Tsev Kawm Ntawv Qib Siab Physics

Tsis yog txhua yam khoom uas peb ntsib hauv lub neej txhua hnub yeej ib txwm so. Ib yam khoom yuav so thaum xub thawj, tab sis yog tias nws raug txav mus los, nws tuaj yeem txav mus los. Lo lus nug yog seb nws puas rov qab mus rau nws qhov chaw qub tom qab txav mus los. Qhov no nyob ntawm qhov kev txav mus los. hom kev sib npaug ntawm cov khoom tus.
Yog tias ib yam khoom uas so tsis txav muaj kev cuam tshuam (muaj lub zog tshwm sim los yog lub sijhawm ntawm lub zog ua rau yam khoom) ces yam khoom ntawd yuav txav mus. Tom qab txav mus, yuav muaj peb txoj hauv kev, uas yog: (1) yam khoom rov qab mus rau nws qhov chaw qub, (2) yam khoom txav tawm ntawm nws qhov chaw qub, (3) yam khoom tseem nyob hauv nws qhov chaw tshiab. Yog tias tom qab txav mus, yam khoom rov qab mus rau nws qhov chaw qub ces yam khoom ntawd nyob hauv ruaj khov sib npaugYog tias tom qab txav mus lawm, qhov khoom txav mus deb ntawm nws qhov chaw qub, ces qhov khoom ntawd nyob hauv tsis ruaj khovNtawm qhov tod tes, yog tias tom qab txav mus rau qhov khoom tseem nyob hauv nws qhov chaw tshiab, ces qhov khoom ntawd nyob hauv qhov sib npaug nruab nrab.

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2 Piv txwv ntawm cov lus nug txog kev sib npaug ntawm cov khoom me me

1. Muab ib yam khoom uas hnyav 10 kg dai rau ntawm ib txoj hlua. Xam seb txoj hlua ntawd muaj zog npaum li cas (T)! g = 10 m/s²
Kev Sib Tham

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5 Piv txwv ntawm lub zog kinetic thiab cov lus nug txog kev ua haujlwm physics

1. Lub tsheb uas hnyav 5000 kg thaum xub thawj nres, thiab tom qab ntawd txav mus rau qhov ceev ntawm 20 m/s. Txheeb xyuas tag nrho cov haujlwm ua tiav rau lub tsheb...
Kev Sib Tham
Nws yog paub :
Qhov hnyav (m) = 5000 kg
Qhov ceev pib (v_o) = 0 m/s (thawj zaug lub tsheb nres twj ywm)
Qhov ceev kawg (v_t) = 20 m/s
Nug Tag nrho cov kev siv zog

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15 Piv txwv ntawm Cov Lus Nug Txog Lub Ntsiab Cai ntawm Dub

1. Cov dej khov uas muaj qhov hnyav li 0,2 kg raug sib xyaw nrog cov tshuaj yej sov uas muaj qhov hnyav li 0,2 kg. Qhov kub ntawm cov dej khov = - 10 ^o C, qhov kub ntawm cov tshuaj yej sov = 40 ^o C. Qhov kub tshwj xeeb ntawm cov dej khov = 2100 J/kg C ^o , qhov kub tshwj xeeb ntawm dej = 4200 J/kg C ^o , qhov kub ntawm kev sib xyaw ntawm dej = 334.000 J/kg. Yog tias cov dej khov thiab cov tshuaj yej sov raug sib xyaw ua ke hauv ib lub kaw lus kaw, txiav txim siab qhov kub kawg ntawm qhov sib tov.

