Bài 1: Biểu diễn các lực sau:
a) Lực kéo vật có cường độ bằng 10000N, theo phương nằm ngang, chiều từ phải sang trái ( tỉ xích 1cm ứng với 5000N)
b) Trọng lực của vật có khối lượng 3kg, tỉ xích 1cm ứng với 10N
Bài 2: Lúc 7h, 2 ô tô cùng khởi hành từ 2 điểm A, B cách nhau 100km đi ngược chiều nhau. Vận tốc xe đi từ A là 10m/s, vận tốc xe đi từ B là 44km/h
a) Tính khoảng cách của 2 xe lúc 8h
b) Xác định thời điểm và vị trí của 2 xe gặp nhau
Bài 3: Một xe máy đi từ A đến B với vận tốc trung bình = 40km/h. Biết nửa quãng đường đầu đi với v1 không đổi, vận tốc của xe ở nửa quãng đường còn lại là 30km/h. Tính v1?
I, Rewrite each of the following sentences so that it means the same as the first one, beginning with the given words.
1. "You shouldn't lend him any more money" Mrs. Tuyet said to Nga.
=> Mrs. Tuyet advised________________________________.
2. Though the weather was very bad, my class went camping.
=> In spite of_______________________________________.
3. It was so late that nothing could be done.
=> It was too_______________________________________.
4. Is this the best price you can offer?
=> Can't you_____________________________________.
5. I don't go to church every Sunday any longer.
=> I used to____________________________________.
6. I sent my friend a letter in London last week.
=> A letter________________________________________.
7. I last saw him when I was a student.
=> I haven't_________________________________________.
8. "Don't forget to bring your passports with you when you go aboard."
=> She reminded_____________________________________.
9. Smoking is not allowed in the ward.
=> Would you____________________________?
10. He failed the exam because of his laziness.
=> Beacause he____________________________________.
II, Use the given word to write the second sentence in such a way that it is as similar as possible in meaning to the original sentence. Do not change the form of the given word.
1. I wanted to finish my homework, so I stayed up late last night. (as)
=> I stayed_______________________________________________.
2. The thick fog prevented me from driving to work. (made)
=> The thick fog_____________________________________________.
3. Nick hasn't been to Vietnam before. (time)
=> This is____________________________________________________.
4. Mr. Lam teaches English. Mr. Hai teaches Math. (subject)
=> Mr. Lam doesn't____________________________________________.
5. I'd rather not see him tomorrow. (want)
=> I___________________________________________________________.
III, Use the given suggestions to complete sentences.
1. Instead/ reuse/ plastic bags/ we/ use/ cloth bags.
=>_________________________________________________________________.
2. Will/ you/ have/ look/ house/ me/ while/ I/ be/ holiday?
=>_________________________________________________________________?
3. We/ hope/ give/ more/ green/ color/ town/ and/ earn/ money/ group.
=>_________________________________________________________________.
4. "Frends of the Earth"/ be/ organization/ protect/ planet.
=>_______________________________________________________________.
5. It/ brave/ him/ jump/ river/ save/ child.
=>____________________________________________________________________.