A. Ai2= - WO B. Al2 = Wa C. Au= Wit + Wt2 D. A 12

(1)

TRU'dNG DAI HQC VAN LANG KHOA KHOA HQC Ca BAN

thi: De 1: dl De 2:

0

Mon thi: Vet Kr di arcing I

Khoa/Larp: K25 - Hoc ki/: 1 - Nam hoc: 2019-2020 Thai gian thi: 45 phut 60 phut 75 phut 90 phut 120 phut 0

0; th; 0; 0;

Hinh that thi: Tv luen LI Trec nghiem 0 Tv luen + Trac nghiem Dvoc sir dung tei lieu 0 - Kh6ng sir dung tai lieu Ea

Nguti bran son (Kiva g^{h rö he?}ten)

Trutg Kh a/Be m n Iêt (Kiva gin ^{re ho}ten)

I. Tric

(Willem (3d)

Cau 1. COng Au la Gong dich chuyen tir vi tri 1 den vi tri 2 trong truemg lgc the. MI va wa la the nang tai hai vi tn. Dinh 19 ve the nang la bieu thirc nao sau day?

A. Ai2= - WO B. Al2 = Wa C. Au= Wit + Wt2 D. A 12

^=I

Wit Wal flu 2. Tha vat m = 200g trugt khong ma sat theo mang nghieng goc a = 30 0 so yeti phuang ngang. Lay g= 10m1s2 DO bien thien dOng nang elm vat khi no trugt xueng dirge mOt doan s = 2m la:

A. 200J B. 400J C. 2J D. 4J

flu 3. Phat bieu nao sau day la.SAI?

Trong tg nhien ton,tai hai loai dien tich: duang va am.

Dien tich nguyen to la dien tich c6 gia tri nh6 nhat.

Dien tich chira trong mOt chat diem la mOt then tich diem.

Hai vat kim loai mang dien duang va am bat ki ma cham nhau thi së tree( thanh hai vat trung hoa ye dien.

Can

4: Lire tuang the gitra 2 dien tich diem se thay dth the nao nu ta cho di) Mn cüa mth dien tich diem do tang gap din, 'Ming thai khoang each gita chling cling tang gap doi?

A) Tang gap, Mi. B) Giam mOt nth.

C) Kh8ng Mi. D) Tang gap 4 lan.

flu 5. Deng dien I chay tren doan day din tiling AB nhu hinh 6.1. COng thirc nao sau day tinh cuang dO tir twang do dong dien nay gay ra ti diem M?

—(cos0 - case 2 )

A I B

II =

—(cos0,-cos0 2 ) /

---401

h

/

P

, J./

e.

.92

H

= 2ich

H - (cosi - cost)

47ch rvi

H - (cos() + cos%)

^{Hinh 6.1}

2.7ch

flu 6. Mot khung day tren ban kinh 10cm, dat trong kh8ng khi, tren do quan 100 vong day nth. Cuemg do clang dien qua moi yang day la 1A. Cueing clO tit twang tai tam khung day la:

A) 6,28.10 -4A/m B) 500A/m C) 5Alm D) 2.10 -4A/m

1

(2)

Do lem luc tuang tac gitra hai dien tich diem:

F - klq1421 ₁₂ _{r 2}

Cueing do dien trucmg do then tich diem gay ra:

F lql qo r 2

Cam ung dien twang: b =EE,E Ceng cUa lye di'en: = go Di'en the: V = , Cam ling tir true:mg

Do day clan thang dai gay ra:

B = IA j i' .(cos 0, ^{COS 02} 4n.a

Do yang day gay ra ti tam 0:

0 y

a N101

3600 2R

Cuemg dO tir trueng: ,

NA,

k =9.109 Nm2 c2; = 47c.10-7 H in Clang:

A = Es. cos a Clang suat:

A - Dinh Iy dOng nang:

Aufil =Wdiv —Wax, , Dinh1y the nang:

Abriv =

Dinh luat bao toan ca nang:

W = Wd = const , Dinh luat bao toan nang

AMY =-W N -Wm , Dung nang:

W,/ = 1 —MV 2 1

2

lin2 , - 2

The nang:

= mgY

Cong hao phi do ma sat:

A,,,,„ P s.mni = F.MN.cos180° =-F.MN H.

Bei tap (76).

Bei 17 (26).

Tha met vt c6 khoi, lugng 2kg truut vói van Vic dau 5m/s tit dinh mat plan nghieng dai I0m, DSc nghieng 300 so vai phuang ngang. BO qua ma sat

0 giirra vat va mat phang nghieng: lay g= 10m/s2, tinh:

Van toe vat a chan mat ph-an nghieng.

Sau Ichi trugt het mat phang nghieng, vat trugt tren mat phang ngang có h'e soma sat 0,3. Tim quang duang vat trugt ten mat phang ngang d6.

Bei 2 (34).

Dat Mn lucrt hai dien tich qi = 4.104C, '72,-- -2.164C tai hai diem Al, N film hinh ye, trong do MN= 10cm, A Wain tren throng trung true dm MN va each MN met don HA = 5cm, dat trong kitting khi. Xac dinh •

Cong dich chuyen dien tich qo = -104C tit H den A.

Vector cueing dO dien trubng tai A.

Tai P thuOc duang thang NM, dat dien tich, q3 sao cho dien truang tai A Ific nay bang Ichong. Xac dinh diem P va dien tich q3.

Bei 3 (26).

Mot day dan dai vo han c6 dong dien 30A chay qua dugc u6n thanh goc x0y = 150° nhu hinh ve. Tim \recta cam ling tit twang tai diem M nam tren du:cmg phan giac g6c Tny hi4t OM= 9 m

2