Trong 30 phút, công sinh ra là:

\(A=A_1.30=960.30=28800\left(kW\right)=28800000\left(W\right)\)

Quãng đường xe đi trong 30 phút:

\(s=\frac{A}{F}=\frac{28800000}{1600}=18000\left(m\right)=18\left(km\right)\)

Chuyển đổi câu dưới đây sang dạng bị động:

1) A famous singer will perform her songs

.......A famous singer's song will be performed by her........

2) His parents won't take him to school

..........He won't be taken to school by his parents.........

3) My sister will meet you at the airport

.........I will be met by my sister at the airport........

4) I won't buy your glasses

......Your glasses won't be bought by me.....

5) He will write a new book for children

.......A new book will be written for children by him........

6) We will plant more trees to reduce the carbon dioxide in the atmosphere

.....More trees will be planted by us to reduce the carbon dioxide in the atmosphere.......

I . Change these sentences into passive :

They built that house five years ago

....That house was built five years ago......

She bought a lot of flowers for her mother

....A lot of flowers were bought for her mother......

The children eat all the vegetables and meat

....All the vegetables and meat are eaten by the children.....

Lien didn ' t finish her homework .

...Her homework wasn't finished.......

Ba can fix his bike by himself .

...His bike can be fixed by Ba by himself.......

He wrote these books for the children .

....These books were written for children.....

People use this cloth bag again and again .

....This cloth bag is used again and again....

You don ' t prepare your lesson before you go to school .

....Your lesson wassn't prepared before you go to school......

Ha Long Bay attracts a lot of tourists

. ...A lot of tourists are attracted by Ha Long Bay......

Thu has seen that movie twice

.....That movie has been seen by Thu twice....