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Tóm tắt :
m = 1, 6 kg
V = 0, 0012 m3
a ) P = ? N
D = ? Kg / m3
b ) d = ? N / m3
Bài làm :
a ) Trọng lượng riêng của hòn đá là :
P = 10 . m = 10 . 1, 6 = 16 ( N )
Khối lượng riêng của hòn đá là :
D = m / V = 1, 6 / 0, 0012 = 4000 / 3 ( Kg / m3 )
b ) Trọng lượng riêng của hòn đá là :
d = 10 . D = 10 . 4000 / 3 = 40000 / 3 ( N / m3 )
Vậy : ...................................
1. Nhung's birthday is in the ninth of March. ->Nhung's birthday is on the ninth of March
2. We don't will have a part next Friday.-> We won't have a part next Friday.
3.Today is Thursday, the two of November.-> Today is Thursday, the second of November.
4.Hoang doesn't have a lots of friends in her new school. -> Hoang doesn't have a lot of friends in her new school.
1 . Nhung's birthday is in the nith of March. => ninth
2 . We don't will have a part next Friday. => has
3 . Today is Thursday,the two of November. => second
4 . Hoang doesn't have a lots of friends in her new school. => his
1.A.peaceful B.pleasure C.sleepy D.cheap
2.A.blossom B.chess C.messy D.passion
3.A.clothes B.fireworks C.scissors D.mountains
4.A.stadium B.place C.paddy D.lake
5.A.lunch B.music C.unpopular D.study
chúc bn học tốt
There are many sports in the world but I football best. I often play football
in the school yard when I have free time. The game needs 2 nets and a ball.
There are 22 players. The game lasts 90 minutes and two teams must play
against each other. The general rule is that the ball is kicked by leg and the
players get score when having the ball in their goal post. After 90 minutes, the
team who has more goal is the winner. If there is no winner, there will be an
extra half. I also watching football match on TV, too. It's very exciting and
interesting. I football very much because it helps me ralex after a hardworking day and makes me heathier.
1.goes-go
3.in-by
4.to play-playing
5.never are-are never
6.much-many
7.many-much
9.a-an
Học tốt
...
....................
1. goes -> go
2. Ko có
3. in -> by
4. Bỏ to
5. never are -> are never
6. much -> many
7. many -> much
8. good -> well
9. a -> an
10. a -> an
1. She needs a phone card to phone her parents in Hue.
..........Why does she need a phone card ?..............................................................................................................................
2. Yes. I have a brother and two sisters.
............Do you have a brother and two sisters ?............................................................................................................................
1.Why does she need a phone card
2.Do you have a brother and two sisters
#Học dốt#
1. He traveled to Nha Trang by coach .
=> How did he travel to Nha Trang ?
2. She went to the doctor because she was sick
=> Why did she go to the doctor ?
1. He travelled to Nha Trang by coach
=>How did he travel to nha trang?
2. She went to the doctor because she was sick
=>Why did she go to the doctor ?
1. My father usually goes to work by car.
2. It is a small house.
3. ??? (Từ gạch chân đâu bạn?)
4. ??? (Từ gạch chân đâu bạn?)
5. Minh and his friends are going to have a picnic near his lake.
Wish you good luck!!! =)
thể tích mà viên gạch chiếm là:
V = thể tích hòn gạch - 2 x thể tích mỗi lỗ = 816 cm3 = 816 x 10^-6 (m3)
=> khối lượng riêng của viên gạch là : D= m/V =1960 (kg/m3)
=> trọng lượng riêng cảu viên gạch là: d =10D =19600( N/m3)