he lo
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Đổi 50 g= 0,05 kg
Trọng lượng của vật 1 là:
\(P_1=10m_1=0,5\) (N)
Độ cứng của lò xo là:
\(k=\dfrac{F_{đh}}{\Delta l}=\dfrac{P_1}{\Delta l}=\dfrac{0,5}{0,01}=50\) (N/m)
Khi vật biến dạng 5 cm, tổng trọng lực tác dụng lên vật là:
\(P=k\Delta l'=2,5\) (N)
Trọng lượng của vật nặng đặt thêm là:
\(P_2=P-P_1=2,5-0,5=2\) (N)
Khối lượng của vật là:
\(m_2=\dfrac{P_2}{10}=0,2\) (kg) = 200 (g)
Đáp án D
1. drink => drinks
2. is -> was
3. comes => came
4. an => a
5. fluent => more fluently
6. has to => have to
7. although => because
8. was play => was playing
9. study => studying
10. to comment => comment
11. has -> have
12. come -> came
13. bought -> buy
14. going => go
15 have visited => last visited
1. He/ catch/ the train/ London/ tomorrow.
A. He will to catch the train to London tomorrow.
B. He catches the train to London tomorrow.
C. He will catch the train to London tomorrow.
D. He will catching the train London tomorrow.
2. Nathan/ late/ school/ he/ miss/ the bus
A. Nathan was late for school because he missed the bus.
B. Nathan wasn’t late for school because he missed the bus.
C. Nathan is late for school because he miss the bus.
D. Nathan was late to school because he missed the bus.
3. Food/ look/ delicious/ it/ taste/ horrible
A. Because the food looks delicious, it tastes horrible.
B. Although the food looks delicious, but it tastes horrible.
C. The food looks delicious, so it tastes horrible.
D. Although the food looks delicious, it tastes horrible.
4. Hoi An/ famous/ old buildings/ traditional crafts
A. Hoi An is famous for old buildings and traditional crafts.
B. Hoi An is famous on old buildings and traditional crafts.
C. Hoi An is famous about old buildings and traditional crafts.
D. Hoi An is famous of old buildings and traditional crafts.
5. If/ we/ use/ buses /we/ reduce/ pollution
A. If we use buses, so we will reduce pollution.
B. If we use buses, but we will reduce pollution.
C. If we use buses, we reduce pollution.
D. If we use buses, we will reduce pollution.
1) If I ___study__ (study), I ___will pass__ (pass) the exams.
2) If the sun ___shines__ (shine), we __will walk___ (walk) to the town.
3) If he ___has__ (have) a temperature, he __will see___ (see) the doctor.
4) If my friends ___come__ (come), I ___will be__ (be) very happy.
5) If she __earns___ (earn) a lot of money, she __will fly___ (fly) to New York.
6) If we ___travel__ ( travel) to London, we ___will visit__ (visit) the museums.
7) If you ___wear__ (wear) sandals in the mountains, you __will slip___ (slip) on the rocks.
8) If Rita __forgets___ (forget) her homework, the teacher __will give___ (give) her a low mark.
bài làm
Còn lá buồm thì cứ căng phồng như ngực người khổng lồ đẩy thuyền đi.
Các quan hệ từ : còn ; thì ; như
1 teach => teaching
2 enjoy => enjoys
3 will go => go
4 painting => collecting
5 importance => important
6 watering => water
7 what => how
8 for => to
9 at => bỏ
10 more => most
1. teach => teaching
2 .enjoy => enjoys
3 .will go => go
4 .painting => collecting
5 .importance => important
6 .watering => water
7 .what => how
8 .for => to
9 .at => bỏ
10. more => most
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