Cov Teeb Meem Tau Daws Hauv Kev Kawm Txog Physics Yooj Yim

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 twg yog? tshaj tawm ntawm cov khoom A thiab B tom qab kev sib tsoo?

Paub:

Pawg ntawm yam khoom A (m₁) = 3 kg

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

cov ceev ntawm yam khoom A (v₁) = 8 ms^-1

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

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Cov vectors hauv chav tsev - teeb meem thiab kev daws teeb meem

1. Ib yam khoom txav mus rau ntawm ib qho tshaj tawm ntawm v = (2i − 1.5j) m/s. Dab tsi yog qhov xaav ntawm qhov khoom tom qab 4 vib nas this?

Paub:

Qhov feem kab rov tav ntawm qhov ceev (v)_x) = 2 m/s

Qhov feem ntsug ntawm qhov ceev (v)_y) = 1.5 m/s

Lub sijhawm luv (t) = 4 vib nas this

Xav tau: xaav

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Kev hloov chaw ntawm vector - teeb meem thiab kev daws teeb meem

1. Ib tug neeg taug kev ntawm qhov chaw A mus rau qhov chaw B, 600 meters sab qaum teb; ces mus rau qhov chaw C, 400 meters sab hnub poob; ces mus rau qhov chaw D, 200 meters sab qab teb; thiab ces mus txog qhov chaw E, 700 meters sab hnub tuaj. Qhov loj ntawm qhov no yog dab tsi? xaav?

Tshuaj:

Paub:

AB = AB – BF = AB – CD = 600 – 200 = 400 m

EF = DE – DF = DE – BC = 700 – 400 = 300 m

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Ntxiv cov vectors siv cov khoom sib xyaw - teeb meem thiab kev daws teeb meem

1. Peb lub vectors raws li qhia hauv daim duab hauv qab no.

V₁ = 30

V₂ = 30

V₃ = 40

Qhov tshwm sim yog dab tsi cov duab.

Paub:

V₁ = 30, lub kaum sab xis ntawm V₁ thiab x axis = 30^o

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Cov duab ntawm kev txav mus los linear - teeb meem thiab kev daws teeb meem

1. Kos duab qhov deb (ntsug) piv rau lub sijhawm (kab rov tav) raws li pom hauv daim duab hauv qab no. Ib yam khoom uas so tau qhia los ntawm tus lej…

Tshuaj:

Tus lej 3, qhia los ntawm ib txoj kab ncaj.

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Qhov nruab nrab ntawm qhov ceev - teeb meem thiab kev daws teeb meem

1. Muaj ib tug neeg ua ib lub duab plaub fab uas ntev li 400 m thiab dav li 100 m, puag ncig 12 zaug hauv 1 teev. Cov no yog dab tsi? qhov nruab nrab ntawm qhov ceev thiab cov nruab nrab ceev?

Paub:

Qhov ntev ntawm lub duab plaub fab = 400 meters

Dav ntawm lub duab plaub fab = 100 meters

Lub voj voog ntawm lub duab plaub fab = (2 x 400 meters) + (2 x 100 meters) = 800 meters + 200 meters = 1000 meters

Qhov Nrug = 12 x 1000 meters = 12,000 meters = 12 kilometers

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Txoj Cai Dub - Teeb Meem thiab Kev daws teeb meem

1. 200-gram dej ntawm 30°C sib xyaw nrog 100-gram dej ntawm 90°C. Lub lub tshav kub tshwj xeeb dej = 1 cal.gram^-1° C^-1. Txheeb xyuas qhov kub kawg ntawm qhov sib tov!

Paub:

Pawg ntawm dej 2 (m₁) = 200 grams

Kub ntawm dej 1 (T₁= 30 TZS^oC

Qhov hnyav ntawm dej 2 (m₂) = 100 grams

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10 Dynamics Khoom txuas nrog los ntawm txoj hlua hla lub pulley Atwood tshuab - Teeb Meem thiab Kev daws teeb meem

1. Thaiv A nrog ib loj ntawm 5 kg, muab tso rau ntawm ib lub dav hlau kab rov tav. Block B nrog qhov hnyav ntawm 3 kg dai ntawm ib kawg ntawm txoj hlua txuas nrog block A hla lub pulley. Acceleration vim lub ntiajteb txawj nqus yog 10 m/s². Dab tsi yog qhov acceleration ntawm ob lub blocks?

Paub:

Qhov hnyav ntawm thaiv A (m_A) = 5 kg

Qhov hnyav ntawm thaiv B (m_B) = 3 kg

Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²

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Kev txav mus los ncig - teeb meem thiab kev daws teeb meem

1. Ib yam khoom hnyav 10-kg txav mus los hauv ib lub voj voog nrog qhov ceev tas li 4 m/s. Yog tias lub vojvoog ntawm lub voj voog yog 0.5 meters, ces:

1) Lub zaus ntawm cov voj voog yog 4/π Hz

2) Lub kev nrawm ntawm centripetal yog 32 ms^-2

3) Lub lub zog centripetal yog 320 N

4) Lub sijhawm yog 4π s.

Cov lus hais twg yog cov lus tseeb?

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