Gurumuda Networks
Kev hloov pauv cua sov - teeb meem thiab kev daws teeb meem
1. Ob lub hlau muaj tib qhov loj tab sis sib txawv hom. Lub thermal conductivity ntawm P = 2 npaug ntawm thermal conductivity ntawm Q. Dab tsi yog? kub nruab nrab ntawm ob lub hlau, raws li pom hauv daim duab hauv qab no.
Paub:
kQ = k
kP = 2k
SE pob: 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 ntawm lub beam, F1 = 20 N, F2 = 10 N, thiab F3 = 40 N nrog kev taw qhia thiab qhov chaw raws li qhia hauv daim duab hauv qab no. Dab tsi yog qhov lub zog ua rau lub teeb tig ib ncig ntawm qhov chaw nruab nrab ntawm lub teeb?
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. Qhov chaw A nyob hauv nruab nrab ntawm ob lub zog hluav taws xob. Ob lub zog hluav taws xob muaj tib qhov loj tab sis lub cim sib txawv thiab sib cais los ntawm qhov deb ntawm a. Qhov loj ntawm lub zog hluav taws xob ntawm qhov chaw A yog 36 N/C. Yog tias qhov chaw A txav mus ze rau ib qho ntawm ob qho tib si. nqi, qhov loj ntawm qhov fais fab teb ntawm qhov chaw A?
Paub:
them 1 (q1) = +Q
them 2 (q2) = -Q
Qhov nrug ntawm tus nqi 1 thiab qhov taw tes A (r1A) = ½ ib
Lub zog fais fab - cov teeb meem thiab cov kev daws teeb meem
1. peb nqi raws li pom hauv daim duab hauv qab no. Dab tsi yog qhov lub zog hluav taws xob tau ntsib los ntawm tus neeg them nqi B. k = 9 x 109 Nm2C-2, 1 μC = 10-6 C.
Paub:
qA = 10 µC = 10 x 10-6 C = 10-5 Coulomb
qB = 10 µC = 10 x 10-6 = 10-5 Coulomb
qC = 20 µC = 20 x 10-6 Luas = 2 x 10-5 Coulomb
Hluav taws xob static - teeb meem thiab kev daws teeb meem
Lub zog hluav taws xob
1. Taw tes A hauv ib qho fais fab tebQhov loj ntawm lub teb hluav taws xob ntawm qhov chaw A = 0.5 NC-1Yog tias muaj 0.25-C them rau ntawm qhov chaw A, ces qhov ntawd yog dab tsi? lub zog hluav taws xob ua rau ntawm qhov kev them.
Paub:
Lub zog hluav taws xob ntawm qhov chaw A = 0.5 NC-1
Raug nqi ntawm qhov chaw A = 0.25 C
SE pob: Lub zog hluav taws xob
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
Kev txav mus los ncaj - teeb meem thiab kev daws teeb meem 1. Daim duab qhia txog qhov ceev (v) piv rau lub sijhawm (t) qhia hauv daim duab hauv qab no. Qhov kev qeeb yog dab tsi raws li daim duab. Kev daws teeb meem AB = kev txav mus los ntawm kev nrawm tas li, BC = kev txav mus los ntawm qhov ceev tas li, CD = kev txav mus los ntawm kev qeeb tas li. 2. Daim duab qhia txog kev txav mus los ncaj qhia hauv daim duab ... nyeem ntxiv
Txoj Cai Hooke thiab elasticity - teeb meem thiab kev daws teeb meem Qhov kev hloov pauv ntawm qhov ntev 1. Ib tug pas nrig muaj qhov ntev ntawm L, rub los ntawm lub zog ntawm F. Qhov ntau ntawm kev ntev yog ∆L. Qhov loj ntawm lub zog yog dab tsi yog tias qhov kev hloov pauv ntawm qhov ntev yog 4∆L. Paub: Lub zog 1 (F1) = F Qhov kev hloov pauv ... nyeem ntxiv
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
Lub zog nqus - teeb meem thiab kev daws teeb meem 1. Qhov sib piv ntawm lub zog nqus ntawm lub zog nqus ntawm yam khoom A thiab yam khoom B yog dab tsi? Paub: Qhov hnyav ntawm yam khoom A (mA) = 1 Qhov hnyav ntawm yam khoom B (mB) = 2 Qhov nrug ntawm yam khoom A ntawm lub ntiaj teb (rA) = 1 Qhov nrug ntawm yam khoom ... nyeem ntxiv