một vật đặt trên mặt bàn nằm ngang Vật Bị tác dụng bởi một lực kéo theo phương nằm ngang chiều từ trái sang phải và có cường độ bằng 6n biểu diễn lực kéo trên bằng vectơ với tỉ xích 1cm ứng với 2n

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DERIVATIVES or WORD FORMATION Ex1: 41:Send the letter by .......... if you want it to reach the recipient in time (AIR) 42:The ...........in the area are against the building of the expressway (RESIDE) 43:Come to stay at our hotel we are sure to give the greatest ..........and good service (COMFORTABLE) 44:The supermarket is offering a wide ..........of spring clothes for you yo choose from (SELECT) 45:Rice cooked in clay pot is one of the ........in this restaurant (SPECIAL) 46:I want to become a press ............when I grow up (PHOTOGRAPH) 47: Hoa brought a dictionary in her .........for the E nghlish lesson (PACK) 48:As soon as my younger brother could tell the time ,he was given ..........(WRIST) 49:Television is one of the cheapest form of ............(ENTERTAIN) 50: I prefer the ........... village to the noisy city (PEACE) 51: Some of my .............are living in the countryside (RELATION) 52:My father plans to live............in the countryside after he retires (PERMANENT) 53:Read the user's manual carefully ,it will give you a lot of useful .............(INFORM) 54:This part of the library is for college students only it is not ..........to high school pupils (ACCESS) 55:I didn't sleep very well that night and got a terrible headache the ..........morning (FOLLOW) 56:Few people want to eat that restaurant because of the ..... smell from the garbage dump nearby (PLEASE) 57:Our ........are doing their best to improve the people 's quality of life (GOVERN) 58:What's the ..........time of your flight? (DEPART) 59:I'm going to buy a motorcycle .I'm tired of riding on ..........bese (CROWD) 60:English is an ..........and impoetant subject (INTEREST ) 61:The most popular after school ..........in our country is soccer (ACT) 62:Today we have literature ,.............education and hictory (PHYSICS) 63:The library in our city has over 50 ............(EMPLOY)

DERIVATIVES or WORD FORMATION Ex1: 21:We enjoy listening to some .......folk songs when we were in Hue (TRADITION) 22:The old man was highly respected for his .............(WISE) 23:My sister was very ...........when her cat was run over by a car (SET) 24:There was great ..........in the cuty when the team won the Football cup (EXCITED) 25:There should be a law to prevent ..........to anmals (CRUEL) 26: His ...........at the party embarrassed everyone (BEHAVE) 27: Our project wouldn't be successful without you kind ..............(COOPERATE) 28: ..........in the sports competition is open to everyone regardless of age and ***** (PARTICIPATE) 29 :Our English lessons always begin with a .........drill of the new words (PRONOUNCE) 30:On the whole the hotel provide .........service (SATISFY) 31:Read through the passage and ........any words you don't understand (LINE) 32: You don't have to .............the grammar rules to be able to do these exercises (MEMORY) 33:Remember to check for ...........mistakes before hading in your composition (SPELL) 34:If you want to join the club ,please fill in this .............(APPLY) 35:Do you happen to know what summer .......our school are going to arganize?(ACTIVE) 36:I think ...........games are good for our health (DOOR) 37:One of the aims o the International Scout Association is to encourage good .............(CITIZEN) 38:Madonna's latest album can be found in music shops .............(WORLD) 39:Pedestrians shuold walk on the ..........,not in the street (WALK) 40:Tom failed to be admitted to the university because of his poor ............achiveements (ACADEMY)