Câu 1. Một tên lửa khối lượng 10000kg đang bay thẳng đứng lên trên với vận tốc 100m/s thì phụt ra sau trong thời gian rất ngắn một lượng khí có khối lượng 2000kg với vận tốc 8000m/s. Tính vận tốc của tên lửa ngay sau khi phụt khí ( định luật bảo toàn cơ năng)

Câu 1. Một tên lửa khối lượng 10000kg đang bay thẳng đứng lên trên với vận tốc 100m/s thì phụt ra sau trong thời gian rất ngắn một lượng khí có khối lượng 2000kg với vận tốc 8000m/s. Tính vận tốc của tên lửa ngay sau khi phụt khí

Câu 1. Một tên lửa khối lượng 10000kg đang bay thẳng đứng lên trên với vận tốc 100m/s thì phụt ra sau trong thời gian rất ngắn một lượng khí có khối lượng 2000kg với vận tốc 8000m/s. Tính vận tốc của tên lửa ngay sau khi phụt khí ( bài cơ năng)

Exercise 5. Fill in each blank with an article if necessary:

1. I want __ __ apple from that basket.

2. __ __ church in the corner is progressive.

3. Miss Lin speaks __ __ Chinese.

4. I borrowed __ __ pencil from your pile of pencils and pens.

5. One of the students said, "__ __ professor is late today."

6. Eli likes to play _ __ volleyball.

7. I bought __ __ umbrella to go out in the rain.

8. My daughter is learning to play __ __ violin at her school.

9. Please give me __ __ cake that is on the counter.

10. Albany is the capital of _ __ New York State.

11. ___ _ apple a day keeps the doctor away.

12. Our neighbors have ___ _ cat and __ __ dog.

13. I want __ ____ new printer for Christmas.

14.  Excuse me. Have you got ___ ___ time?

15.  It was ___ ___ exciting movie.

16.  I was four the first time I saw ___ ___ elephant.

17.  It's such ___ ___ nice day that I think I'll go and read my book in the park.

18.  My students like to do their activity books lying on ___ ___ floor

19.  I saw ___ ___ eagle hovering high above the valley.

20.  ___ ___ huge ape ran out of the forest and stole my picnic hamper.

Câu 2.Một vật có khối lượng 0,2 kg được phóng thẳng đứng từmặt đất với vận tốc 10m/s.Lấy g=10m/s2.Bỏqua sức cản. Hỏi khi vật đi được quãng đường 8m thì động năng của vật có giá trịbằng bao nhiêu? (giải bằng định lí động năng)

Câu 2.Một vật có khối lượng 0,2 kg được phóng thẳng đứng từmặt đất với vận tốc 10m/s.Lấy g=10m/s2.Bỏqua sức cản. Hỏi khi vật đi được quãng đường 8m thì động năng của vật có giá trịbằng bao nhiêu?

Exercise 3. Complete the sentences with the comparative and superlative of the adjectives in brackets

1.      My brother has a (tidy)  _______________room than me.

2.      Australia is (big)  _______________than England.

3.      I'm (good)  _______________ now than yesterday.

4.      She's got (little)  _______________ money than you, but she doesn't care.

5.      He thinks Chinese is (difficult)  _______________ language in the world

6.      Valencia played (bad)  _______________ than Real Madrid yesterday.

7.      Cats are not (intelligent)  _______________ as dogs.

8.      Show me (good)  _______________ restaurant downtown.

9.      (hot)  _______________ desert of all is the Sahara and it's in Africa.

10.      Who is (talkative) _______________ person in your family?

Exercise 2. Are the following sentences right (V) or wrong (x)? Mark them with (V ) or (x) and correct the mistakes.

1. Syrups are gooder than pills in treating a sore throat.___________________

2. Ointments are the most effective medicines for bruises. __________________

3. Inhalers are best for breathing problems. __________________

4. My Latin class is more boring than my English class.______ _______________

5. In the UK, the streets are generally more narrow than in the USA._________________

6. London is more busier than Glasgow . ___________________

7. My garden is a lot colourful than this park. __________________

8. Yesterday the weather was much more nicer than it is today. ___________________

9. Amanda is the most ambitious than her classmates. ____________________

10. This is the most interesting type of recreation. __________________________

Exercise 1. Complete the sentences with the comparative and superlative of the adjectives in brackets.

1. A cut is _________________________ (painful) than an insect bite.

2. The weather this summer is even (bad) __________________________ than last summer.

3. Apartments are usually _________________________ (cheap) than separate houses.

4. A tumour is _________________________ (bad) of all diseases.

5. He was the (clever) _____________________ thief of all.

6. A man is normally___________________________ (strong) than a woman.

7. This flower is (beautiful) _____________________ than that one.

8. This is the (interesting) _______________________ book I have ever read.

9. Fruit and vegetables are ____________________________ (healthy) than fast food.

10. Fish is one of ___________________________ (nutritious) food possible.

11. Non-smokers usually live (long) _____________________ than smokers.

12. Which is the (dangerous) ___________________ animal in the world

Exercise 2. Give the correct form of the given words to complete the following sentences:

1. Susan believes in ghosts and the world for the dead. She is so ___________. (SUPERSTITION)

2. Their ________ of the plan caused the experiment to be abandoned. (APPROVE)

3. He is so ___________ that he had an accident. (CARE)

4. Many women nowadays often seek financial _____________by going out to work. (DEPEND)

5. All the guests got dressed in ___________ costume. (NATION)

6. Boys and girls may behave ___________ in this situation. (DIFFERENCE)

7. The 23^rd mascot eagle is the ___________ of elegance, strength and pride. (SYMBOLIZE)

8. Claulfied claimed they had _________ against him because of his nationality. (DISCRIMINATION)

9. There is no evidence of his direct __________ in the bombing. (INVOLVE)

10. The exact origin of the universe remains a ____________. (MYSTERIOUS)