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

Kev poob qis dawb - teeb meem thiab kev daws teeb meem

1. Ib lub pob zeb poob dawb paug los ntawm qhov siab ntawm 45 meters. Yog tias acceleration vim lub ntiajteb txawj nqus yog 10 ms^-2, lub pob zeb thaum nws ntaus hauv av ceev npaum li cas?

Paub:

Qhov siab (h) = 45 meters

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

Xav tau: Qhov ceev kawg ntawm lub pob zeb thaum nws ntaus hauv av (v_t)

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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:

k_Q = k

k_P = 2k

SE pob: Kub ntawm ob lub hlau

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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.

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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 (r_1A) = ½ ib

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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:

q_A = 10 µC = 10 x 10^-6 C = 10^-5 Coulomb

q_B = 10 µC = 10 x 10^-6 = 10^-5 Coulomb

q_C = 20 µC = 20 x 10^-6 Luas = 2 x 10^-5 Coulomb

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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

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