Gurumuda Networks
Kev hloov pauv cua sov - teeb meem thiab kev daws teeb meem
1. Ob lub hlau muaj tib qhov loj tab sis txawv hom. Lub thermal conductivity ntawm P = 2 npaug ntawm thermal conductivity ntawm Q. Qhov kub ntawm ob lub hlau yog dab tsi, raws li qhia hauv daim duab hauv qab no.
Paub:
k Q = k
kP = 2k
Xav tau: Kub ntawm ob lub hlau
Kev txav mus los - teeb meem thiab kev daws teeb meem
Torque
1. Ib lub beam ntev 140 cm. Muaj peb lub zog ua rau lub beam, F 1 = 20 N, F 2 = 10 N, thiab F 3 = 40 N nrog kev taw qhia thiab qhov chaw raws li pom hauv daim duab hauv qab no. Lub zog torque ua rau lub beam tig ib ncig ntawm qhov chaw nruab nrab ntawm lub beam yog dab tsi ?
Paub:
Lub hauv paus ntawm lub zog yog nyob rau hauv lub center ntawm lub beam.
Cov teb hluav taws xob - cov teeb meem thiab kev daws teeb meem
1. Lub ntsiab lus A nyob hauv nruab nrab ntawm ob lub zog hluav taws xob. Ob lub zog hluav taws xob muaj tib lub loj tab sis lub cim sib txawv thiab sib cais los ntawm qhov deb ntawm a. Lub zog hluav taws xob ntawm lub ntsiab lus A yog 36 N/C. Yog tias lub ntsiab lus A txav mus ze rau ib qho ntawm ob lub zog hluav taws xob , lub zog hluav taws xob ntawm lub ntsiab lus A yog dab tsi?
Paub:
Them 1 (q 1 ) = +Q
Them 2 (q 2 ) = -Q
Qhov nrug ntawm tus nqi 1 thiab qhov taw tes A (r 1A ) = ½ a
Lub zog fais fab - cov teeb meem thiab cov kev daws teeb meem
1. Peb lub nqi raws li qhia hauv daim duab hauv qab no . Lub zog hluav taws xob uas lub nqi B raug yog dab tsi . k = 9 x 10 9 Nm 2 C −2 , 1 μC = 10 −6 C.
Paub:
qA = 10 µC = 10 x 10-6 C = 10-5 Coulomb
q B = 10 µC = 10 x 10 -6 = 10 -5 Coulombs
q C = 20 µC = 20 x 10 -6 = 2 x 10 -5 Coulombs
Hluav taws xob static - teeb meem thiab kev daws teeb meem
Lub zog hluav taws xob
1. Taw tes A hauv ib lub teb hluav taws xob . Qhov loj ntawm lub teb hluav taws xob ntawm qhov taw tes A = 0.5 NC -1 . Yog tias muaj 0.25-C them rau ntawm qhov taw tes A, ces lub zog hluav taws xob uas siv rau ntawm qhov them yog dab tsi.
Paub:
Lub zog hluav taws xob ntawm qhov chaw A = 0.5 NC -1
Lub zog hluav taws xob ntawm qhov chaw A = 0.25 C
Xav tau: lub zog fais fab
Txoj Cai ntawm Newton ntawm Kev Txav Mus Los - Teeb Meem thiab Kev Dais Teeb Meem Txoj Cai ntawm Newton thawj zaug ntawm Kev Txav Mus Los 1. Yog tias tsis muaj lub zog ua haujlwm rau ib yam khoom, ces: (1) yam khoom tsis raug nrawm (2) yam khoom nyob twj ywm (3) qhov kev hloov pauv ntawm qhov ceev ntawm ib yam khoom = 0 (4) yam khoom tsis tuaj yeem mus ncig ntawm qhov ceev tas li Uas ... Nyeem ntxiv
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Lub zog centripetal - teeb meem thiab kev daws teeb meem 1. Ib lub pob 200-gram, txuas rau qhov kawg ntawm txoj hlua, tig mus rau hauv ib lub voj voog kab rov tav nrog qhov ceev ntawm 5 rad s-1. Yog tias txoj hlua ntev yog 60 cm, lub zog centripetal yog dab tsi? Paub: Yam khoom qhov hnyav (m) = 200 gr = 200/1000 kg = 2/10 ... Nyeem ntxiv
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