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Một người kéo 1 vật từ giếng sâu 14m lên đều trong 40s. Người ấy phải dùng 1 lực 160N. Tính công suất của người kéo theo đơn vị W, kW, MW
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Ex 1: Tick the correct sentences and correct the wrong ones. 1. There are three black dogs in the park. _______________________________ 2. There is six books on my desk. _______________________________ 3. Da Lat is a city beautiful. _______________________________ 4. There is two good actors in the film. _______________________________ 5. Are there two new DVDs in your schoolbag? ___________________________ Ex 2: Write the conversations using the words below 0. a new pencil case in your bag / old Giang: Is there a new pencil case in your bag? Huyen: No, there isn’t. There’s an old pencil case. 1. five DVDs on the table / three. Hien: ______________________________________________ Hai: _______________________________________________ 2. a man in the garden / a woman Hien: ______________________________________________ Hai: _______________________________________________ 3. six books in that bag / seven Hien: ______________________________________________ Hai: _______________________________________________ 4. lots of cars in the street / one car Hien: ______________________________________________ Hai: _______________________________________________ 5. thirty students in your class / thirty one Hien: ______________________________________________ Hai: _______________________________________________

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