user-avatar
vanhtrinh1811
2 năm trước
một xe có khối lượng bằng 200 kg chuyển động đều với vận tốc là 18 km trên giờ trên con dốc dài 200 m cao 10 m. động cơ có công suất là 0,75 KW. Tính công của lực ma sát và giá trị của lực ma sát
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Exercise 7. Read the passage and answer the following sentences. On Wednesday evening, we went to the Town Hall. It was the last day of the year and a large crowd of people had gathered under the Town Hall clock. It would strike twelve in twenty minutes' time. Fifteen minutes passed and then, at five to twelve, the clock stopped. The big minute hand did not move. We waited and waited, but nothing happened. Suddenly, someone shouted “It's two minutes past twelve! The clock has stopped!” I looked at my watch. It was true. The big clock refused to welcome the New Year. At that moment, everybody began to laugh and sing. Notes: - strike (v): đánh, đập, điểm - minute hand (n): cây kim phút - suddenly (adv): đột nhiên - refuse (v): từ chối * Questions: 1. Where did they go on Wednesday evening? ->………………………………………………………………………………………………… 2. Was it the first day of the year? ->………………………………………………………………………………………………… 3. What time did the clock stop? ->………………………………………………………………………………………………… 4. Did the big minute hand move? ->………………………………………………………………………………………………… 5. What did everyone begin to do at that moment? ->…………………………………………………………………………………………………

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team