Kev Sib Tham
Nws yog paub :
Qhov hnyav ntawm dej khov (m es) = 0,2 kg
Qhov hnyav ntawm dej tshuaj yej sov (m tshuaj yej) = 0,2 kg
Cov cua sov tshwj xeeb ntawm dej (c dej) = 4180 J/kg C^o
Qhov kub tshwj xeeb ntawm dej khov (c es) = 2100 J/kg C^o
Kub ntawm kev sib xyaw ntawm dej (L)_f dej) = 334.000 J/kg

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5 piv txwv ntawm kev hloov pauv ntawm lub kaum sab xis thiab kev hloov pauv ntawm txoj kab ncaj nraim hauv kev txav mus los

1. Ib lub log uas muaj lub vojvoog ntawm 30 cm tig ib qho deb ntawm 10 radians. Ib qho ntawm ntug ntawm lub log mus deb npaum li cas?
Kev Sib Tham
Qhov deb ntawm ntug ntawm lub log thiab nruab nrab ntawm lub log = lub vojvoog ntawm lub log.
Nws paub tias:
Lub vojvoog (r) = 30 cm = 0,3 meters
Ces kaum (tus phauj) = 10 radians
Nug: qhov deb uas tau mus ncig (s)
Lus teb:

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2 Piv txwv ntawm cov lus nug txog kev txiav txim siab qhov vector tshwm sim siv cov vectors sib xyaw

1. F ₁ = 6 N, F ₂ = 10 N. Qhov tshwm sim ntawm ob lub zog vectors yog…

Kev Sib Tham
F_1x =F₁ coj 60^o = (6)(0,5) = 3 N (zoo vim nws nyob rau hauv qhov kev taw qhia x zoo)
F_2x =F₂ coj 30^o = (10)(0,5√3) = 5√3 = (5)(1,372) = -8,66 N (tsis zoo vim nws nyob rau hauv qhov kev taw qhia x tsis zoo)
F_1y =F₁ kev txhaum 60^o = (6)(0,5√3) = 3√3 = (3)(1,372) = 4,116 N (zoo vim nws nyob rau hauv qhov kev taw qhia y zoo)
F_2y =F₂ kev txhaum 30^o = (10)(0,5) = -5 N (tsis zoo vim nws nyob rau hauv qhov kev taw qhia y tsis zoo)

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2 Piv txwv ntawm cov lus nug txog kev txiav txim siab cov khoom vector

1. Lub zog vector F = 20 Newton tsim lub kaum sab xis ntawm 30 ^o rau qhov x-axis zoo. Txheeb xyuas cov khoom ntawm vector F ntawm x-axis (F _x ) thiab y-axis (F _y ).

Kev Sib Tham
F_x = F cos 30^o = (20)(cos 30^o) = (20)(0,5√3) = 10√3 Newtons

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Kawm cov piv txwv ntawm cov teeb meem ntawm kev cuam tshuam thiab kev diffraction ntawm lub teeb - ib qho slit , tom qab ntawd ua haujlwm rau cov teeb meem ntawm kev cuam tshuam thiab kev diffraction ntawm lub teeb.

1. Lub teeb uas muaj qhov ntev ntawm 700 nm hla dhau ib qho qhov uas muaj qhov dav ntawm 0,2 hli. Tus qauv diffraction ntawm lub vijtsam yog nyob ntawm qhov deb ntawm 50 cm ntawm qhov qhov. Txheeb xyuas qhov deb ntawm kab tsaus thib ob thiab kab teeb loj.
Kev Sib Tham

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Kawm cov piv txwv ntawm cov teeb meem ntawm kev cuam tshuam thiab kev diffraction ntawm lub teeb - diffraction grating , tom qab ntawd ua haujlwm rau cov teeb meem ntawm kev cuam tshuam thiab kev diffraction ntawm lub teeb.

1. Muaj ib daim ntaub thaiv qhov muag uas muaj 4000 kab txhua 1 cm uas nyob deb li 1 'meter' ntawm qhov uas ci ntsa iab. Xam qhov ntev ntawm lub teeb yog tias daim duab siab tshaj plaws thawj zaug yog 30 cm ntawm qhov uas ci ntsa iab.
Kev Sib Tham
Nws paub tias:
d = 1 / (4000 kab / cm) = 0,00025 cm = 2,5 x 10^-4 cm = 2,5 x 10^-6 m
l = 1 m
y = 30 cm = 0,3 m
Xav paub ntxiv: wavelength (lambda)

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