Hai điện tích bằng nhau bằng 2.10mũ trừ 7 C đặt cách nhau 0.06m trong chân không thì tác dụng nhau một lực bằng ?

Hai điện tích điểm có độ lớn điện tích bằng nhau , đặt cách nhau 5cm trong chân không thì tác dụng lên nhau 1 lực là 36.10mũ trừ 2 N . Điện tích 2 quả cầu đó là ?

Hai điện tích dương bằng nhau đặt cách nhau 2cm trong chân không thì tác dụng nhau một lực 1,6.10trừ4 . Độ lớn của mỗi điện tích là ??

Hai điện tích trái dấu q và -q có cùng độ lớn 10 trừ 6 C đặt tại hai điểm cách A và B 6cm. Một điện tích dương q1=q đặt trên đường trung trựa AB đoạn 4cm. Tính lực tương tác lên q1

Cho các chất sau : kcl nóng chảy , nước nguyên chất , ancol etylic khan , Cacl2 rắn khan , dd HBr . Có bao nhiêu chất điện li ?

II. Choose the odd one out , then read the rest of the words aloud.

1. A. request B. arrest C. honest D. invest

2. A. accurate B. accelerate C. abbreviate D. activate

3 A. best B. conquest C. chest D. dearest

4. A. development B. indent C. establishment D. employment

5. A penetrate B.accommodate C. appropriate D. administrate

6. A replacement B. measurement C. comment D. government

I. fill in the blank with suitable form of verbs:

a, He hopes ......./pass/ his next exam.

b, He suggested.......... /hotd/ another meeting.

c, You'll have to wait until the stops....../talk/.

d, I try ......./ not make/ the same mistake again.

e, Would you like....../have/ the next dance with me ?

g, He's expecting......../make/ a trip to HLB.

h, Does the city government intend ....... /do/ anything about pollution ?

V. Choose the best answer to complete each sentences.

1. The man wanted to avoid ...... on security cameras.

a,to see b,seeing c, to be seen d, being seen

2. John had agreed......... me in his office.

a, to meet b,meeting c, to be meet d, beeing met

3. Peter decided ........ in for the exam.

a, go b. going c, to go d, to be gone

4. The plants wants ..... daily.

a, to water b, watering c, to be watered d, B và C

5. I tried ..... the bus , but I missted it.

a, to catch b, catching c, to be caught d, being caught

6. Will you remind me ....... this letter at the post office ?

a, being posted b, to post c, posting d, to be posted

7. I remember ..... my book on the table , but it is nowhere to be seen.

a, to put b, put c, putting d, being put.

8. Remember ....... of the lights bofore you leave.

a, to turn b, turn c, turning d, being turned.

9. I remember ...... the Queen in London.

a, meet b, to meet c, meeting d, to meeting.

10. A thief wanted to avoid ......... by the police.

a, to catch b, catching c, being caught d, to be caught

11. Shy peoply often find it diffcult to ............. group discussions.

a, get on with b, take place c, take part in d. get in

12. Lan promises ....... that book to me tomorrow.

a, to give b, give c, giving d, gave

IV. Rewrite the sentences.

a, I would like to go to the cinema tonight.

=> I feel like ...........................................

b, Susan said to me : '' You should Study hard ''

=>Susan advised me ........................................

c,'' you can you the laptop '' . my mother said

=> My mother allowed me..........................

d, It's difficult for me not to laugh at him.

=> I can't help.......................................

e, Jack can solve the problem.

=> Jack is capable of ............................

I, Fill in the blanks with suitable form of verbs :

a, He hopes ........ /pass/ his next exam.

b, He suggested ........../hold/ another meeting.

c, You'll have to wait until he stops ......../talk/.

d, I try ......../not have/ the same mistake again.

e, Would you mind ........./buy/ me a newspaper ?

f, Would you like..... /have/ the next dance with me ?

g, He 's expecting ....... /make/ a trip to Ha Long Bay.

h, Does the city government intend ..... /do/ anything about pollution.

i, I forgot........../close/ the window last ninght.

j, Don't forget ..... /post/ this letter.

k, You'll have to wait until he stops ....../talk/.

l, I was tired . So I stopped...... /have/ a rest.

p, Doctors adsive ........ /eat/ less meat.

q, Minh permitted me ....... /use/ his computer.

r. Police didn't permit ........ /enter/ this area.

Ai biết làm hộ mình zới ....Tks