₁ = 10 cm, ces qhov siab ntawm h ₂ yog dab tsi.

Paub:

Qhov ceev ntawm cov kua 1 = 0.8 g.cm ^-3

Qhov ceev ntawm cov kua 2 = 1 g.cm ^-3

Qhov siab 1 = 10 cm

Xav Tau: Qhov Siab 2

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Lub zog tshuab - teeb meem thiab kev daws teeb meem

Lub hauv paus ntsiab lus ntawm lub zog ua haujlwm-mechanical

1. Tus coefficient ntawm kev sib txhuam kinetic ntawm lub thaiv thiab hauv pem teb (μ _k ) yog 0.5. Qhov kev hloov chaw ntawm ib yam khoom yog dab tsi? Kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s ².

Paub:

Tus coefficient ntawm kinetic friction (μk ₎ = 0.5

Qhov hnyav ntawm lub thaiv (m) = 4 kg

Kev nrawm vim lub ntiajteb txawj nqus (g) yog 10 m/s ²

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Kub thiab cua sov - teeb meem thiab kev daws teeb meem

1. Ntawm lub ntsuas kub X, qhov chaw khov ntawm dej ntawm -30 ^o thiab qhov chaw npau ntawm dej ntawm 90 ^o . 60 ^o X = ….. ^o C.

Paub:

Lub khov ntawm dej = -30 ^o

Lub ntsiab lus kub ntawm dej = 90 ^o

Xav tau: 60 ^o X = ….. ^o C

Tshuaj:

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Cov tsom iav saib hnub qub - teeb meem thiab kev daws teeb meem

1.

Raws li daim duab saum toj no, txiav txim siab qhov kev loj hlob ntawm lub tsom iav thaum lub qhov muag saib so.

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Thermodynamics - teeb meem thiab kev daws teeb meem

Thawj txoj cai ntawm thermodynamics

1. Raws li daim duab PV hauv qab no, qhov sib piv ntawm cov haujlwm uas cov roj ua hauv cov txheej txheem I, rau cov haujlwm uas cov roj ua hauv cov txheej txheem II yog dab tsi?

Paub:

Txheej Txheem 1:

Siab (P) = 20 N/ ^m2

Qhov ntim pib (V ₁ ) = 10 liv = 10 dm ³ = 10 x 10 ^-3 m ³

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Kev sib tsoo - teeb meem thiab kev daws teeb meem

1. Khoom A (3 kg) txav mus nrog qhov ceev ntawm 8 m/s thiab khoom B (5 kg) txav mus nrog qhov ceev ntawm 4 m/s. Yog tias qhov kev sib tsoo ntawm cov khoom A thiab B yog qhov ywj pheej zoo kawg nkaus, qhov ceev ntawm cov khoom A thiab B tom qab kev sib tsoo yog dab tsi?

Paub:

Qhov hnyav ntawm yam khoom A (m1 ₎ = 3 kg

Qhov hnyav ntawm yam khoom B (m2 ₎ = 5 kg

Qhov ceev ntawm yam khoom A (v ₁ ) = 8 ms ^–1

Qhov ceev ntawm yam khoom B (v ₂ ) = 4 ms ^–1

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