9 Piv txwv ntawm Cov Lus Nug Txog Lub Dav Hlau Inclined
Kawm cov ntaub ntawv hais txog Newton txoj cai , lub zog ib txwm muaj thiab lub zog sib txhuam kom nkag siab zoo dua txog kev sib tham ntawm lo lus nug no.
1. Ib lub thaiv 5 kg raug tso tawm rau ntawm ib lub dav hlau du raws li pom hauv daim duab! (g = 10 ms −2 thiab tg 37 o = 3/4). Qhov kev nrawm ntawm lub thaiv yog...
A. 4,5 ms-2
B. 6,0 ms −2
C. 7,5 ms −2
D. 8,0 ms −2
E. 10,0 ms −2
Kev Sib Tham
1. Lub thaiv A uas hnyav 5 kg muab tso rau ntawm ib qho chaw tiaj tiaj, lub thaiv B uas hnyav 3 kg muab dai nrog ib txoj hlua thiab txuas rau lub thaiv A ntawm lub pulley, yog tias g = 10 m/s 2 txiav txim siab qhov kev nrawm ntawm lub thaiv!
A. 3,50 m/s2
B. 3,75 m/s 2
C. 4,00 m/s 2
D. 5,00 m/s 2
E. 5,25 m/s 2
Kev Sib Tham
1. Yog tias lub zog uas ua rau ib yam khoom sib npaug rau xoom, ces...
(1) tus khoom yuav tsis nrawm dua
(2) tej yam khoom yeej ib txwm so
(3) qhov kev hloov pauv ntawm qhov ceev ntawm yam khoom yog xoom
(4) nws tsis yooj yim sua rau ib yam khoom txav mus rau hauv ib txoj kab ncaj nraim ntawm qhov ceev tas li
Qhov tseeb yog ...
4 Piv txwv ntawm Cov Lus Nug Txog Lub Zog Centripetal
1. Ib yam khoom uas muaj qhov hnyav li 200 grams raug khi rau ntawm txoj hlua sib zog thiab tom qab ntawd tig kab rov tav nrog lub zog ntawm lub kaum sab xis tas li ntawm 5 rad s -1 , raws li pom hauv daim duab hauv qab no. Yog tias qhov ntev ntawm txoj hlua yog l = 60 cm, ces qhov loj ntawm lub zog centripetal ua rau ntawm yam khoom yog ...
A. 0,3 N
B. 0,6 N
C. 3 N
D. 6 N
Sab Hnub Tuaj 30 N
Kev Sib Tham
1. Ib lub mos txwv raug tua nrog qhov ceev ntawm 20 ms –1 . Yog tias lub kaum sab xis yog 60 o thiab qhov kev nrawm vim lub ntiajteb txawj nqus = 10 ms –2 , ces lub mos txwv mus txog nws qhov chaw siab tshaj plaws tom qab…
A. 1 vib nas this
B. 2 vib nas this
C. √3 vib nas this
D. 2√3 vib nas this
E. 3√2 vib nas this
Kev Sib Tham
1. Ib yam khoom uas muaj qhov hnyav li 10 kg yogkev txav mus los ib puag ncig ntawm qhov ceev ntawm 4 ms-1Yog tias lub vojvoog ntawm lub vojvoog yog 0,5 meters, ces:
(1) Lub zaus tig yog 4/π Hz
(2) Kev nrawm ntawm centripetalnws 32 ms-2
(3) Lub zog centripetal yog 320 N
(4) Lub sijhawm yog 4π s.
Cov lus tseeb yog...
1. (1), (2), (3), thiab (4)
2. (1), (2), thiab (3)
3. (1), thiab (3) xwb
4. (2), thiab (4) xwb
5. (3), thiab (4) xwb
Kev Sib Tham
1. Ob lub log A thiab B txuas nrog ib daim kab xev (saib daim duab). Yog tias lub vojvoog ntawm A yog ob npaug ntawm lub vojvoog ntawm B, ces qhov tshwm sim yog...
A. vA = 2 vB
B. vA = 1/2 vB
C. vA = vB
D. ωA = ωB
E. ωA = 2 ωB
Kev Sib Tham
1. Los ntawm daim duab saum toj no, qhov uas qhia txog ib yam khoom uas so yog...
A. (1)
B. (2)
C. (3)
D. (4)
E. (5)
Kev Sib Tham
Ib yam khoom uas so yog qhia los ntawm ib txoj kab kab rov tav perpendicular rau qhov deb axis (s). Txoj kab ncaj no qhia tias qhov deb tseem ruaj khov thaum lub sijhawm nce ntxiv.
Cov lus teb yog C.
1. Txhua tag kis, Hadi ib txwm khiav ib ncig ntawm ib daim teb uas ntsuas 100 m x 400 m 12 zaug hauv 1 teev. Qhov nruab nrab ceev thiab qhov nruab nrab ntawm Hadi txoj kev txav mus los yog ...
A. 0 km/teev thiab 12 km/teev
B. 0 km/teev thiab 6 km/teev
C. 6 km/teev thiab 12 km/teev
D. 6 km/teev thiab 6 km/teev
E. 12 km/teev thiab 12 km/teev
Kev Sib Tham
1. Fitria taug kev raws nws cov kauj ruam pib ntawm qhov chaw A mus rau qhov chaw B: 600 m sab qaum teb; mus rau qhov chaw C 400 m sab hnub poob; mus rau qhov chaw D 200 m sab qab teb; thiab tom qab ntawd xaus rau ntawm qhov chaw E 700 m sab hnub tuaj. Qhov loj ntawm kev hloov chaw uas Fitria tau ntsib yog….
A. 100 m
B. 300 m
C. 500 m
D. 1500 m
E. 1900 m
Kev Sib Tham